{"Name":"AHDC1-related intellectual disability - obstructive sleep apnea - mild dysmorphism syndrome","DiseaseID__c":"GARD:0013409","id":13409,"encodedName":"ahdc1-related-intellectual-disability-obstructive-sleep-apnea-mild-dysmorphism-syndrome","IsDeleted":false,"Disease_Name_Full__c":"AHDC1-related intellectual disability - obstructive sleep apnea - mild dysmorphism syndrome","Xref_IDs__c":"C192092; C4014419; DOID:0070055; MEDGEN:862856; MONDO:0014358; OMIM:615829; ORPHA:412069","USA_Estimate__c":"1,000","No_of_Specialist_Tagsa__c":4,"No_of_ClinGen_records__c":0,"No_of_GeneReviews__c":0,"No_of_HHS_records__c":1,"World_Estimate__c":"1 to 8,000","No_of_HRSA_records__c":0,"Evidence_Based_Score__c":1,"No_of_Disease_Descriptions__c":4,"Disease_Characteristics_Score__c":7,"No_of_Age_at_Onset__c":1,"Description_Source__c":"GARD:0013409","Disease_Description__c":"Xia-Gibbs syndrome is a rare disorder of intellectual disability. People with this syndrome usually present with developmental delay (especially delays in speech), low muscule tone (hypotonia), failure to thrive, mildly unusual facial features (broad forehead, widely-spaced eyes (hypertelorism), big and low-set ears, flat nasal bridge, and thin upper lip), and breathing difficulties when sleeping (sleep apnea). The sleep apnea may be due to a collapse of the airway when breathing (tracheomalacia). Other signs and symptoms may include autistic features, seizures, lack of coordination (ataxia), behavioral problems, crossed-eyes (strabismus), and an abnormal lateral curvature of the spine (scoliosis). Males usually have more severe symptoms than females. Brain MRI may show several structural brain defects, such as thinning of the corpus callosum and posterior fossa cysts. Xia-Gibbs syndrome is caused by variants in the AHDC1 gene. Inheritance is autosomal dominant but all reported cases to date have been due to new genetic changes (de novo), in individuals with no family history.","GARD_Name__c":"AHDC1-related intellectual disability - obstructive sleep apnea - mild dysmorphism syndrome","GARD_Synonym__c":"ahdc1-related intellectual disability-obstructive sleep apnea-mild dysmorphism syndrome; ahdc1-related intellectual disability, obstructive sleep apnea, mild dysmorphism syndrome; at-hook dna binding motif containing 1-related intellectual disability, obstructive sleep apnea, mild dysmorphism syndrome; autosomal dominant intellectual disability 25; mrd25; xia gibbs syndrome; xia-gibbs syndrome","Curated_Disease_Description_Source__c":"PlainLanguagePilotV1-Sep23","Curated_Disease_Description__c":"Xia-Gibbs syndrome is a neurological disorder characterized by weak muscle tone (hypotonia), mild to severe intellectual disability and delayed development. Expressive language skills (vocabulary and the production of speech) are particularly affected; children with this condition usually do not speak their first word, a milestone typically achieved within the first year, until age two or later, and some never learn to talk. Development of motor skills, such as crawling and walking, can also be delayed. Other signs and symptoms of Xia-Gibbs syndrome vary among affected individuals. Additional neurological features include poor coordination and balance (ataxia) and seizures. Feeding problems and sleep abnormalities can also occur in people with the condition, and many affected individuals experience short pauses in breathing while they sleep (obstructive sleep apnea). In some people with Xia-Gibbs syndrome, imaging tests of the brain show abnormalities in the brain's structure. For example, the tissue connecting the left and right halves of the brain (the corpus callosum) can be abnormally thin. Xia-Gibbs syndrome can also affect physical development. Growth is usually impaired, and many affected individuals are shorter than their peers. Side-to-side curvature of the spine (scoliosis) is also a common feature. Some people with Xia-Gibbs syndrome have unusual facial features, such as a broad forehead, low-set ears or ears that stick out, widely spaced eyes (hypertelorism), eye openings that slant up or down (upslanting palpebral fissures or downslanting palpebral fissures), a flat bridge of the nose, or a thin upper lip. Other, less-common abnormalities involving the bones and skin include premature fusion of certain skull bones (craniosynostosis), unusually loose (lax) joints, and loose skin. Neurodevelopmental disorders can also occur in Xia-Gibbs syndrome. Some affected individuals have  autism spectrum disorder, which is characterized by impaired communication and social interactions, or attention-deficit/hyperactivity