{"Name":"Spongy degeneration of central nervous system","DiseaseID__c":"GARD:0005984","id":5984,"encodedName":"spongy-degeneration-of-central-nervous-system","IsDeleted":false,"Disease_Name_Full__c":"Spongy degeneration of central nervous system","Xref_IDs__c":"423022130; 80544005; C0206307; C84611; D017825; DOID:3613; MEDGEN:61565; MONDO:0010079; OMIM:271900; ORPHA:141","USA_Estimate__c":"50,000","No_of_Specialist_Tagsa__c":4,"No_of_ClinGen_records__c":0,"No_of_GeneReviews__c":0,"No_of_HHS_records__c":3,"World_Estimate__c":"80,000 to 800,000","No_of_HRSA_records__c":0,"Evidence_Based_Score__c":3,"No_of_Disease_Descriptions__c":5,"Disease_Characteristics_Score__c":8,"No_of_Age_at_Onset__c":3,"Description_Source__c":"MONDO:0010079","Disease_Description__c":"Canavan disease (CD) is a neurodegenerative disorder; its spectrum varies between severe forms with leukodystrophy, macrocephaly and severe developmental delay, and a very rare mild/juvenile form characterized by mild developmental delay.","GARD_Name__c":"Spongy degeneration of central nervous system","GARD_Synonym__c":"acy2 deficiency; aminoacylase 2 deficiency; asp deficiency; aspa deficiency; aspartoacylase deficiency; canavan disease; canavan-van bogaert-bertrand disease; canavan-van-bogaert-bertrand disease; canavan's disease; spongiform leucodystrophy; spongy degeneration of the brain; spongy degeneration of white matter; spongy degeneration of white matter in infancy; von bogaert-bertrand disease","Curated_Disease_Description_Source__c":"GARD:0005984","Curated_Disease_Description__c":"Canavan disease is a rare inherited disorder that damages the ability of nerve cells (neurons) in the brain to send and receive messages. This disease is one of a group of genetic disorders called leukodystrophies. Leukodystrophies disrupt the growth or maintenance of the myelin sheath, which is the covering that protects nerves and promotes the efficient transmission of nerve impulses. Neonatal/infantile Canavan disease is the most common and most severe form of the condition. Affected infants appear normal for the first few months of life, but by age 3 to 5 months, problems with development become noticeable. These infants usually do not develop motor skills such as turning over, controlling head movement, and sitting without support. Other common features of this condition include weak muscle tone (hypotonia), an unusually large head size (macrocephaly), and irritability. Feeding and swallowing difficulties, seizures, and sleep disturbances may also develop. The mild/juvenile form of Canavan disease is less common. Affected individuals have mildly delayed development of speech and motor skills starting in childhood. These delays may be so mild and nonspecific that they are never recognized as being caused by Canavan disease. The life expectancy for people with Canavan disease varies. Most people with the neonatal/infantile form live only into childhood, although some survive into adolescence or beyond. People with the mild/juvenile form do not appear to have a shortened lifespan.","Curated_USA_Estimate_Source__c":null,"Curated_USA_Estimate__c":"50,000","Age_at_Onset_Snippet_Text__c":"from Birth to Childhood","SourceID__c":"ORPHA:141","Deprecated__c":"No","Disease_Concept_Type__c":"Rare Disease Grouping","MONDO_ID__c":"MONDO:0010079","ORPHANET_ID__c":"ORPHA:141","Replaced_By_ID__c":null,"Display_Spanish_Disease_Name__c":"Enfermedad de canavan","Spanish_Description_Source__c":"ORPHA:141","Spanish_Description__c":"La enfermedad de Canavan (EC) es un trastorno neurodegenerativo cuyo espectro varía entre formas graves con leucodistrofia, macrocefalia y retraso grave en el desarrollo, y una forma leve/juvenil muy poco frecuente caracterizada por un retraso leve del desarrollo.","Spanish_Disease_Name__c":"enfermedad de canavan","Spanish_GARD_Synonym__c":"deficiencia de acy2; deficiencia de aminoacilasa 2; deficiencia de aspartoacilasa; degeneración esponjosa del cerebro","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":"Canavan disease is a rare inherited disorder that damages the ability of nerve cells (neurons) in the brain to send and receive messages. This disease is one of a group of genetic disorders called leukodystrophies. Leukodystrophies disrupt the growth or maintenance of the myelin sheath, which is the covering that protects nerves and promotes the efficient transmission of nerve impulses. Neonatal/infantile Canavan disease is the most common and most