{"Name":"Heterotopia, periventricular, X-linked dominant","DiseaseID__c":"GARD:0007371","id":7371,"encodedName":"heterotopia-periventricular-x-linked-dominant","IsDeleted":false,"Disease_Name_Full__c":"Heterotopia, periventricular, X-linked dominant","Xref_IDs__c":"448227009; C1848213; MEDGEN:376309; MONDO:0010233; OMIM:300049","USA_Estimate__c":null,"No_of_Specialist_Tagsa__c":0,"No_of_ClinGen_records__c":0,"No_of_GeneReviews__c":0,"No_of_HHS_records__c":0,"World_Estimate__c":null,"No_of_HRSA_records__c":0,"Evidence_Based_Score__c":0,"No_of_Disease_Descriptions__c":1,"Disease_Characteristics_Score__c":4,"No_of_Age_at_Onset__c":0,"Description_Source__c":"GARD:0007371","Disease_Description__c":"X-linked periventricular heterotopia or FLNA-related periventricular nodular heterotopia is a genetic disorder in which nerve cells in the brain do not migrate properly during early fetal development (a neuronal migration disorder). It is characterized by the presence of clumps of neurons near the brain's ventricles. Most people with this disorder are female, as it can be lethal in males. Intelligence is usually normal, but mild intellectual disability (including difficulty with reading and spelling) may occur. People with this condition also appear to be at increased risk for stroke and other vascular or coagulation (clotting) problems. Some people also have hyperflexible joints and vascular anomalies, which also occur in Ehlers-Danlos syndrome (EDS). X-linked periventricular heterotopia is caused by genetic changes in the FLNA gene and is inherited in an X-linked dominant manner. EDS with periventricular heterotopia, previously considered a variant of EDS, is now considered to be the same as X-linked periventricular heterotopia type 1 (PVNH1) and is not included as an EDS subtype under the 2017 classification of EDS.","GARD_Name__c":"Heterotopia, periventricular, X-linked dominant","GARD_Synonym__c":"heterotopia, periventricular, 1; heterotopia, periventricular, 1, x-linked dominant; heterotopia, periventricular, ehlers-danlos variant; periventricular nodular heterotopia 1; periventricular nodular heterotopia 4; pvnh1; x-linked periventricular heterotopia","Curated_Disease_Description_Source__c":"GARD:0007371 (on 6/12/23 updated and used ORPHA:98892)","Curated_Disease_Description__c":"Periventricular nodular heterotopia (PNH) is a brain malformation, due to abnormal neuronal migration, in which a subset of neurons fails to migrate into the developing cerebral cortex and remains as nodules that line the ventricular surface. Classical PNH is a rare X-linked dominant disorder far more frequent in females who present normal intelligence to borderline intellectual deficit, epilepsy of variable severity and extra-central nervous system signs, especially cardiovascular defects or coagulopathy. The disorder is generally associated with prenatal lethality in males.","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":null,"Age_at_Onset_Snippet_Text__c":null,"SourceID__c":"OMIM:300049","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0010233","ORPHANET_ID__c":null,"Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":null,"Spanish_Description_Source__c":null,"Spanish_Description__c":null,"Spanish_Disease_Name__c":null,"Spanish_GARD_Synonym__c":null,"Category_Linearization__c":null,"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":"Periventricular nodular heterotopia (PNH) is a brain malformation, due to abnormal neuronal migration, in which a subset of neurons fails to migrate into the developing cerebral cortex and remains as nodules that line the ventricular surface. Classical PNH is a rare X-linked dominant disorder far more frequent in females who present normal intelligence to borderline intellectual deficit, epilepsy of variable severity and extra-central nervous system signs, especially cardiovascular defects or coagulopathy. The disorder is generally associated with prenatal lethality in males.","Curated_Disease_Description_Source__c":"GARD:0007371 (on 6/12/23 updated and used ORPHA:98892)","GARD_Synonym__c":"heterotopia, periventricular, 1; heterotopia, periventricular, 1, x-linked dominant; heterotopia, periventricular, ehlers-danlos variant; periventricular nodular heterotopia 1; periventricular nodular heterotopia 4; pvnh1; x-linked periventricular heterotopia","Name":"Heterotopia, periventricular, X-linked dominant","estimateUsa":""}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"Epilepsy Foundation","Website__c":"https://www.epilepsy.com/"},{"Account_Name__c":"PVNH Support & Awareness","Website__c":"https://pvnhsupport.com/"}],"External_Identifier_Disease__c":[{"URL__c":"https://raresource.nih.gov/diseases/filter/0007371","Source__c":"RareSource"},{"URL__c":"https://www.ncbi.nlm.nih.gov/books/NBK1213","Source__c":"Gene Review","Xref__c":"NBK1213"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C1848213","Source__c":"C1848213","Xref__c":"C1848213"},{"URL__c":"https://www.omim.org/entry/300049","Source__c":"C1848213; MONDO:0010233","Xref__c":"OMIM:300049"},{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=448227009","Source__c":"C1848213; MONDO:0010233","Xref__c":"448227009"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=376309","Source__c":"C1848213","Xref__c":"MEDGEN:376309"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0010233","Source__c":"GARD:0007371","Xref__c":"MONDO:0010233"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"FLNA","GHR_URL__c":"https://medlineplus.gov/genetics/gene/flna","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["X-linked dominant"],"GARD_Disease_Feature__c":[{"Provided_By__c":"OMIM:300049","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Webbing or fusion of the fingers or toes, involving soft parts only or including bone structure. Bony fusions are referred to as \\\"bony\\\" syndactyly if the fusion occurs in a radio-ulnar axis. Fusions of bones of the fingers or toes in a proximo-distal axis are referred to as \\\"symphalangism\\\".","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001159","HPO_Synonym__c":"Webbed fingers or toes","HPO_Name__c":"Syndactyly","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300049","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Cerebellar hypoplasia is a descriptive term implying a cerebellum with a reduced volume, but a normal shape and is stable over time.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001321","HPO_Synonym__c":"Congenital cerebellar hypoplasia; Hypoplasia of cerebellum; Hypoplastic cerebellum; Small cerebellum; Underdeveloped cerebellum","HPO_Name__c":"Cerebellar hypoplasia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300049","Feature__r":{"HPO_Description__c":"Mild intellectual disability (ID) is defined as a type of ID characterized by mildly sub-average adaptive functioning and intellectual functioning, with an intelligence quotient (IQ) the range of 50-69.