disorder (ADHD). Other problems can include aggression, anxiety, poor impulse control, and self-injury.","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":"1,000","Age_at_Onset_Snippet_Text__c":"as a Newborn","SourceID__c":"ORPHA:412069","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0014358","ORPHANET_ID__c":"ORPHA:412069","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Síndrome de discapacidad intelectual-apnea obstructiva del sueño-dismorfia leve asociado a ahdc1","Spanish_Description_Source__c":null,"Spanish_Description__c":null,"Spanish_Disease_Name__c":"síndrome de discapacidad intelectual-apnea obstructiva del sueño-dismorfia leve asociado a ahdc1","Spanish_GARD_Synonym__c":"síndrome de xia-gibbs","Category_Linearization__c":"ORPHA:98006","icd10_id__c":null,"mesh_id__c":null,"omim_id__c":null,"snomed_id__c":null,"umls_id__c":null,"GARD_Disease__c":[{"Curated_Disease_Description__c":"Xia-Gibbs syndrome is a neurological disorder characterized by weak muscle tone (hypotonia), mild to severe intellectual disability and delayed development. Expressive language skills (vocabulary and the production of speech) are particularly affected; children with this condition usually do not speak their first word, a milestone typically achieved within the first year, until age two or later, and some never learn to talk. Development of motor skills, such as crawling and walking, can also be delayed. Other signs and symptoms of Xia-Gibbs syndrome vary among affected individuals. Additional neurological features include poor coordination and balance (ataxia) and seizures. Feeding problems and sleep abnormalities can also occur in people with the condition, and many affected individuals experience short pauses in breathing while they sleep (obstructive sleep apnea). In some people with Xia-Gibbs syndrome, imaging tests of the brain show abnormalities in the brain's structure. For example, the tissue connecting the left and right halves of the brain (the corpus callosum) can be abnormally thin. Xia-Gibbs syndrome can also affect physical development. Growth is usually impaired, and many affected individuals are shorter than their peers. Side-to-side curvature of the spine (scoliosis) is also a common feature. Some people with Xia-Gibbs syndrome have unusual facial features, such as a broad forehead, low-set ears or ears that stick out, widely spaced eyes (hypertelorism), eye openings that slant up or down (upslanting palpebral fissures or downslanting palpebral fissures), a flat bridge of the nose, or a thin upper lip. Other, less-common abnormalities involving the bones and skin include premature fusion of certain skull bones (craniosynostosis), unusually loose (lax) joints, and loose skin. Neurodevelopmental disorders can also occur in Xia-Gibbs syndrome. Some affected individuals have  autism spectrum disorder, which is characterized by impaired communication and social interactions, or attention-deficit/hyperactivity disorder (ADHD). Other problems can include aggression, anxiety, poor impulse control, and self-injury.","Curated_Disease_Description_Source__c":"PlainLanguagePilotV1-Sep23","GARD_Synonym__c":"ahdc1-related intellectual disability-obstructive sleep apnea-mild dysmorphism syndrome; ahdc1-related intellectual disability, obstructive sleep apnea, mild dysmorphism syndrome; at-hook dna binding motif containing 1-related intellectual disability, obstructive sleep apnea, mild dysmorphism syndrome; autosomal dominant intellectual disability 25; mrd25; xia gibbs syndrome; xia-gibbs syndrome","Name":"AHDC1-related intellectual disability - obstructive sleep apnea - mild dysmorphi","Curated_USA_Estimate__c":"1,000","estimateUsa":"1,000"}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"Simons Searchlight","Website__c":"https://www.simonssearchlight.org/"},{"Account_Name__c":"Alianza Iberoamericana de Enfermedades Raras o Poco Frecuentes","Website__c":"https://aliber.org/web/"},{"Account_Name__c":"Federación Mexicana de Enfermedades Raras (FEMEXER)","Website__c":"http://www.femexer.org/"},{"Account_Name__c":"Federación Española de Enfermedades Raras","Website__c":"https://enfermedades-raras.org/"},{"Account_Name__c":"Federación Colombiana de Enfermedades Raras","Website__c":"http://www.fecoer.org"},{"Account_Name__c":"Federación Argentina de Enfermedades Poco Frecuentes","Website__c":"https://fadepof.org.ar/"},{"Account_Name__c":"Asociación Todos Unidos Enfermedades Raras Uruguay","Website__c":"https://atueru.org.uy/"},{"Account_Name__c":"Xia-Gibbs Society","Website__c":"https://xia-gibbs.org/"}],"GARD_Disease_Tag__c":[{"Tag_Name__c":"Genetics","Tag_Category__c":"Cause;Disease