{"Name":"Spinocerebellar ataxia type 8","DiseaseID__c":"GARD:0004956","id":4956,"encodedName":"spinocerebellar-ataxia-type-8","IsDeleted":false,"Disease_Name_Full__c":"Spinocerebellar ataxia type 8","Xref_IDs__c":"715753001; C1837454; DOID:0050959; MEDGEN:332457; MONDO:0012116; NBK1268; OMIM:608768; ORPHA:98760","USA_Estimate__c":null,"No_of_Specialist_Tagsa__c":3,"No_of_ClinGen_records__c":0,"No_of_GeneReviews__c":1,"No_of_HHS_records__c":0,"World_Estimate__c":null,"No_of_HRSA_records__c":0,"Evidence_Based_Score__c":2,"No_of_Disease_Descriptions__c":3,"Disease_Characteristics_Score__c":8,"No_of_Age_at_Onset__c":1,"Description_Source__c":"MONDO:0012116","Disease_Description__c":"Spinocerebellar ataxia type 8 (SCA8) is a subtype of type I autosomal dominant cerebellar ataxia (ADCA type I; see this term) characterized by cerebellar ataxia and cognitive dysfunction in almost three quarters of patients and pyramidal and sensory signs in approximately a third of patients.","GARD_Name__c":"Spinocerebellar ataxia type 8","GARD_Synonym__c":"sca8","Curated_Disease_Description_Source__c":"GARD:0004956","Curated_Disease_Description__c":"Spinocerebellar ataxia type 8 (SCA8) is an inherited neurodegenerative condition characterized by slowly progressive ataxia (problems with movement, balance, and coordination). Common initial symptoms include dysarthria, slow speech, and trouble walking. Some affected individuals experience nystagmus and other abnormal eye movements. This condition is inherited in an autosomal dominant manner, although not all individuals with abnormalities in the disease-causing gene will develop the disease (called reduced penetrance).","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":null,"Age_at_Onset_Snippet_Text__c":"as an Adult","SourceID__c":"ORPHA:98760","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Entity","MONDO_ID__c":"MONDO:0012116","ORPHANET_ID__c":"ORPHA:98760","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Ataxia espinocerebelosa tipo 8","Spanish_Description_Source__c":"ORPHA:98760","Spanish_Description__c":"La ataxia espinocerebelosa tipo 8 (SCA8) es un subtipo de ataxia cerebelosa autosómica dominante tipo 1 (ADCA tipo I) caracterizada por ataxia cerebelosa y disfunción cognitiva en casi tres cuartos de los pacientes, y signos piramidales y sensoriales en aproximadamente una tercera parte de los mismos.","Spanish_Disease_Name__c":"ataxia espinocerebelosa tipo 8","Spanish_GARD_Synonym__c":"sca8","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":"Spinocerebellar ataxia type 8 (SCA8) is an inherited neurodegenerative condition characterized by slowly progressive ataxia (problems with movement, balance, and coordination). Common initial symptoms include dysarthria, slow speech, and trouble walking. Some affected individuals experience nystagmus and other abnormal eye movements. This condition is inherited in an autosomal dominant manner, although not all individuals with abnormalities in the disease-causing gene will develop the disease (called reduced penetrance).","Curated_Disease_Description_Source__c":"GARD:0004956","GARD_Synonym__c":"sca8","Name":"Spinocerebellar ataxia type 8","estimateUsa":""}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"National Ataxia Foundation","Website__c":"https://ataxia.org/"},{"Account_Name__c":"Ataxia UK","Website__c":"https://www.ataxia.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":"Psychiatry","Tag_Category__c":"Specialist"},{"Tag_Name__c":"Ataxia","Tag_Category__c":"Account","curated_tag_name":"Ataxia"}],"Age_At_Onset__c":[{"Age_At_Onset__c":"Adult","Provided_By__c":"ORPHA:98760"}],"Diagnosis__c":[{"Type__c":"GTR","Curie__c":"MEDGEN:C1837454"}],"External_Identifier_Disease__c":[{"URL__c":"https://raresource.nih.gov/diseases/filter/0004956","Source__c":"RareSource"},{"URL__c":"https://www.ncbi.nlm.nih.gov/books/NBK1138","Xref__c":"NBK1138"},{"URL__c":"https://www.ncbi.nlm.nih.gov/books/NBK1268","Source__c":"Gene Review","Xref__c":"NBK1268"},{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=715753001","Source__c":"C1837454; MONDO:0012116","Xref__c":"715753001"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=332457","Source__c":"C1837454","Xref__c":"MEDGEN:332457"},{"URL__c":"https://www.ebi.ac.uk/ols4/ontologies/doid/classes?obo_id=DOID%3A0050959","Source__c":"MONDO:0012116","Xref__c":"DOID:0050959"},{"URL__c":"https://www.orpha.net/en/disease/detail/98760","Source__c":"C1837454; MONDO:0012116; ORPHA:98760","Xref__c":"ORPHA:98760"},{"URL__c":"https://www.omim.org/entry/608768","Source__c":"C1837454; MONDO:0012116; ORPHA:98760","Xref__c":"OMIM:608768"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C1837454","Source__c":"C1837454","Xref__c":"C1837454"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0012116","Source__c":"GARD:0004956","Xref__c":"MONDO:0012116"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"ATXN8OS","Gene_Type__c":"non-coding RNA","Causal_Gene__c":true},{"GeneSymbol__c":"ATXN8","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["Autosomal dominant"],"GARD_Disease_Feature__c":[{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Underdevelopment of the pons.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0012110","HPO_Synonym__c":"Pontine hypoplasia","HPO_Name__c":"Hypoplasia of the pons","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A kind of ataxia that affects movements of the extremities.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002070","HPO_Synonym__c":"Appendicular ataxia","HPO_Name__c":"Limb ataxia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A type of dysarthria related to bilateral damage of the upper motor neuron tracts of the pyramidal and extra- pyramidal tracts. Speech of affected individuals is slow, effortful, and has a harsh vocal quality.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002464","HPO_Synonym__c":"Rigid dysarthria","HPO_Name__c":"Spastic dysarthria","Feature_System__c":"Nervous System; Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Cerebellar atrophy is defined as a cerebellum with initially normal structures, in a posterior fossa with normal size, which displays enlarged fissures (interfolial spaces) in comparison to the foliae secondary to loss of tissue. Cerebellar atrophy implies irreversible loss of tissue and result from an ongoing progressive disease until a final stage is reached or a single injury, e.g. an intoxication or infectious event.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001272","HPO_Synonym__c":"Atrophic cerebellum; Degeneration of cerebellum","HPO_Name__c":"Cerebellar atrophy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Inspiration of a foreign object into the airway.