{"Name":"Landau-Kleffner syndrome","DiseaseID__c":"GARD:0006855","id":6855,"encodedName":"landau-kleffner-syndrome","IsDeleted":false,"Disease_Name_Full__c":"Landau-Kleffner syndrome","Xref_IDs__c":"230438007; C0282512; C84806; D018887; DOID:2538; MEDGEN:79465; MONDO:0009509; ORPHA:98818","USA_Estimate__c":"5,000","No_of_Specialist_Tagsa__c":5,"No_of_ClinGen_records__c":0,"No_of_GeneReviews__c":0,"No_of_HHS_records__c":1,"World_Estimate__c":"8,000 to 80,000","No_of_HRSA_records__c":0,"Evidence_Based_Score__c":1,"No_of_Disease_Descriptions__c":5,"Disease_Characteristics_Score__c":8,"No_of_Age_at_Onset__c":1,"Description_Source__c":"MONDO:0009509","Disease_Description__c":"Landau-Kleffner syndrome (LKS) is a rare neurological syndrome characterized by the sudden or gradual development of aphasia (the inability to understand or express language) and recurrent seizures (epilepsy). Children with LKS typically develop normally until signs and symptoms of the syndrome begin to develop between age 2 and 8 years. Males are more often affected by LKS than females. In about 20% of people with LKS, mutations (changes) in the GRIN2A gene have been identified. The syndrome is inherited in an autosomal dominant manner. In other cases, the syndrome may be caused by changes to other unidentified genes. LKS is diagnosed when a doctor sees clinical features that are consistent with the syndrome such as a loss of speech and an electroencephalogram (EEG) that shows specific kinds of seizure activity. Genetic testing can be used to confirm if there is a mutation in GRIN2A, but this testing is not done routinely. Treatment for LKS usually consists of medications such as anticonvulsants and corticosteroids to help prevent seizures. Speech therapy should also be started promptly in order to ensure the best long-term outlook for children with LKS.","GARD_Name__c":"Landau-Kleffner syndrome","GARD_Synonym__c":"acquired epileptic aphasia; aphasia, acquired, with epilepsy; epilepsy, focal, with speech disorder and with or without impaired intellectual development; lks; lks - landau-kleffner syndrome","Curated_Disease_Description_Source__c":"GARD:0006855","Curated_Disease_Description__c":"Landau-Kleffner syndrome (LKS) is a rare nervous system disorder that begins in childhood. It is characterized by repeat seizures and a sudden or gradual inability to understand or express language (aphasia). LKS is diagnosed when a doctor sees clinical features that are consistent with the syndrome such as a loss of speech and an electroencephalogram (EEG) that shows specific kinds of seizure activity. The cause of Landau-Kleffner syndrome (LKS) is complex and can vary from patient to patient. Some cases may be the result of an autoimmune response that occurs when the body attacks itself as if it were an infection. Other cases have occurred in children with a GRIN2A gene variant. This gene provides instructions to make a protein that sends signals to the nerve cells in the brain. When the signals are not transmitted properly, they may affect the ability to understand or express language. These signals may also cause receptors in the brain to be turned on abnormally, resulting in seizures. However, not everyone with a GRIN2A gene variant develops LKS. Additional unknown genes and environmental factors may also play a role in causing LKS.","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":"5,000","Age_at_Onset_Snippet_Text__c":"as a Child","SourceID__c":"ORPHA:98818","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0009509","ORPHANET_ID__c":"ORPHA:98818","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Síndrome de landau-kleffner","Spanish_Description_Source__c":null,"Spanish_Description__c":null,"Spanish_Disease_Name__c":"síndrome de landau-kleffner","Spanish_GARD_Synonym__c":"afasia epiléptica adquirida; lks","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":"Landau-Kleffner syndrome (LKS) is a rare nervous system disorder that begins in childhood. It is characterized by repeat seizures and a sudden or gradual inability to understand or express language (aphasia). LKS is diagnosed when a doctor sees clinical features that are consistent with the syndrome such as a loss of speech and an electroencephalogram (EEG) that shows specific kinds of seizure activity. The cause of Landau-Kleffner syndrome (LKS) is complex and can vary from patient to patient. Some cases may be the result of an autoimmune response that occurs when the body attacks itself as if it were an infection. Other cases have occurred in children with a GRIN2A gene variant. This gene provides instructions to make a protein that sends signals to the nerve cells in the brain. When the signals are not transmitted properly, they may affect the ability to understand or express language. These signals may also cause receptors in the brain to be turned on abnormally, resulting in seizures. However, not everyone with a GRIN2A gene variant develops LKS. Additional unknown genes and environmental factors may also play a role in causing LKS.","Curated_Disease_Description_Source__c":"GARD:0006855","GARD_Synonym__c":"acquired epileptic aphasia; aphasia, acquired, with epilepsy; epilepsy, focal, with speech disorder and with or without impaired intellectual development; lks; lks - landau-kleffner syndrome","Name":"Landau-Kleffner syndrome","Curated_USA_Estimate__c":"5,000","estimateUsa":"5,000"}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"CureGRIN Foundation","Website__c":"https://curegrin.org/"},{"Account_Name__c":"GRIN-Portal","Website__c":"https://grin-portal.lalresearchgroup.org/"},{"Account_Name__c":"GRIN2B