Category;Specialist","category_description":"Genetic diseases affect the DNA, or genetic instructions, which directs how tissues, organs, and body systems function.","curated_tag_name":"Genetic diseases"},{"Tag_Name__c":"Neurology","Tag_Category__c":"Disease Category;Specialist","category_description":"Neurological diseases affect the brain, spinal cord, cranial nerves, autonomic nerves, or other peripheral nerves.","curated_tag_name":"Neurological diseases"},{"Tag_Name__c":"Neurodevelopmental disabilities","Tag_Category__c":"Specialist","curated_tag_name":"Neurodevelopmental disabilities"},{"Tag_Name__c":"Pediatrics","Tag_Category__c":"Specialist"}],"Age_At_Onset__c":[{"Age_At_Onset__c":"Neonatal","Provided_By__c":"ORPHA:412069"}],"External_Identifier_Disease__c":[{"URL__c":"https://raresource.nih.gov/diseases/filter/0013409","Source__c":"RareSource"},{"URL__c":"https://www.ncbi.nlm.nih.gov/books/NBK575793","Source__c":"Gene Review","Xref__c":"NBK575793"},{"URL__c":"https://www.omim.org/entry/615829","Source__c":"C4014419; MONDO:0014358; ORPHA:412069","Xref__c":"OMIM:615829"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=862856","Source__c":"C4014419","Xref__c":"MEDGEN:862856"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C4014419","Source__c":"C4014419","Xref__c":"C4014419"},{"URL__c":"https://www.orpha.net/en/disease/detail/412069","Source__c":"C4014419; MONDO:0014358; ORPHA:412069","Xref__c":"ORPHA:412069"},{"URL__c":"https://www.ebi.ac.uk/ols4/ontologies/doid/classes?obo_id=DOID%3A0070055","Source__c":"MONDO:0014358","Xref__c":"DOID:0070055"},{"URL__c":"https://evsexplore.semantics.cancer.gov/evsexplore/concept/ncit/C192092","Source__c":"C4014419","Xref__c":"C192092"},{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=774068004","Source__c":"C4014419","Xref__c":"774068004"},{"URL__c":"https://medlineplus.gov/genetics/condition/xia-gibbs-syndrome","Source__c":"GARD:0013409","Xref__c":"https://medlineplus.gov/genetics/condition/xia-gibbs-syndrome"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0014358","Source__c":"GARD:0013409","Xref__c":"MONDO:0014358"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"AHDC1","GHR_URL__c":"https://medlineplus.gov/genetics/gene/ahdc1","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["Autosomal dominant"],"GARD_Disease_Feature__c":[{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Impaired ability to eat related to problems gathering food and getting ready to suck, chew, or swallow it.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011968","HPO_Synonym__c":"Decreased oral intake; Feeding difficulties; Feeding problems; Poor feeding","HPO_Name__c":"Feeding difficulties","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Increased resistance to the passage of air in the upper airway.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002781","HPO_Synonym__c":"Upper airway obstruction","HPO_Name__c":"Upper airway obstruction","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A form of loss of vision caused by damage to the visual cortex rather than a defect in the eye.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0100704","HPO_Synonym__c":"Cortical blindness; Cortical visual impairment; Cortical/cerebral visual impairment; CVI","HPO_Name__c":"Cerebral visual impairment","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A delay in the acquisition of the ability to use language to communicate needs, wishes, or thoughts.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002474","HPO_Synonym__c":"Deficit in expressive language","HPO_Name__c":"Expressive language delay","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A failure to achieve the ability to walk at an appropriate developmental stage. Most children learn to walk in a series of stages, and learn to walk short distances independently between 12 and 15 months.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0031936","HPO_Synonym__c":"Delayed walking","HPO_Name__c":"Delayed ability to walk","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormal morphology (form) of the face or its components.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001999","HPO_Synonym__c":"Abnormal facial shape; Abnormal morphology of the face; Distinctive facies; Dysmorphic facial features; Dysmorphic facies; Facial dysmorphism; Unusual facial appearance; Unusual facies","HPO_Name__c":"Abnormal facial shape","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Underdevelopment of the corpus callosum.