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002835","HPO_Name__c":"Aspiration","Feature_System__c":"Respiratory system","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","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:98760","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A decrease in the ability to perceive vibration. Clinically, this is usually tested with a tuning fork which vibrates at 128 Hz and is applied to bony prominences such as the malleoli at the ankles or the metacarpal-phalangeal joints. There is a slow decay of vibration from the tuning fork. The degree of vibratory sense loss can be crudely estimated by counting the number of seconds that the examiner can perceive the vibration longer than the patient.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002495","HPO_Synonym__c":"Decreased vibration sense; Decreased vibratory sense; Diminished vibratory sense; Hypopallesthesia; Impaired vibratory sensation; Impaired vibratory sense","HPO_Name__c":"Impaired vibratory sensation","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Frequent (30-79%)","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"}},{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Frequent (30-79%)","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:98760","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002317","HPO_Synonym__c":"Gait instability; Unsteady walk","HPO_Name__c":"Unsteady gait","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Loss of the ability to control the urinary bladder leading to involuntary urination.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000020","HPO_Synonym__c":"Bladder incontinence; Loss of bladder control","HPO_Name__c":"Urinary incontinence","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Inability to develop or maintain an erection of the penis.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000802","HPO_Synonym__c":"Difficulty getting a full erection; Difficulty getting an erection","HPO_Name__c":"Impotence","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A tendency to fall or the inability to keep oneself from falling; imbalance. The retropulsion test is widely regarded as the gold standard to evaluate postural instability, Use of the retropulsion test includes a rapid balance perturbation in the backward direction, and the number of balance correcting steps (or total absence thereof) is used to rate the degree of postural instability. Healthy subjects correct such perturbations with either one or two large steps, or without taking any steps, hinging rapidly at the hips while swinging the arms forward as a counterweight. In patients with balance impairment, balance correcting steps are often too small, forcing patients to take more than two steps. Taking three or more steps is generally considered to be abnormal, and taking more than five steps is regarded as being clearly abnormal. Markedly affected patients continue to step backward without ever regaining their balance and must be caught by the examiner (this would be called true retropulsion). Even more severely affected patients fail to correct entirely, and fall backward like a pushed toy soldier, without taking any corrective steps.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002172","HPO_Synonym__c":"Balance impairment","HPO_Name__c":"Postural instability","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","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:98760","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"An impairment of the ability to track objects with the ocular smooth pursuit system, a class of rather slow eye movements that minimizes retinal target motion.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007772","HPO_Synonym__c":"Abnormality of visual tracking; Impairment of visual pursuit","HPO_Name__c":"Impaired smooth pursuit","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Continuous involuntary sustained muscle contraction. When an affected muscle is passively stretched, the degree of resistance remains constant regardless of the rate at which the muscle is stretched. This feature helps to distinguish rigidity from muscle spasticity.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002063","HPO_Synonym__c":"Muscle rigidity; Rigidity","HPO_Name__c":"Rigidity","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An abnormally increased muscular tone that causes fixed abnormal postures. There is a slow, intermittent twisting motion that leads to exaggerated turning and posture of the extremities and trunk.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001332","HPO_Synonym__c":"Dystonic movements","HPO_Name__c":"Dystonia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Difficulty in swallowing.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002015","HPO_Synonym__c":"Difficulty swallowing; Poor swallowing; Swallowing difficulties; Swallowing difficulty","HPO_Name__c":"Dysphagia","Feature_System__c":"Nervous System; Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Bradykinesia literally means slow movement, and is used clinically to denote a slowness in the execution of movement (in contrast to hypokinesia, which is used to refer to slowness in the initiation of movement).","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002067","HPO_Synonym__c":"Slow movements; Slowness of movements","HPO_Name__c":"Bradykinesia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Hyperreflexia is the presence of hyperactive stretch reflexes of the muscles.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001347","HPO_Synonym__c":"Increased deep tendon reflexes; Increased reflexes","HPO_Name__c":"Hyperreflexia","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Wasting (atrophy) of the vermis of cerebellum.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0006855","HPO_Synonym__c":"Atrophy of cerebellar vermis; Atrophy of the cerebellar vermis; Vermian atrophy","HPO_Name__c":"Cerebellar vermis atrophy","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:98760","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:98760","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000273","HPO_Synonym__c":"Facial grimacing","HPO_Name__c":"Facial grimacing","HPO_Feature_Type__c":"Symptom"}}],"tags":{"Cause":["Genetics"],"Disease Category":["Genetics","Neurology"],"Specialist":["Genetics","Neurology","Psychiatry"],"Account":["Ataxia"]},"synonyms":["sca8"]}