{"Name":"Isolated lissencephaly type 1 without known genetic defect","DiseaseID__c":"GARD:0018715","id":18715,"encodedName":"isolated-lissencephaly-type-1-without-known-genetic-defect","IsDeleted":false,"Disease_Name_Full__c":"Isolated lissencephaly type 1 without known genetic defect","Xref_IDs__c":"715406003; C4275151; MEDGEN:895946; MONDO:0015205; ORPHA:1084","USA_Estimate__c":null,"No_of_Specialist_Tagsa__c":5,"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":3,"Disease_Characteristics_Score__c":7,"No_of_Age_at_Onset__c":2,"Description_Source__c":"MONDO:0015205","Disease_Description__c":"Isolated lissencephaly type 1 without known genetic defects belongs to the genetically heterogeneous group, classic lissencephaly (see this term). It is a diagnosis of exclusion, when neither associated malformations nor family history are present, and in the absence of mutations of genes known to be involved in classic lissencephaly. Clinically patients present with the common features of classic lissencephaly such as developmental delay, intellectual disability, and seizures.","GARD_Name__c":"Isolated lissencephaly type 1 without known genetic defect","GARD_Synonym__c":"isolated lissencephaly type 1 without known genetic defects","Curated_Disease_Description_Source__c":"ORPHA:1084","Curated_Disease_Description__c":"Isolated lissencephaly type 1 without known genetic defects belongs to the genetically heterogeneous group, classic lissencephaly. It is a diagnosis of exclusion, when neither associated malformations nor family history are present, and in the absence of mutations of genes known to be involved in classic lissencephaly. Clinically patients present with the common features of classic lissencephaly such as developmental delay, intellectual disability, and seizures.","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":null,"Age_at_Onset_Snippet_Text__c":"as a Newborn and as an Infant","SourceID__c":"ORPHA:1084","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0015205","ORPHANET_ID__c":"ORPHA:1084","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Lisencefalia aislada tipo 1 sin anomalías genéticas conocidas","Spanish_Description_Source__c":"ORPHA:1084","Spanish_Description__c":"La lisencefalia tipo 1 aislada sin defectos genéticos conocidos pertenece al grupo genéticamente heterogéneo de la lisencefalia clásica. Es un diagnóstico de exclusión, cuando no existen malformaciones asociadas ni antecedentes familiares, y en ausencia de mutaciones de genes que se sabe están implicados en la lisencefalia clásica. Clínicamente, los pacientes presentan las características comunes de la lisencefalia clásica, como retraso del desarrollo, discapacidad intelectual y convulsiones.","Spanish_Disease_Name__c":"lisencefalia aislada tipo 1 sin anomalías genéticas conocidas","Spanish_GARD_Synonym__c":null,"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":"Isolated lissencephaly type 1 without known genetic defects belongs to the genetically heterogeneous group, classic lissencephaly. It is a diagnosis of exclusion, when neither associated malformations nor family history are present, and in the absence of mutations of genes known to be involved in classic lissencephaly. Clinically patients present with the common features of classic lissencephaly such as developmental delay, intellectual disability, and seizures.","Curated_Disease_Description_Source__c":"ORPHA:1084","GARD_Synonym__c":"isolated lissencephaly type 1 without known genetic defects","Name":"Isolated lissencephaly type 1 without known genetic defect","estimateUsa":""}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"Child Neurology Foundation","Website__c":"https://www.childneurologyfoundation.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":"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":"Epilepsy","Tag_Category__c":"Account;Specialist","curated_tag_name":"Epilepsy"},{"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:1084"},{"Age_At_Onset__c":"Infancy","Provided_By__c":"ORPHA:1084"}],"External_Identifier_Disease__c":[{"URL__c":"https://www.orpha.net/en/disease/detail/1084","Source__c":"C4275151; MONDO:0015205; ORPHA:1084","Xref__c":"ORPHA:1084"},{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=715406003","Source__c":"C4275151; MONDO:0015205","Xref__c":"715406003"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=895946","Source__c":"C4275151","Xref__c":"MEDGEN:895946"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C4275151","Source__c":"C4275151","Xref__c":"C4275151"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0015205","Source__c":"GARD:0018715","Xref__c":"MONDO:0015205"}],"GARD_Disease_Feature__c":[{"Provided_By__c":"ORPHA:1084","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An increase in size of the subarachnoid space associated with the lateral cerebral sulcus (Sylvian fissure).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0100952","HPO_Synonym__c":"Enlarged lateral fissure; Enlarged lateral sulcus; Enlarged sylvian fissure","HPO_Name__c":"Enlarged sylvian cistern","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:1084","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:1084","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A motor seizure is a type of seizure that is characterized at onset by involvement of the skeletal musculature. The motor event could consist of an increase (positive) or decrease (negative) in muscle contraction to produce a movement.