{"Name":"Tetrasomy 21","DiseaseID__c":"GARD:0012480","id":12480,"encodedName":"tetrasomy-21","IsDeleted":false,"Disease_Name_Full__c":"Tetrasomy 21","Xref_IDs__c":"764690001; C4707057; MEDGEN:1640242; MONDO:0019864; ORPHA:96055","USA_Estimate__c":"1,000","No_of_Specialist_Tagsa__c":2,"No_of_ClinGen_records__c":0,"No_of_GeneReviews__c":0,"No_of_HHS_records__c":0,"World_Estimate__c":"1 to 8,000","No_of_HRSA_records__c":0,"Evidence_Based_Score__c":0,"No_of_Disease_Descriptions__c":2,"Disease_Characteristics_Score__c":7,"No_of_Age_at_Onset__c":3,"Description_Source__c":"MONDO:0019864","Disease_Description__c":"Tetrasomy 21 is an extremely rare autosomal anomaly resulting from the presence of 4 copies of chromosome 21, characterized by features of trisomy 21 including developmental delay/intellectual disability, muscular hypotonia, short neck with redundant skin, brachycephaly, microcephaly, flat face, epicanthus, upslanted palpebral fissures, small ears, protruding tongue, single transverse palmar crease, brachydactyly, hypoplastic iliac wings, together with additional features such as prematurity, intrauterine growth retardation, high and broad forehead, hypertelorism. Haematological malignancies are also associated and may occur earlier than in trisomy 21.","GARD_Name__c":"Tetrasomy 21","GARD_Synonym__c":"isochromosome 21; tetrasomy type 21","Curated_Disease_Description_Source__c":"MONDO:0019864","Curated_Disease_Description__c":"Tetrasomy 21 is an extremely rare autosomal anomaly resulting from the presence of 4 copies of chromosome 21, characterized by features of trisomy 21 including developmental delay/intellectual disability, muscular hypotonia, short neck with redundant skin, brachycephaly, microcephaly, flat face, epicanthus, upslanted palpebral fissures, small ears, protruding tongue, single transverse palmar crease, brachydactyly, hypoplastic iliac wings, together with additional features such as prematurity, intrauterine growth retardation, high and broad forehead, hypertelorism. Haematological malignancies are also associated and may occur earlier than in trisomy 21.","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":"1,000","Age_at_Onset_Snippet_Text__c":"during Pregnancy, at Birth, and as an Infant","SourceID__c":"ORPHA:96055","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0019864","ORPHANET_ID__c":"ORPHA:96055","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Síndrome de tetrasomía 21","Spanish_Description_Source__c":"ORPHA:96055","Spanish_Description__c":"La tetrasomía 21 es una anomalía autosómica muy poco frecuente resultante de la presencia de 4 copias del cromosoma 21, caracterizada por los rasgos de la trisomía 21 incluyendo retraso del desarrollo / discapacidad intelectual, hipotonía muscular, cuello corto con piel redundante, braquicefalia, microcefalia, cara plana, epicanto, fisuras palpebrales inclinadas hacia arriba, orejas pequeñas, lengua protuberante, pliegue palmar transversal único, braquidactilia, alas ilíacas hipoplásicas, junto con características adicionales como prematuridad, retraso del crecimiento intrauterino, frente alta y ancha e hipertelorismo. También están asociadas neoplasias hematológicas que pueden desarrollarse antes que en la trisomía 21.","Spanish_Disease_Name__c":"síndrome de tetrasomía 21","Spanish_GARD_Synonym__c":"isocromosoma 21","Category_Linearization__c":"ORPHA:93890","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":"Tetrasomy 21 is an extremely rare autosomal anomaly resulting from the presence of 4 copies of chromosome 21, characterized by features of trisomy 21 including developmental delay/intellectual disability, muscular hypotonia, short neck with redundant skin, brachycephaly, microcephaly, flat face, epicanthus, upslanted palpebral fissures, small ears, protruding tongue, single transverse palmar crease, brachydactyly, hypoplastic iliac wings, together with additional features such as prematurity, intrauterine growth retardation, high and broad forehead, hypertelorism. Haematological malignancies are also associated and may occur earlier than in trisomy 21.","Curated_Disease_Description_Source__c":"MONDO:0019864","GARD_Synonym__c":"isochromosome 21; tetrasomy type 21","Name":"Tetrasomy 21","Curated_USA_Estimate__c":"1,000","estimateUsa":"1,000"}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"Unique","Website__c":"https://rarechromo.org/"},{"Account_Name__c":"Chromosome Disorder Outreach","Website__c":"https://chromodisorder.org/"}],"GARD_Disease_Tag__c":[{"Tag_Name__c":"Chromosomal Anomaly","Tag_Category__c":"Account;Cause","curated_tag_name":"Chromosome disorders"},{"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":"Congenital Abnormality","Tag_Category__c":"Disease Category","category_description":"Birth defects are structural changes present at birth that can affect almost any part of the body, including how the body looks, works, or both.","curated_tag_name":"Birth defects"},{"Tag_Name__c":"Pediatrics","Tag_Category__c":"Specialist"}],"Age_At_Onset__c":[{"Age_At_Onset__c":"Infancy","Provided_By__c":"ORPHA:96055"},{"Age_At_Onset__c":"Antenatal","Provided_By__c":"ORPHA:96055"},{"Age_At_Onset__c":"Neonatal","Provided_By__c":"ORPHA:96055"}],"External_Identifier_Disease__c":[{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=764690001","Source__c":"C4707057; MONDO:0019864","Xref__c":"764690001"},{"URL__c":"https://www.orpha.net/en/disease/detail/96055","Source__c":"C4707057; MONDO:0019864; ORPHA:96055","Xref__c":"ORPHA:96055"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=1640242","Source__c":"C4707057","Xref__c":"MEDGEN:1640242"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C4707057","Source__c":"C4707057","Xref__c":"C4707057"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0019864","Source__c":"GARD:0012480","Xref__c":"MONDO:0019864"}],"GARD_Disease_Feature__c":[{"Provided_By__c":"ORPHA:96055","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"The facial appearance is more circular than usual as viewed from the front.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000311","HPO_Synonym__c":"Circular face; Round face; Round facial appearance; Round facial shape; Round facies","HPO_Name__c":"Round face","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:96055","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Head circumference below 2 standard deviations below the mean for age and sex.