severe form of the condition. Affected infants appear normal for the first few months of life, but by age 3 to 5 months, problems with development become noticeable. These infants usually do not develop motor skills such as turning over, controlling head movement, and sitting without support. Other common features of this condition include weak muscle tone (hypotonia), an unusually large head size (macrocephaly), and irritability. Feeding and swallowing difficulties, seizures, and sleep disturbances may also develop. The mild/juvenile form of Canavan disease is less common. Affected individuals have mildly delayed development of speech and motor skills starting in childhood. These delays may be so mild and nonspecific that they are never recognized as being caused by Canavan disease. The life expectancy for people with Canavan disease varies. Most people with the neonatal/infantile form live only into childhood, although some survive into adolescence or beyond. People with the mild/juvenile form do not appear to have a shortened lifespan.","Curated_Disease_Description_Source__c":"GARD:0005984","GARD_Synonym__c":"acy2 deficiency; aminoacylase 2 deficiency; asp deficiency; aspa deficiency; aspartoacylase deficiency; canavan disease; canavan-van bogaert-bertrand disease; canavan-van-bogaert-bertrand disease; canavan's disease; spongiform leucodystrophy; spongy degeneration of the brain; spongy degeneration of white matter; spongy degeneration of white matter in infancy; von bogaert-bertrand disease","Name":"Spongy degeneration of central nervous system","Curated_USA_Estimate__c":"50,000","estimateUsa":"50,000"}],"Organization_Supported_Diseases__c":[{"Account_Name__c":"Cure Canavan Fund","Website__c":"https://www.curecanavanfund.org/"},{"Account_Name__c":"Childhood Dementia Initiative","Website__c":"https://www.childhooddementia.org/"},{"Account_Name__c":"Canavan Foundation","Website__c":"https://www.canavanfoundation.org"},{"Account_Name__c":"Canavan Research Foundation","Website__c":"https://www.canavan.org/"},{"Account_Name__c":"Canavan Research Illinois","Website__c":"https://www.canavanresearch.org"},{"Account_Name__c":"Cure Rare Disease","Website__c":"https://www.cureraredisease.org"},{"Account_Name__c":"National Tay-Sachs and Allied Diseases Association","Website__c":"https://www.ntsad.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":"Inborn Errors of Metabolism","Tag_Category__c":"Cause;Disease Category","category_description":"Inherited metabolic diseases, or inborn errors of metabolism, are a group of genetic diseases that affect the ability of the body's cells to convert food into energy.","curated_tag_name":"Inherited metabolic diseases"},{"Tag_Name__c":"Leukodystrophy","Tag_Category__c":"Account;Cause;Disease Category","category_description":"Leukodystrophies are a group of genetic neurological diseases that affect the white matter of the brain and spinal cord.","curated_tag_name":"Leukodystrophies"},{"Tag_Name__c":"Epilepsy","Tag_Category__c":"Account;Specialist","curated_tag_name":"Epilepsy"},{"Tag_Name__c":"Pediatrics","Tag_Category__c":"Specialist"}],"Age_At_Onset__c":[{"Age_At_Onset__c":"Neonatal","Provided_By__c":"ORPHA:141"},{"Age_At_Onset__c":"Childhood","Provided_By__c":"ORPHA:141"},{"Age_At_Onset__c":"Infancy","Provided_By__c":"ORPHA:141"}],"Diagnosis__c":[{"Type__c":"GTR","Curie__c":"MEDGEN:C0206307"}],"External_Identifier_Disease__c":[{"URL__c":"https://www.ncbi.nlm.nih.gov/books/NBK1234","Source__c":"Gene Review","Xref__c":"NBK1234"},{"URL__c":"https://uts.nlm.nih.gov/uts/umls/concept/C0206307","Source__c":"C0206307","Xref__c":"C0206307"},{"URL__c":"https://www.ncbi.nlm.nih.gov/mesh/C017825","Source__c":"C0206307; MONDO:0010079","Xref__c":"D017825"},{"URL__c":"https://www.ebi.ac.uk/ols4/ontologies/doid/classes?obo_id=DOID%3A3613","Source__c":"MONDO:0010079","Xref__c":"DOID:3613"},{"URL__c":"https://www.ncbi.nlm.nih.gov/medgen/?term=61565","Source__c":"C0206307","Xref__c":"MEDGEN:61565"},{"URL__c":"https://browser.ihtsdotools.org/?perspective=full&conceptId1=80544005","Source__c":"C0206307; MONDO:0010079","Xref__c":"80544005"},{"URL__c":"https://evsexplore.semantics.cancer.gov/evsexplore/concept/ncit/C84611","Source__c":"C0206307; MONDO:0010079","Xref__c":"C84611"},{"URL__c":"https://www.omim.org/entry/271900","Source__c":"C0206307; MONDO:0010079; ORPHA:141","Xref__c":"OMIM:271900"},{"URL__c":"https://www.orpha.net/en/disease/detail/141","Source__c":"C0206307; MONDO:0010079; ORPHA:141","Xref__c":"ORPHA:141"},{"URL__c":"http://purl.obolibrary.org/obo/MONDO_0010079","Source__c":"GARD:0005984","Xref__c":"MONDO:0010079"},{"URL__c":"https://medlineplus.gov/genetics/condition/canavan-disease","Source__c":"GARD:0005984","Xref__c":"https://medlineplus.gov/genetics/condition/canavan-disease"},{"URL__c":"https://secure.ssa.gov/apps10/poms.nsf/lnx/0423022130","Xref__c":"423022130"},{"URL__c":"https://ntsad.org/about-ntsad/fda-engagement/"}],"GARD_Disease_Gene__c":[{"GeneSymbol__c":"ASPA","GHR_URL__c":"https://medlineplus.gov/genetics/gene/aspa","Gene_Type__c":"protein-coding