Foundation","Website__c":"http://grin2b.com/"},{"Account_Name__c":"CureGRIN","Website__c":"https://www.curegrin.org/"},{"Account_Name__c":"Epilepsy Foundation","Website__c":"https://www.epilepsy.com/"},{"Account_Name__c":"Epilepsy Action","Website__c":"https://www.epilepsy.org.uk/"}],"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":"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":"Childhood","Provided_By__c":"ORPHA:98818"}],"External_Identifier_Disease__c":[{"URL__c":"https://raresource.nih.gov/diseases/filter/0006855","Source__c":"RareSource"},{"URL__c":"https://www.ncbi.nlm.nih.gov/books/NBK385627","Source__c":"Gene Review","Xref__c":"NBK385627"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=79465","Source__c":"C0282512","Xref__c":"MEDGEN:79465"},{"URL__c":"https://www.ebi.ac.uk/ols4/ontologies/doid/classes?obo_id=DOID%3A2538","Source__c":"MONDO:0009509","Xref__c":"DOID:2538"},{"URL__c":"https://evsexplore.semantics.cancer.gov/evsexplore/concept/ncit/C84806","Source__c":"C0282512; MONDO:0009509","Xref__c":"C84806"},{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=230438007","Source__c":"C0282512; MONDO:0009509","Xref__c":"230438007"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C0282512","Source__c":"C0282512","Xref__c":"C0282512"},{"URL__c":"https://www.orpha.net/en/disease/detail/98818","Source__c":"C0282512; MONDO:0009509; ORPHA:98818","Xref__c":"ORPHA:98818"},{"URL__c":"https://www.ncbi.nlm.nih.gov/mesh/C018887","Source__c":"C0282512; MONDO:0009509","Xref__c":"D018887"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0009509","Source__c":"GARD:0006855","Xref__c":"MONDO:0009509"},{"URL__c":"https://medlineplus.gov/genetics/condition/epilepsy-aphasia-spectrum","Source__c":"GARD:0006855","Xref__c":"https://medlineplus.gov/genetics/condition/epilepsy-aphasia-spectrum"},{"URL__c":"https://evsexplore.semantics.cancer.gov/evsexplore/concept/ncit/C168598","Source__c":"C0282512","Xref__c":"C168598"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"GRIN2A","GHR_URL__c":"https://medlineplus.gov/genetics/gene/grin2a","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["Autosomal dominant"],"GARD_Disease_Feature__c":[{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An atypical absence seizure is a type of generalized non-motor (absence) seizure characterized by interruption of ongoing activities and reduced responsiveness. In comparison to a typical absence seizure, changes in tone may be more pronounced, onset and/or cessation may be less abrupt, and the duration of the ictus and post-ictal recovery may be longer. Although not always available, an EEG often demonstrates slow (<3 Hz), irregular, generalized spike-wave activity.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007270","HPO_Synonym__c":"Atypical absence; Atypical absence seizures; Atypical petit mal seizures","HPO_Name__c":"Atypical absence seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A type of focal-onset seizure characterized by a motor sign as its initial semiological manifestation.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011153","HPO_Synonym__c":"Focal motor seizures; Localized motor seizure; Localized motor seizures; Partial motor seizure; Partial motor seizures; Segmental motor seizure","HPO_Name__c":"Focal motor seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Uncommon (<1-4%)","Feature__r":{"HPO_Description__c":"A condition in which epileptiform abnormalities are believed to contribute to the progressive disturbance in cerebral function. Epileptic encephalaopathy is characterized by (1) electrographic EEG paroxysmal activity that is often aggressive, (2) seizures that are usually multiform and intractable, (3) cognitive, behavioral and neurological deficits that may be relentless, and (4) sometimes early death.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0200134","HPO_Synonym__c":"Convulsive encephalopathy","HPO_Name__c":"Epileptic encephalopathy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A bilateral tonic-clonic seizure with generalized onset is a type of bilateral tonic-clonic seizure characterized by generalized onset; these seizures rapidly engage networks in both hemispheres at the start of the seizure.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0025190","HPO_Synonym__c":"Generalised tonic-clonic seizure without focal onset; Generalised tonic-clonic seizure without partial onset; Generalised tonic-clonic seizures without focal onset; Generalised-onset tonic-clonic seizure; Generalized tonic-clonic seizure without focal onset; Generalized tonic-clonic seizure without partial onset; Generalized tonic-clonic seizures without focal onset; Generalized-onset tonic-clonic seizure; Primarily generalized tonic-clonic seizures; Primary generalized tonic-clonic seizure; Primary generalized tonic-clonic seizures","HPO_Name__c":"Bilateral tonic-clonic seizure with generalized onset","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Diffuse, bilateral and recently also unilateral or focal localization spike-wave occurring in slow sleep or non-rapid eye movement sleep.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0031491","HPO_Synonym__c":"CSWS; Electrical status epilepticus during slow-wave sleep","HPO_Name__c":"Continuous spike and waves during slow sleep","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Procedure_EEG"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A generalized non-motor (absence) seizure is a type of a type of dialeptic seizure that is of electrographically generalized onset. It is a generalized seizure characterized by an interruption of activities, a blank stare, and usually the person will be unresponsive when spoken to. Any ictal motor phenomena are minor in comparison to these non-motor features.