{"Name":"Pelizaeus-Merzbacher disease, connatal form","DiseaseID__c":"GARD:0017291","id":17291,"encodedName":"pelizaeus-merzbacher-disease-connatal-form","IsDeleted":false,"Disease_Name_Full__c":"Pelizaeus-Merzbacher disease, connatal form","Xref_IDs__c":"423022865; C5679776; MEDGEN:1842817; MONDO:0017221; ORPHA:280210","USA_Estimate__c":"1,000","No_of_Specialist_Tagsa__c":6,"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":2,"Disease_Characteristics_Score__c":8,"No_of_Age_at_Onset__c":2,"Description_Source__c":"MONDO:0017221","Disease_Description__c":"The connatal form of Pelizaeus-Merzbacher disease (PMD) is the most severe form of PMD (see this term).","GARD_Name__c":"Pelizaeus-Merzbacher disease, connatal form","GARD_Synonym__c":"connatal pmd; pelizaeus-merzbacher disease type ii; severe pmd","Curated_Disease_Description_Source__c":"MONDO:0017221","Curated_Disease_Description__c":"The connatal form of Pelizaeus-Merzbacher disease (PMD) is the most severe form of PMD.","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":"1,000","Age_at_Onset_Snippet_Text__c":"as a Newborn and as an Infant","SourceID__c":"ORPHA:280210","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0017221","ORPHANET_ID__c":"ORPHA:280210","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Enfermedad de pelizaeus-merzbacher, forma connatal","Spanish_Description_Source__c":"ORPHA:280210","Spanish_Description__c":"La forma connatal de la enfermedad de Pelizaeus-Merzbacher (PMD) es la forma más grave de la PMD (consulte este término).","Spanish_Disease_Name__c":"enfermedad de pelizaeus-merzbacher, forma connatal","Spanish_GARD_Synonym__c":"enfermedad de pelizaeus-merzbacher connatal tipo ii; pmd connatal; pmd grave","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":"The connatal form of Pelizaeus-Merzbacher disease (PMD) is the most severe form of PMD.","Curated_Disease_Description_Source__c":"MONDO:0017221","GARD_Synonym__c":"connatal pmd; pelizaeus-merzbacher disease type ii; severe pmd","Name":"Pelizaeus-Merzbacher disease, connatal form","Curated_USA_Estimate__c":"1,000","estimateUsa":"1,000"}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"Pelizaeus-Merzbacher Disease Foundation","Website__c":"https://www.pmdfoundation.org/"},{"Account_Name__c":"United Leukodystrophy Foundation","Website__c":"https://ulf.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":"Ophthalmology","Tag_Category__c":"Specialist"},{"Tag_Name__c":"Leukodystrophy","Tag_Category__c":"Account;Cause;Disease Category","category_description":"Leukodystrophies are a group of genetic neurological diseases that affect the white matter of the brain and spinal cord.","curated_tag_name":"Leukodystrophies"},{"Tag_Name__c":"Neuro-Ophthalmology","Tag_Category__c":"Specialist","curated_tag_name":"Neuro-ophthalmic 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:280210"},{"Age_At_Onset__c":"Infancy","Provided_By__c":"ORPHA:280210"}],"External_Identifier_Disease__c":[{"URL__c":"https://www.ncbi.nlm.nih.gov/books/NBK1182","Source__c":"Gene Review","Xref__c":"NBK1182"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C5679776","Source__c":"C5679776","Xref__c":"C5679776"},{"URL__c":"https://www.orpha.net/en/disease/detail/280210","Source__c":"C5679776; MONDO:0017221; ORPHA:280210","Xref__c":"ORPHA:280210"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=1842817","Source__c":"C5679776","Xref__c":"MEDGEN:1842817"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0017221","Source__c":"GARD:0017291","Xref__c":"MONDO:0017221"},{"URL__c":"https://secure.ssa.gov/apps10/poms.nsf/lnx/0423022865","Xref__c":"423022865"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"PLP1","GHR_URL__c":"https://medlineplus.gov/genetics/gene/plp1","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["X-linked recessive"],"GARD_Disease_Feature__c":[{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"The condition of inability to eat normally treated by placement of a thin tube through the nose into the stomach that is then used to carry food.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0040288","HPO_Name__c":"Nasogastric tube feeding","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","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:280210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Pachygyria is a malformation of cortical development with abnormally wide gyri with sulci 1,5-3 cm apart and abnormally thick cortex measuring more than 5 mm (radiological definition). 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The abnormal posture of the foot in dystonic gait typically involves inversion, plantar flexion and tonic extension of the big toe. In many patients complex types of walking, such as walking backwards and running are paradoxically less impaired than walking forward and may seem completely unaffected. Sensory tricks, for instance, if the affected individual rests a hand on his or her neck, may improve or even normalize dystonic gait in some patients.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0031954","HPO_Name__c":"Dystonic gait","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormality of any of the muscles of the pharynx.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0430015","HPO_Synonym__c":"Abnormality of muscles of the pharynx; Abnormality of musculature of pharynx; Abnormality of pharyngeal musculature; Abnormality of pharynx musculature","HPO_Name__c":"Abnormal morphology of musculature of pharynx","Feature_System__c":"Musculoskeletal System; Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Frequent (30-79%)","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:280210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Rhythmic, involuntary sinusoidal oscillations of one or both eyes. The waveform of pendular nystagmus may occur in any direction.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012043","HPO_Name__c":"Pendular nystagmus","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Reduced amount of myelin in the nervous system resulting from defective myelinogenesis in the white matter of the central nervous system.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006808","HPO_Synonym__c":"Hypomyelination of the brain","HPO_Name__c":"Cerebral hypomyelination","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Gliosis is the focal proliferation of glial cells in the central nervous system.