gene","Causal_Gene__c":true}],"Inheritance__c":["Autosomal recessive"],"GARD_Disease_Feature__c":[{"Provided_By__c":"ORPHA:141","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"Any deviation from the normal pigmentation of the retina.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0007703","HPO_Synonym__c":"Abnormality of retinal pigment epithelium; Abnormality of retinal pigmentation; Abnormality of RPE; Retinal pigmentary anomaly","HPO_Name__c":"Abnormal retinal pigmentation","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:141","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Abnormal cognition is characterized by deficits in thinking, reasoning, or remembering.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0100543","HPO_Synonym__c":"Abnormality of cognition; Cognitive abnormality; Cognitive defects; Cognitive deficits; Cognitive impairment; Intellectual impairment","HPO_Name__c":"Cognitive impairment","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:141","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Atrophy of the optic nerve. Optic atrophy results from the death of the retinal ganglion cell axons that comprise the optic nerve and manifesting as a pale optic nerve on fundoscopy.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000648","HPO_Synonym__c":"Optic nerve atrophy; Optic-nerve degeneration","HPO_Name__c":"Optic atrophy","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:141","HPO_Frequency__c":"Occasional (5-29%)","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:141","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Impaired feeding performance of an infant as manifested by difficulties such as weak and ineffective sucking, brief bursts of sucking, and falling asleep during sucking. There may be difficulties with chewing or maintaining attention.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0008872","HPO_Name__c":"Feeding difficulties in infancy","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:141","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Abnormality observed by electroencephalogram (EEG), which is used to record of the brain's spontaneous electrical activity from multiple electrodes placed on the scalp.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002353","HPO_Synonym__c":"Abnormal EEG; Abnormal electroencephalogram; EEG abnormalities; Electroencephalogram abnormal; Electroencephalogram abnormalities","HPO_Name__c":"EEG abnormality","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Procedure_EEG"}},{"Provided_By__c":"ORPHA:141","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Blindness is the condition of lacking visual perception defined as a profound reduction in visual perception. On the 6m visual acuity scale, blindness is defined as less than 3/60. On the 20ft visual acuity scale, blindness is defined as less than 20/400. On the decimal visual acuity scale, blindness is defined as less than 0.05. Blindness is typically characterized by a visual field of no greater than 10 degrees in radius around central fixation.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000618","HPO_Synonym__c":"Blindness; Total vision loss","HPO_Name__c":"Blindness","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:141","HPO_Frequency__c":"Occasional (5-29%)","Feature__r":{"HPO_Description__c":"A flexion contracture is a bent (flexed) joint that cannot be straightened actively or passively. It is thus a chronic loss of joint motion due to structural changes in muscle, tendons, ligaments, or skin that prevents normal movement of joints.