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002121","HPO_Synonym__c":"Absence seizure; Absence seizures; Brief seizures with staring spells; Petit mal; Petit mal seizure; Petit mal seizures","HPO_Name__c":"Generalized non-motor (absence) seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003698","HPO_Synonym__c":"Difficulty in standing; Standing instability","HPO_Name__c":"Difficulty standing","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"EEG discharges recorded on the entire scalp typically seen in persons with epilepsy.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011198","HPO_Name__c":"EEG with generalized epileptiform discharges","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Procedure_EEG"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Generalized clonic seizure is a type of generalized motor seizure characterized by sustained bilateral jerking, either symmetric or asymmetric, that is regularly repetitive and involves the same muscle groups.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011169","HPO_Synonym__c":"Generalised clonic seizure; Generalised onset clonic seizure; Generalised-onset clonic seizure; Generalized clonic seizures; Generalized onset clonic seizure; Generalized-onset clonic seizure","HPO_Name__c":"Generalized clonic seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Language impairment is a deficit in comprehension or production of language that includes reduced vocabulary, limited sentence structure, or impairments in written or spoken communication. Language abilities are substantially and quantifiably below age expectations.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002463","HPO_Synonym__c":"Language disorder","HPO_Name__c":"Language impairment","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"A type of apraxia that is characterized by difficulty or inability to execute speech movements because of problems with coordination and motor problems, leading to incorrect articulation. An increase of errors with increasing word and phrase length may occur.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011098","HPO_Synonym__c":"Apraxia of speech; Verbal dyspraxia","HPO_Name__c":"Speech apraxia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Uncommon (<1-4%)","Feature__r":{"HPO_Description__c":"The presence of an antibody in the blood circulation that is directed against the organism's own cells or tissues.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0030057","HPO_Name__c":"Autoimmune antibody positivity","Feature_System__c":"Immune System","HPO_Feature_Type__c":"Lab"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Very frequent (80-99%)","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:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Acting on the spur of the moment or on a momentary basis without consideration of outcomes; having difficulty establishing or following plans; experiencing a sense of urgency and engaging in behavior that is uninhibited, cannot be inhibited, and is uncontrolled. The possibility of repression is inconceivable.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0100710","HPO_Synonym__c":"Impulsive; Impulsivity","HPO_Name__c":"Impulsivity","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Seizures that occur while the affected individual is sleeping.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0031951","HPO_Synonym__c":"Sleep seizures","HPO_Name__c":"Nocturnal seizures","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"EEG with focal sharp transient waves of a duration less than 80 msec in the frontal region.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012015","HPO_Name__c":"EEG with frontal focal spikes","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Procedure_EEG"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A type of focal motor seizure characterized by sudden, brief (<100 ms) involuntary single or multiple contraction(s) of muscles(s) or muscle groups of variable topography (axial, proximal limb, distal). Myoclonus is less regularly repetitive and less sustained than is clonus.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0011166","HPO_Synonym__c":"Focal myoclonic seizures; Local myoclonic seizures; Localised myoclonic seizure; Localized myoclonic seizure; Partial myoclonic seizure; Partial myoclonic seizures; Segmental myoclonic seizure; Segmental myoclonic seizures","HPO_Name__c":"Focal myoclonic seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Interictal refers to a period of time between epileptic seizures. Electroencephalographic (EEG) patterns are important in the differential diagnosis of epilepsy, and the EEG is almost always abnormal during a seizure. Some persons with seizures may show EEG abnormalities between seizures, while others do not. In some cases, multiple interictal EEGs must be recorded before an abnormality is observed. In most cases the electrographic pattern of seizure onset is completely different from the activity recorded during interictal discharge.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0025373","HPO_Name__c":"Interictal EEG abnormality","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Procedure_EEG"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"An acquired language impairment of some or all of the abilities to produce or comprehend speech and to read or write.