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000252","HPO_Synonym__c":"Abnormally small cranium; Abnormally small skull; Decreased circumference of cranium; Decreased size of cranium; Decreased size of skull; Reduced head circumference; small cranium; Small head circumference","HPO_Name__c":"Microcephaly","Feature_System__c":"Nervous System; Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:96055","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:96055","HPO_Frequency__c":"Frequent (30-79%)","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:96055","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Digits that appear disproportionately short compared to the hand/foot. The word brachydactyly is used here to describe a series distinct patterns of shortened digits (brachydactyly types A-E). This is the sense used here.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001156","HPO_Synonym__c":"Brachydactyly syndrome; Short fingers or toes","HPO_Name__c":"Brachydactyly","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:96055","HPO_Frequency__c":"Frequent (30-79%)","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:96055","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A congenital heart defect characterized by a specific combination of heart defects with a common atrioventricular valve, primum atrial septal defect and inlet ventricular septal defect.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001674","HPO_Synonym__c":"Common atrioventricular canal; Complete atrioventricular canal; Complete atrioventricular septal defect; Complete common AV canal","HPO_Name__c":"Complete atrioventricular canal defect","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:96055","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A unique clonal neoplastic disorder that is linked to trisomy 21, is restricted to neonatal period, and spontaneously regresses. It often has characteristics of megakaryocytic lineage and is associated with GATA1 mutations in myeloblasts.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0005534","HPO_Synonym__c":"TMD; Transient leukemia of Down syndrome; Transient myeloproliferative disorder","HPO_Name__c":"Transient myeloproliferative syndrome","Feature_System__c":"Immune System; Blood and Blood-Forming Tissue","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:96055","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"The distal and proximal transverse palmar creases are merged into a single transverse palmar crease.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000954","HPO_Synonym__c":"Simian crease; Simian creases; Simian line; Single flexion crease; Single palmar crease; Single palmar creases; Single transverse palmar creases; Transverse palmar crease","HPO_Name__c":"Single transverse palmar crease","Feature_System__c":"Skin System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:96055","HPO_Frequency__c":"Frequent (30-79%)","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:96055","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:96055","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:96055","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Increased length and width of the tongue.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000158","HPO_Synonym__c":"Abnormally large tongue; Hyperplasia of the tongue; Hypertrophy of the tongue; Increased size of tongue; Large tongue; Tongue hypertrophy","HPO_Name__c":"Macroglossia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:96055","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A widely spaced gap between the first toe (the great toe) and the second toe.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001852","HPO_Synonym__c":"Gap between 1st and 2nd toes; Gap between first and second toe; Increased space between first and second toes; Sandal gap between first and second toes; Space between great toe and second toe; Wide space between 1st, 2nd toes; Wide space between first and second toes; Wide-spaced big toe; Widely spaced 1st-2nd toes; Widely spaced first and second toes; Widened gap 1st-2nd toes; Widened gap first and second toe","HPO_Name__c":"Sandal gap","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:96055","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Tongue extending beyond the alveolar ridges or teeth at rest.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0010808","HPO_Synonym__c":"Lingual prolapse; Lingual prominence; Lingual protrusion; Prolapse of tongue; Prominent tongue; Protruding tongue; Tongue protrusion; Tongue sticking out of mouth","HPO_Name__c":"Protruding tongue","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:96055","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormality of skull shape characterized by a decreased anterior-posterior diameter. That is, a cephalic index greater than 81%. Alternatively, an apparently shortened anteroposterior dimension (length) of the head compared to width.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000248","HPO_Synonym__c":"Short and broad skull","HPO_Name__c":"Brachycephaly","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:96055","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A thickening of the skin thickness in the posterior aspect of the fetal neck. A nuchal fold (NF) measurement is obtained in a transverse section of the fetal head at the level of the cavum septum pellucidum and thalami, angled posteriorly to include the cerebellum. The measurement is taken from the outer edge of the occiput bone to the outer skin limit directly in the midline. An NF measurement greater than 5 mm at 14 to 17+6 weeks of gestation, or 6 mm at 18 to 28 weeks has been associated with a markedly increased risk for Down syndrome.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000474","HPO_Synonym__c":"Excess nuchal skin; Increased nuchal fold; Increased nuchal fold thickness; Thick nuchal fold; Thickened nuchal skin; Thickened skin folds of neck; Thickened skin over the neck","HPO_Name__c":"Thickened nuchal skin fold","HPO_Feature_Type__c":"Imaging_Ultrasound_Fetal"}}],"tags":{"Account":["Chromosomal Anomaly"],"Cause":["Chromosomal Anomaly","Genetics"],"Disease Category":["Genetics","Congenital Abnormality"],"Specialist":["Genetics","Pediatrics"]},"synonyms":["isochromosome 21"," tetrasomy type 21"]}