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001371","HPO_Synonym__c":"Flexed joint that cannot be straightened; Flexion contractures; Flexion contractures of joints","HPO_Name__c":"Flexion contracture","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:141","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Visual impairment (or vision impairment) is vision loss (of a person) to such a degree as to qualify as an additional support need through a significant limitation of visual capability resulting from either disease, trauma, or congenital or degenerative conditions that cannot be corrected by conventional means, such as refractive correction, medication, or surgery.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000505","HPO_Synonym__c":"Impaired vision; Loss of eyesight; Poor vision; Visual impairment","HPO_Name__c":"Visual impairment","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:141","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A decreased magnitude of the sensory perception of sound.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000365","HPO_Synonym__c":"Deafness; Hearing defect; Hearing impairment; Hypacusis","HPO_Name__c":"Hearing impairment","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:141","HPO_Frequency__c":"Occasional (5-29%)","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:141","HPO_Frequency__c":"Very frequent (80-99%)","Feature__r":{"HPO_Description__c":"Abnormally diminished level of attention, responsiveness, or wakefulness.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0004372","HPO_Synonym__c":"Disturbances of consciousness; Lowered consciousness; Reduced consciousness/confusion","HPO_Name__c":"Reduced consciousness","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:141","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"Occipitofrontal (head) circumference greater than 97th centile compared to appropriate, age matched, sex-matched normal standards. Alternatively, a apparently increased size of the cranium.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000256","HPO_Synonym__c":"Increased size of cranium; Increased size of skull; Large head; Large head circumference; Macrocephalus; Macrocrania; Megacephaly","HPO_Name__c":"Macrocephaly","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:141","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A condition in which the stomach contents leak backwards from the stomach into the esophagus through the lower esophageal sphincter.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0002020","HPO_Synonym__c":"Acid reflux; Acid reflux disease; Gastro-esophageal reflux; Gastroesophageal reflux disease; GERD; GORD; Heartburn","HPO_Name__c":"Gastroesophageal reflux","Feature_System__c":"Digestive System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:141","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"A condition in which there is increased muscle tone so that arms or legs, for example, are stiff and difficult to move.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0001276","HPO_Synonym__c":"Hypertonicity; Increased muscle tone","HPO_Name__c":"Hypertonia","Feature_System__c":"Musculoskeletal System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:141","HPO_Frequency__c":"Frequent (30-79%)","Feature__r":{"HPO_Description__c":"An anomaly of visually evoked potentials (VEP), which are electrical potentials, initiated by brief visual stimuli, which are recorded from the scalp overlying the visual cortex.","HPO_Feature_URL__c":"https://hpo.jax.org/browse/term/HP:0000649","HPO_Synonym__c":"Abnormal vision evoked potentials; Abnormal visual evoked potential; Abnormal visual evoked responses; Abnormal visual-evoked potentials; VEP abnormalities","HPO_Name__c":"Abnormality of visual evoked potentials","Feature_System__c":"Nervous System","HPO_Feature_Type__c":"Symptom"}},{"Provided_By__c":"ORPHA:141","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:141","HPO_Frequency__c":"Very frequent (80-99%)","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"}}],"tags":{"Cause":["Genetics","Inborn Errors of Metabolism","Leukodystrophy"],"Disease Category":["Genetics","Neurology","Inborn Errors of Metabolism","Leukodystrophy"],"Specialist":["Genetics","Neurology","Epilepsy","Pediatrics"],"Account":["Leukodystrophy","Epilepsy"]},"synonyms":["acy2 deficiency"," aminoacylase 2 deficiency"," asp deficiency"," aspa deficiency"," aspartoacylase deficiency"," canavan disease"," canavan-van bogaert-bertrand disease"," canavan-van-bogaert-bertrand disease"," canavan's disease"," spongiform leucodystrophy"," spongy degeneration of the brain"," spongy degeneration of white matter"," spongy degeneration of white matter in infancy"," von bogaert-bertrand disease"]}