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0020219","HPO_Name__c":"Motor seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:1084","HPO_Frequency__c":"Frequent (30-79%)","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:1084","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Neurodevelopmental delay (NDD) refers to delays in the maturation of the brain and central nervous system; infants and young children with NDD may experience delays in the development of one or more skills including gross motor abilities, fine-motor coordination, language abilities and ability to solve increasingly complex problems.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012758","HPO_Synonym__c":"NDD","HPO_Name__c":"Neurodevelopmental delay","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:1084","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A congenital abnormality of the cerebral hemisphere characterized by lack of gyrations (convolutions) of the cerebral cortex. Agyria is defined as cortical regions lacking gyration with sulci great than 3 cm apart and cerebral cortex thicker than 5 mm.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0031882","HPO_Synonym__c":"Agyria diffuse","HPO_Name__c":"Agyria","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:1084","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Hypsarrhythmia is abnormal interictal high amplitude waves and a background of irregular spikes. There is continuous (during wakefulness), high-amplitude (>200 Hz), generalized polymorphic slowing with no organized background and multifocal spikes demonstrated by electroencephalography (EEG).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002521","HPO_Synonym__c":"Hypsarrhythmia by EEG","HPO_Name__c":"Hypsarrhythmia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Procedure_EEG"}},{"Provided_By__c":"ORPHA:1084","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Muscular hypotonia (abnormally low muscle tone) manifesting in the neonatal period.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001319","HPO_Synonym__c":"Hypotonia, in neonatal onset; Hypotonia, neonatal; Low muscle tone, in neonatal onset","HPO_Name__c":"Neonatal hypotonia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:1084","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Infantile spasms represent a subset of \\\"epileptic spasms\\\". Infantile Spasms are epileptic spasms starting in the first year of life (infancy).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012469","HPO_Name__c":"Infantile spasms","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:1084","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A motor disorder characterized by a velocity-dependent increase in tonic stretch reflexes with increased muscle tone, exaggerated (hyperexcitable) tendon reflexes.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001257","HPO_Synonym__c":"Involuntary muscle stiffness, contraction, or spasm; Muscle spasticity; Muscular spasticity","HPO_Name__c":"Spasticity","Feature_System__c":"Nervous System; Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:1084","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Muscular hypotonia (abnormally low muscle tone) affecting the musculature of the trunk.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0008936","HPO_Synonym__c":"Low muscle tone in trunk; Muscular hypotonia of the trunk; Truncal hypotonia","HPO_Name__c":"Axial hypotonia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:1084","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Profound intellectual disability (ID) is defined as a type of ID characterized by profoundly sub-average adaptive functioning and intellectual functioning, with an intelligence quotient (IQ) below 20.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002187","HPO_Synonym__c":"Intellectual disability, profound; IQ less than 20; Mental retardation, profound; Profound mental retardation","HPO_Name__c":"Profound intellectual disability","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:1084","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"EEG with abnormal amplitude.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011201","HPO_Name__c":"EEG with changes in voltage","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Procedure_EEG"}},{"Provided_By__c":"ORPHA:1084","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). See also neuropathological definitions for 2-, 3-, and 4-layered lissencephaly.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001302","HPO_Synonym__c":"Cerebral pachygyria; Fewer and broader ridges in brain; Macrogyria","HPO_Name__c":"Pachygyria","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:1084","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An increase in size of the ventricular system of the brain.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002119","HPO_Synonym__c":"Cerebral ventricular dilatation; Dilated cerebral ventricle; Dilated cerebral ventricles; Dilated ventricles; Enlarged cerebral ventricles; Enlarged ventricles; Enlarged ventricular system; Large cerebral ventricles and cisternae; Ventricular dilatation","HPO_Name__c":"Ventriculomegaly","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:1084","HPO_Frequency__c":"Frequent (30-79%)","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":"ORPHA:1084","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"}}],"tags":{"Cause":["Genetics"],"Disease Category":["Genetics","Neurology","Congenital Abnormality"],"Specialist":["Genetics","Neurology","Epilepsy","Neurodevelopmental disabilities","Pediatrics"],"Account":["Epilepsy"]},"synonyms":["isolated lissencephaly type 1 without known genetic defects"]}