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002381","HPO_Synonym__c":"Difficulty finding words; Losing words; Loss of words","HPO_Name__c":"Aphasia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Loss of developmental skills, as manifested by loss of developmental milestones.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002376","HPO_Synonym__c":"Loss of acquired milestones; Loss of developmental milestones; Loss of milestones; Mental deterioration in childhood; Neurodevelopmental regression; Psychomotor regression; Psychomotor regression beginning in infancy; Psychomotor regression in infants; Psychomotor regression, progressive","HPO_Name__c":"Developmental regression","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"EEG with focal sharp transient waves of a duration less than 80 msec in the temporal region.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012018","HPO_Name__c":"EEG with temporal focal spikes","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Procedure_EEG"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An impairment of memory as manifested by a reduced ability to remember things such as dates and names, and increased forgetfulness.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002354","HPO_Synonym__c":"Amnesia; Forgetfulness; Memory impairment; Memory loss; Memory problems; Poor memory","HPO_Name__c":"Memory impairment","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Abnormal coordination of muscles involved in speech.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001350","HPO_Synonym__c":"Slurred speech","HPO_Name__c":"Slurred speech","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Reduced ability of lexical discrimination, which refers to the process of distinguishing a stimulus word from other phonologically similar words. Lexical discrimination can be defined as the process of correctly identifying words in the mental lexicon to match the phonological input of a stimulus.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0030391","HPO_Name__c":"Spoken word recognition deficit","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Intense feelings of nervousness, tension, or panic often arise in response to interpersonal stresses. There is worry about the negative effects of past unpleasant experiences and future negative possibilities. Individuals may feel fearful, apprehensive, or threatened by uncertainty, and they may also have fears of falling apart or losing control.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000739","HPO_Synonym__c":"Anxiety; Anxiousness; Excessive, persistent worry and fear","HPO_Name__c":"Anxiety","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An abnormal pattern in the quality, quantity, or characteristics of sleep.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002360","HPO_Synonym__c":"Difficulty sleeping; Sleep abnormality; Sleep disturbances; Sleep dysfunction; Sleep-wake disturbance; Trouble sleeping","HPO_Name__c":"Sleep disturbance","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Attention deficit hyperactivity disorder (ADHD) manifests at age 2-3 years or by first grade at the latest. The main symptoms are distractibility, impulsivity, hyperactivity, and often trouble organizing tasks and projects, difficulty going to sleep, and social problems from being aggressive, loud, or impatient.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007018","HPO_Synonym__c":"ADHD; Attention deficit; Attention deficit disorder; Attention deficit-hyperactivity disorder; Attention deficits; Childhood attention deficit/hyperactivity disorder","HPO_Name__c":"Attention deficit hyperactivity disorder","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A type of status epilepticus without prominent motor symptoms in the absence of coma.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0032671","HPO_Name__c":"Non-convulsive status epilepticus without coma","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002371","HPO_Synonym__c":"Loss of speech","HPO_Name__c":"Loss of speech","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Unstable emotional experiences and frequent mood changes; emotions that are easily aroused, intense, and/or disproportionate to events and circumstances.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000712","HPO_Name__c":"Emotional lability","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An abnormal gait pattern that arises from weakness of the pretibial and peroneal muscles due to a lower motor neuron lesion. Affected patients have footdrop and are unable to dorsiflex and evert the foot. The leg is lifted high on walking so that the toes clear the ground, and there may be a slapping noise when the foot strikes the ground again.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0003376","HPO_Synonym__c":"High stepping","HPO_Name__c":"Steppage gait","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Persistent deficits in social interaction and communication and interaction as well as a markedly restricted repertoire of activity and interest as well as repetitive patterns of behavior.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000729","HPO_Synonym__c":"ASD; Pervasive developmental disorder","HPO_Name__c":"Autistic behavior","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Reduced attention span characterized by distractibility and impulsivity.