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001256","HPO_Synonym__c":"Intellectual disability, mild; Mental retardation, borderline-mild; Mild and nonprogressive mental retardation; Mild mental retardation","HPO_Name__c":"Mild intellectual disability","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300049","Feature__r":{"HPO_Description__c":"Heterotopia or neuronal heterotopia are macroscopic clusters of misplaced neurons (gray matter), most often situated along the ventricular walls or within the subcortical white matter.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002282","HPO_Synonym__c":"Gray matter heterotopias; Heterotopia; Heterotopias; Neuronal heterotopia","HPO_Name__c":"Gray matter heterotopia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300049","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An abnormally thin corpus callous, due to atrophy, hypoplasia or agenesis. This term is intended to be used in situations where it is not known if thinning of the corpus callosum (for instance, as visualized by magnetic resonance tomography) is due to abnormal development (e.g. a leukodystrophy) or atrophy following normal development (e.g. neurodegeneration).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0033725","HPO_Synonym__c":"Small corpus callosum; Thinning of the corpus callosum","HPO_Name__c":"Thin corpus callosum","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300049","Feature__r":{"HPO_Description__c":"An abnormality of the coagulation cascade, which is comprised of the contact activation pathway (also known as the intrinsic pathway) and the tissue factor pathway (also known as the extrinsic pathway) as well as cofactors and regulators.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003256","HPO_Synonym__c":"Coagulopathy","HPO_Name__c":"Abnormality of the coagulation cascade","Feature_System__c":"Blood and Blood-Forming Tissue","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300049","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":"OMIM:300049","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"The presence of an aortic valve with two instead of the normal three cusps (flaps). Bicuspid aortic valvue is a malformation of a commissure (small space between the attachment of each cusp to the aortic wall) and the adjacent parts of the two corresponding cusps forming a raphe (the fused area of the two underdeveloped cusps turning into a malformed commissure between both cusps; the raphe is a fibrous ridge that extends from the commissure to the free edge of the two underdeveloped, conjoint cusps).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001647","HPO_Synonym__c":"Aortic valve has two leaflets rather than three","HPO_Name__c":"Bicuspid aortic valve","Feature_System__c":"Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300049","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Hemorrhage into the parenchyma of the brain.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001342","HPO_Synonym__c":"Bleeding in brain; Intracerebral hemorrhage","HPO_Name__c":"Cerebral hemorrhage","Feature_System__c":"Nervous System; Cardiovascular System; Blood and Blood-Forming Tissue","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300049","HPO_Frequency__c":"Occasional (5-29%)","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":"OMIM:300049","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":"OMIM:300049","Feature__r":{"HPO_Description__c":"An abnormality resulting from an anomaly of neuronal migration, i.e., of the process by which neurons travel from their origin to their final position in the brain.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002269","HPO_Synonym__c":"Abnormal neuronal migration; Heterotopias/abnormal migration; Migrational brain disorder; Neuronal migration disorder","HPO_Name__c":"Abnormality of neuronal migration","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300049","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Abnormally short finger associated with developmental hypoplasia.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0009381","HPO_Synonym__c":"Hypoplastic digits; Hypoplastic fingers; Hypoplastic/small fingers; Short finger; Stubby finger; Stubby fingers","HPO_Name__c":"Short finger","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300049","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An angulation of a digit at an interphalangeal joint in the plane of the palm (finger) or sole (toe).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0030084","HPO_Synonym__c":"Permanent curving of the finger","HPO_Name__c":"Clinodactyly","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300049","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Increased susceptibility to infections as manifested by repeated bouts of infection.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002719","HPO_Synonym__c":"Frequent infections; Frequent, severe infections; Increased frequency of infection; infections, recurrent; Predisposition to infections; Recurrent infections; Susceptibility to infection","HPO_Name__c":"Recurrent infections","Feature_System__c":"Immune System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300049","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Sudden impairment of blood flow to a part of the brain due to occlusion or rupture of an artery to the brain.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001297","HPO_Synonym__c":"Cerebral vascular events; Cerebrovascular accident; Stroke","HPO_Name__c":"Stroke","Feature_System__c":"Nervous System; Cardiovascular System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"OMIM:300049","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Interruption of the procecss of diffferentiation of hematopoietic cells in the bone marrow, manifested by an increased proportion of immature cells in the bone marrow.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0033606","HPO_Synonym__c":"Hematopoietic maturation arrest","HPO_Name__c":"Bone marrow maturation arrest","Feature_System__c":"Blood and Blood-Forming Tissue","HPO_Feature_Type__c":"Symptom"}}],"tags":{},"synonyms":["heterotopia, periventricular, 1"," heterotopia, periventricular, 1, x-linked dominant"," heterotopia, periventricular, ehlers-danlos variant"," periventricular nodular heterotopia 1"," periventricular nodular heterotopia 4"," pvnh1"," x-linked periventricular heterotopia"],"spanishId":12725,"spanishName":"heterotopia-nodular-periventricular"}