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002079","HPO_Synonym__c":"Corpus callosum hypoplasia; Hypoplasia of corpus callosum; Hypoplastic corpus callosum; Underdevelopment of part of brain called corpus callosum","HPO_Name__c":"Hypoplasia of the corpus callosum","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A state of respiratory distress that requires a life saving intervention in the form of gaining airway access and instituting positive pressure ventilation.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0004887","HPO_Synonym__c":"Respiratory distress necessitating mechanical ventilation; Respiratory distress requiring endotracheal intubation; Respiratory distress requiring mechanical ventilation","HPO_Name__c":"Respiratory failure requiring assisted ventilation","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Posterior positioning of the nasal root in relation to the overall facial profile for age.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0005280","HPO_Synonym__c":"Depressed bridge of nose; Depressed nasal bridge; Depressed nasal root; Flat bridge of nose; Flat nasal bridge; Flat nasal root; Flat, nasal bridge; Flattened nasal bridge; Low nasal bridge; Low nasal root; Retruded bridge of nose; Retruded nasal bridge","HPO_Name__c":"Depressed nasal bridge","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A misalignment of the eyes so that the visual axes deviate from bifoveal fixation. The classification of strabismus may be based on a number of features including the relative position of the eyes, whether the deviation is latent or manifest, intermittent or constant, concomitant or otherwise and according to the age of onset and the relevance of any associated refractive error.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000486","HPO_Synonym__c":"Cross-eyed; Squint; Squint eyes","HPO_Name__c":"Strabismus","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Upper insertion of the ear to the scalp below an imaginary horizontal line drawn between the inner canthi of the eye and extending posteriorly to the ear.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000369","HPO_Synonym__c":"Low set ears; Low-set ears; Low-set pinnae; Lowset ears; Melotia","HPO_Name__c":"Low-set ears","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006951","HPO_Name__c":"Retrocerebellar cyst","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"The presence of an abnormal lateral curvature of the spine.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002650","HPO_Name__c":"Scoliosis","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"The term intellectual disability or intellectual developmental disorder is used to describe significantly sub-average intellectual and adaptive functioning based on clinical assessment and as measured by individually administered, appropriately normed, standardized and validated tests of intellectual functioning and adaptive behavior, with onset during the developmental period from infancy through adolescence.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001249","HPO_Synonym__c":"Intellectual disability; Mental deficiency; Mental retardation; Mental retardation, nonspecific; Mental-retardation; Nonprogressive intellectual disability; Nonprogressive mental retardation","HPO_Name__c":"Intellectual disability","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Laryngomalacia is a congenital abnormality of the laryngeal cartilage in which the cartilage is floppy and prolapses over the larynx during inspiration.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001601","HPO_Synonym__c":"Softening of voice box tissue","HPO_Name__c":"Laryngomalacia","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Angle formed by the plane of the ear and the mastoid bone greater than the 97th centile for age (objective); or, outer edge of the helix more than 2 cm from the mastoid at the point of maximum distance (objective).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000411","HPO_Synonym__c":"Prominent ear; Prominent ears","HPO_Name__c":"Protruding ear","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A decreased magnitude of the sensory perception of sound.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000365","HPO_Synonym__c":"Deafness; Hearing defect; Hearing impairment; Hypacusis","HPO_Name__c":"Hearing impairment","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Interpupillary distance more than 2 SD above the mean (alternatively, the appearance of an increased interpupillary distance or widely spaced eyes).