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000736","HPO_Synonym__c":"Easily distracted; Easy distractibility; High distractibility; Poor attention span; Problem paying attention; Short attention span","HPO_Name__c":"Short attention span","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Atypical behavior is an abnormality in a person's actions that can be controlled or modulated by the will of the individual. While abnormal behaviors can be difficult to control, they are distinct from other abnormal actions that cannot be affected by the individual's will.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000708","HPO_Synonym__c":"Behavioral abnormality; Behavioral changes; Behavioral disorders; Behavioral disturbances; Behavioral problems; Behavioral symptoms; Behavioral/psychiatric abnormalities; Behavioural symptoms; Behavioural/Psychiatric abnormality; Psychiatric disorders; Psychiatric disturbances","HPO_Name__c":"Atypical behavior","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002359","HPO_Synonym__c":"Frequent falls","HPO_Name__c":"Frequent falls","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Complete lack of speech or verbal communication in a person despite attempts to engage in conversation. Mutism as a phenomena assumes the individual has previous capacity for speech and in the pediatric population it assumes that the person is past the age of typical language development.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002300","HPO_Synonym__c":"Inability to speak; Muteness","HPO_Name__c":"Mutism","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A bilateral tonic-clonic seizure is a seizure defined by a tonic (bilateral increased tone, lasting seconds to minutes) and then a clonic (bilateral sustained rhythmic jerking) phase.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002069","HPO_Synonym__c":"Bilateral convulsive seizures; Generalised tonic-clonic seizure (without specification of onset); Generalized convulsion; Generalized tonic-clonic seizure (without specification of onset); Grand mal; Grand mal seizures; Seizures, tonic-clonic; Tonic-clonic convulsion; Tonic-clonic convulsions","HPO_Name__c":"Bilateral tonic-clonic seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Focal impaired awareness seizure (or focal seizure with impaired or lost awareness) is a type of focal-onset seizure characterized by some degree (which may be partial) of impairment of the person's awareness of themselves or their surroundings at any point during the seizure.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002384","HPO_Synonym__c":"Complex focal seizures; Complex partial seizure; Complex partial seizures; Dyscognitive seizures; Focal dyscognitive seizure; Focal impaired awareness seizures; Focal seizure with impairment of awareness; Focal seizure with loss of awareness; Focal seizures with impairment of consciousness or awareness; Localised dyscognitive seizure; Localised seizure with impaired awareness; Localised seizure with loss of awareness; Localized dyscognitive seizure; Localized seizure with impaired awareness; Localized seizure with loss of awareness; Partial dyscognitive seizure; Partial seizure with impairment of awareness; Partial seizure with loss of awareness","HPO_Name__c":"Focal impaired awareness seizure","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Frequently experiencing feelings of being down, miserable, and/or hopeless; struggling to recover from these moods; having a pessimistic outlook on the future; feeling a pervasive sense of shame; having a low self-worth; experiencing thoughts of suicide and engaging in suicidal behavior.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000716","HPO_Synonym__c":"Depression; Depressive episode; Depressivity","HPO_Name__c":"Depression","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Behavior or an act aimed at harming a person, animal, or physical property (e.g., acts of physical violence; shouting, swearing, and using harsh language; slashing someone's tires).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000718","HPO_Synonym__c":"Aggression; Aggressive behavior; Aggressiveness","HPO_Name__c":"Aggressive behavior","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Hyperactivity is a condition characterized by constant and unusually high levels of activity, even in situations where it is deemed inappropriate.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000752","HPO_Synonym__c":"Hyperactive behavior; Hyperkinetic disorder; More active than typical","HPO_Name__c":"Hyperactivity","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007086","HPO_Name__c":"Social and occupational deterioration","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Impairment in the physical production of speech sounds.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0009088","HPO_Name__c":"Speech articulation difficulties","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98818","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A type of ataxia characterized by the impairment of the ability to coordinate the movements required for normal walking. Gait ataxia is characteirzed by a wide-based staggering gait with a tendency to fall.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002066","HPO_Synonym__c":"Ataxia of gait; Ataxic gait; Inability to coordinate movements when walking","HPO_Name__c":"Gait ataxia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}}],"tags":{"Cause":["Genetics"],"Disease Category":["Genetics","Neurology"],"Specialist":["Genetics","Neurology","Epilepsy","Neurodevelopmental disabilities","Pediatrics"],"Account":["Epilepsy"]},"synonyms":["acquired epileptic aphasia"," aphasia, acquired, with epilepsy"," epilepsy, focal, with speech disorder and with or without impaired intellectual development"," lks"," lks - landau-kleffner syndrome"]}