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002171","HPO_Synonym__c":"Cerebral gliosis; Excess astrocytes in brain","HPO_Name__c":"Gliosis","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Spasticity (velocity-dependent increase in tonic stretch reflexes with increased muscle tone and hyperexcitable tendon reflexes) in the muscles of the lower limbs, hips, and pelvis.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002061","HPO_Synonym__c":"Lower extremities spasticity; Lower extremity spasticity; Spastic lower extremities; Spastic lower extremity; Spastic lower limb; Spastic lower limbs; Spasticity in lower extremities; Spasticity in lower extremity; Spasticity in lower limb; Spasticity in lower limbs; Spasticity of lower extremities; Spasticity of lower extremity; Spasticity of lower limb; Spasticity of lower limbs","HPO_Name__c":"Lower limb spasticity","Feature_System__c":"Nervous System; Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A height below that which is expected according to age and sex norms. Although there is no universally accepted definition of short stature, many refer to \\\"short stature\\\" as height more than 2 standard deviations below the mean for age and sex (or below the 3rd percentile for age and sex dependent norms).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0004322","HPO_Synonym__c":"Decreased body height; Height less than 3rd percentile; Short stature; Small stature; Stature below 3rd percentile","HPO_Name__c":"Short stature","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Incapability to ambulate.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002540","HPO_Synonym__c":"Inability to walk; Non-ambulatory","HPO_Name__c":"Inability to walk","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Occasional (5-29%)","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:280210","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Any anomaly in the process by which myelin sheaths are formed and maintained around neurons.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012447","HPO_Name__c":"Abnormal myelination","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Difficulty to maintain correct position of the head while standing or sitting. Infant head lag is observed when the head seems to flop around or lags posteriorly behind the trunk. Several articles have maintained that head lag should be absent by age 3 to 4 months.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002421","HPO_Synonym__c":"Delay in head control; Delay in head righting; Infant head lag; Poor head control","HPO_Name__c":"Poor head control","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Severe intellectual disability (ID) is defined as a type of ID characterized by severely sub-average adaptive functioning and intellectual functioning, with an intelligence quotient (IQ) the range of 20-34.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0010864","HPO_Synonym__c":"Early and severe mental retardation; Intellectual disability, severe; Mental retardation, severe; Severe mental retardation","HPO_Name__c":"Severe intellectual disability","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Rhythmic, involuntary oscillations of one or both eyes related to abnormality in fixation, conjugate gaze, or vestibular mechanisms.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000639","HPO_Synonym__c":"Involuntary, rapid, rhythmic eye movements","HPO_Name__c":"Nystagmus","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Complete lack of development of speech and language abilities.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001344","HPO_Synonym__c":"Absent speech development; Lack of language development; Lack of speech; No speech development; No speech or language development; Nonverbal","HPO_Name__c":"Absent speech","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Areas of brighter than expected MRI signal in the white matter of the brain whereby individual patches run together.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0040330","HPO_Name__c":"Confluent hyperintensity of cerebral white matter on MRI","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Imaging_MRI"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A severe form of respiratory insufficiency characterized by inadequate gas exchange such that the levels of oxygen or carbon dioxide cannot be maintained within normal limits.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002878","HPO_Synonym__c":"Respiratory failure","HPO_Name__c":"Respiratory failure","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Dysarthric speech is a general description referring to a neurological speech disorder characterized by poor articulation. Depending on the involved neurological structures, dysarthria may be further classified as spastic, flaccid, ataxic, hyperkinetic and hypokinetic, or mixed.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001260","HPO_Synonym__c":"Difficulty articulating speech; Dysarthric speech","HPO_Name__c":"Dysarthria","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0004302","HPO_Synonym__c":"Functional motor problems","HPO_Name__c":"Functional motor deficit","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Muscular atrophy affecting the lower limb.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007210","HPO_Name__c":"Lower limb amyotrophy","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Nodding movement of the head or body.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0030187","HPO_Name__c":"Titubation","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:280210","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormal high-pitched noisy sound, occurring during inhalation or exhalation caused by the incomplete obstruction in the throat.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006511","HPO_Synonym__c":"Laryngeal stidor","HPO_Name__c":"Laryngeal stridor","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}}],"tags":{"Cause":["Genetics","Leukodystrophy"],"Disease Category":["Genetics","Neurology","Leukodystrophy"],"Specialist":["Genetics","Neurology","Ophthalmology","Neuro-Ophthalmology","Neurodevelopmental disabilities","Pediatrics"],"Account":["Leukodystrophy"]},"synonyms":["connatal pmd"," pelizaeus-merzbacher disease type ii"," severe pmd"]}