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000316","HPO_Synonym__c":"Excessive orbital separation; Increased distance between eye sockets; Increased distance between eyes; Increased interpupillary distance; Ocular hypertelorism; Wide-set eyes; Widely spaced eyes; Widened interpupillary distance","HPO_Name__c":"Hypertelorism","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A type of Developmental delay characterized by a delay in acquiring motor skills.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001270","HPO_Synonym__c":"Delay in development of motor milestones; Delay in motor development; Delayed development of motor milestones; Delayed early motor milestones; Delayed motor development; Delayed motor milestones; Locomotor delay; Motor developmental delay; Motor developmental milestones not achieved; Motor retardation; Retarded motor development; Slow development of motor milestones","HPO_Name__c":"Motor delay","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"In primary position, the eyes drift slowly downward and then spontaneously beat upward. Upward gaze accentuates the nystagmus. The associated oscillopsias are often very irritating, but the symptoms are usually transient.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011477","HPO_Name__c":"Upbeat nystagmus","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A structural abnormality of the brain, which has as its parts the forebrain, midbrain, and hindbrain.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012443","HPO_Synonym__c":"Abnormal shape of brain; Abnormality of brain morphology; Abnormality of the brain","HPO_Name__c":"Abnormal brain morphology","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Ataxia refers to impaired coordination of voluntary muscle movement. Cerebellar ataxia refers to ataxia due to dysfunction of the cerebellum. This causes a variety of elementary neurological deficits including asynergy (lack of coordination between muscles, limbs and joints), dysmetria (lack of ability to judge distances that can lead to under- or overshoot in grasping movements), and dysdiadochokinesia (inability to perform rapid movements requiring antagonizing muscle groups to be switched on and off repeatedly).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001251","HPO_Synonym__c":"Cerebellar ataxia","HPO_Name__c":"Ataxia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A delay in the achievement of motor or mental milestones in the domains of development of a child, including motor skills, speech and language, cognitive skills, and social and emotional skills. This term should only be used to describe children younger than five years of age.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001263","HPO_Synonym__c":"Delayed cognitive development; Delayed development; Delayed developmental milestones; Delayed intellectual development; Delayed milestones; Delayed psychomotor development; Developmental delay; Developmental delay in early childhood; Developmental delay, global; Developmental retardation; GDD; Lack of psychomotor development; Motor and developmental delay; Motormental retardation; Psychomotor delay; Psychomotor development deficiency; Psychomotor development failure; Psychomotor developmental delay; Retarded development; Retarded mental development; Retarded psychomotor development","HPO_Name__c":"Global developmental delay","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Obstructive Sleep Apnea is a condition characterized by the obstruction of the airway and pauses in breathing during sleep, which occur multiple times throughout the night. It is related to the relaxation of muscle tone that typically happens during sleep, leading to a partial collapse of the soft tissues in the airway and causing airflow obstruction.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002870","HPO_Name__c":"Obstructive sleep apnea","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Delayed myelination.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012448","HPO_Name__c":"Delayed myelination","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Abnormality of the corpus callosum.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001273","HPO_Synonym__c":"Abnormal corpus callosum; Abnormality of the corpus callosum; Corpus callosum abnormality","HPO_Name__c":"Abnormal corpus callosum morphology","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Autism is a neurodevelopmental disorder characterized by impaired social interaction and communication, and by restricted and repetitive behavior. Autism begins in childhood. It is marked by the presence of markedly abnormal or impaired development in social interaction and communication and a markedly restricted repertoire of activity and interest. Manifestations of the disorder vary greatly depending on the developmental level and chronological age of the individual (DSM-IV).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000717","HPO_Synonym__c":"Autism","HPO_Name__c":"Autism","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An eye that is more deeply recessed into the plane of the face than is typical.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000490","HPO_Synonym__c":"Deep set eye; Deep-set eyes; Deeply set eye; Enophthalmos; Ocular depression; Sunken eye; Sunken eyes","HPO_Name__c":"Deeply set eye","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Developmental hypoplasia of the mandible.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000347","HPO_Synonym__c":"Decreased size of lower jaw; Decreased size of mandible; Hypoplasia of lower jaw; Hypoplasia of mandible; Hypoplastic mandible; Hypoplastic mandible condyle; Hypotrophic lower jaw; Hypotrophic mandible; Little lower jaw; Little mandible; Lower jaw deficiency; Lower jaw hypoplasia; Mandibular deficiency; Mandibular hypoplasia; Mandibular micrognathia; Micrognathia of lower jaw; Micromandible; Robin mandible; Severe hypoplasia of mandible; Small jaw; Small lower jaw; Small mandible; Underdevelopment of lower jaw; Underdevelopment of mandible","HPO_Name__c":"Micrognathia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Deep, noisy breathing during sleep, accompanied by hoarse or harsh sounds, is caused by the vibration of respiratory structures, especially the soft palate. This vibration results in sound due to obstructed air movement during breathing while sleeping.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0025267","HPO_Synonym__c":"Snore; Snores; Snoring symptoms","HPO_Name__c":"Snoring","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Abnormality observed by electroencephalogram (EEG), which is used to record of the brain's spontaneous electrical activity from multiple electrodes placed on the scalp.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002353","HPO_Synonym__c":"Abnormal EEG; Abnormal electroencephalogram; EEG abnormalities; Electroencephalogram abnormal; Electroencephalogram abnormalities","HPO_Name__c":"EEG abnormality","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Procedure_EEG"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Reduced volume of the earlobe.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000385","HPO_Synonym__c":"Hypoplastic earlobes; Hypoplastic lobules; Small earlobe; Small earlobes","HPO_Name__c":"Small earlobe","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Failure to thrive (FTT) refers to a child whose physical growth is substantially below the norm.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001508","HPO_Synonym__c":"Faltering weight; FTT; Postnatal failure to thrive; Weight faltering","HPO_Name__c":"Failure to thrive","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An abnormal orientation of the earlobes such that they point out- and upward. That is, the lateral surface of ear lobe faces superiorly.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0009909","HPO_Synonym__c":"Fleshy upturned lobules; Lobe, uplifted; Uplifted earlobe; Upturned earlobe","HPO_Name__c":"Uplifted earlobe","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A seizure is an intermittent abnormality of nervous system physiology characterized by a transient occurrence of signs and/or symptoms due to abnormal excessive or synchronous neuronal activity in the brain.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001250","HPO_Synonym__c":"Epileptic seizure; Seizures","HPO_Name__c":"Seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Hypotonia is an abnormally low muscle tone (the amount of tension or resistance to movement in a muscle). Even when relaxed, muscles have a continuous and passive partial contraction which provides some resistance to passive stretching. Hypotonia thus manifests as diminished resistance to passive stretching. Hypotonia is not the same as muscle weakness, although the two conditions can co-exist.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001252","HPO_Synonym__c":"Low muscle tone; Low or weak muscle tone; Muscle hypotonia; Muscular hypotonia","HPO_Name__c":"Hypotonia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A mild form of myopia with up to -3.00 diopters.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0025573","HPO_Name__c":"Mild myopia","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Any abnormality of the vertebral column.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000925","HPO_Synonym__c":"Abnormal spine; Abnormal vertebral column; Abnormality of the spine; Abnormality of the vertebral column","HPO_Name__c":"Abnormality of the vertebral column","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A degree of language development that is significantly below the norm for a child of a specified age.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000750","HPO_Synonym__c":"Deficiency of speech development; Delayed language development; Delayed speech; Delayed speech acquisition; Delayed speech and language development; Delayed speech development; Impaired speech and language development; Impaired speech development; Language delay; Language delayed; Language development deficit; Late-onset speech development; Poor language development; Speech and language delay; Speech and language difficulties; Speech delay","HPO_Name__c":"Delayed speech and language development","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"The capability that a joint (or a group of joints) has to move, passively and/or actively, beyond normal limits along physiological axes.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001382","HPO_Synonym__c":"Double-Jointed; Extensible joints; Flexible joints; Hyperextensible joints; Increased joint mobility; Increased mobility of joints; Joint hyperextensibility; Joint hyperflexibility; Joint hyperlaxity; Joint laxity; Joints move beyond expected range of motion; Lax joints; Loose-jointedness","HPO_Name__c":"Joint hypermobility","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"The palpebral fissure inclination is more than two standard deviations above the mean for age (objective); or, the inclination of the palpebral fissure is greater than typical for age.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000582","HPO_Synonym__c":"Mongoloid slant; Upslanting palpebral fissures; Upward slanted palpebral fissures; Upward slanting of palpebral fissures; Upward slanting of the opening between the eyelids; Upward slanting palpebral fissures","HPO_Name__c":"Upslanted palpebral fissure","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Craniosynostosis refers to the premature closure of the cranial sutures. Primary craniosynostosis refers to the closure of one or more sutures due to abnormalities in skull development, and secondary craniosynostosis results from failure of brain growth.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001363","HPO_Synonym__c":"Cranial suture synostosis; Craniosyostosis; Early fusion of cranial sutures; Premature closure of cranial sutures; Premature suture closure","HPO_Name__c":"Craniosynostosis","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002779","HPO_Synonym__c":"Floppy windpipe","HPO_Name__c":"Tracheomalacia","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"The palpebral fissure inclination is more than two standard deviations below the mean.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000494","HPO_Synonym__c":"Antimongoloid eye slant; Antimongoloid slant of palpebral fissures; Antimongoloid slanted palpebral fissures; Down slanting palpebral fissures; Down-slanted palpebral fissures; Down-slanting palpebral fissure; Down-slanting palpebral fissures; Downslanting palpebral fissure; Downslanting palpebral fissures; Downward slanted palpebral fissures; Downward slanting of the opening between the eyelids; Downward slanting palpebral fissures; Downward-slanting palpebral fissures; Palpebral fissures down-slanted","HPO_Name__c":"Downslanted palpebral fissures","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:412069","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A form of strabismus with one or both eyes turned inward ('crossed') to a relatively severe degree, usually defined as 10 diopters or more.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000565","HPO_Synonym__c":"Inward turning cross eyed","HPO_Name__c":"Esotropia","HPO_Feature_Type__c":"Symptom"}}],"tags":{"Cause":["Genetics"],"Disease Category":["Genetics","Neurology"],"Specialist":["Genetics","Neurology","Neurodevelopmental disabilities","Pediatrics"]},"synonyms":["ahdc1-related intellectual disability-obstructive sleep apnea-mild dysmorphism syndrome"," ahdc1-related intellectual disability, obstructive sleep apnea, mild dysmorphism syndrome"," at-hook dna binding motif containing 1-related intellectual disability, obstructive sleep apnea, mild dysmorphism syndrome"," autosomal dominant intellectual disability 25"," mrd25"," xia gibbs syndrome"," xia-gibbs syndrome"],"spanishId":13573,"spanishName":"sindrome-de-xia-gibbs"}