Alpha-N-acetylgalactosaminidase deficiency type 1
General Information (adopted from Orphanet):
Synonyms, Signs: |
SCHINDLER DISEASE, TYPE III, INCLUDED NAGA DEFICIENCY, TYPE III, INCLUDED NAGA DEFICIENCY, TYPE I ALPHA-N-ACETYLGALACTOSAMINIDASE DEFICIENCY, TYPE III, INCLUDED ALPHA-N-ACETYLGALACTOSAMINIDASE DEFICIENCY, TYPE I NEUROAXONAL DYSTROPHY, SCHINDLER TYPE Schindler disease type 1 NAGA deficiency type 1 |
Number of Symptoms | 54 |
OrphanetNr: | 79279 |
OMIM Id: |
609241
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ICD-10: |
E77.1 |
UMLs: |
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MeSH: |
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MedDRA: |
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Snomed: |
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Prevalence, inheritance and age of onset:
Prevalence: | No data available. |
Inheritance: |
Autosomal recessive [Orphanet] |
Age of onset: |
Neonatal Infancy [Orphanet] |
Disease classification (adopted from Orphanet):
Parent Diseases: |
Alpha-N-acetylgalactosaminidase deficiency
-Rare developmental defect during embryogenesis -Rare genetic disease -Rare neurologic disease |
Symptom Information:
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(HPO:0000639) | Nystagmus | Frequent [Orphanet] | 555 / 7739 | |||
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(HPO:0000486) | Strabismus | Frequent [Orphanet] | 576 / 7739 | |||
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(HPO:0100704) | Cortical visual impairment | 28 / 7739 | ||||
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(HPO:0000648) | Optic atrophy | 238 / 7739 | ||||
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(HPO:0000572) | Visual loss | Very frequent [Orphanet] | 272 / 7739 | |||
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(HPO:0000365) | Hearing impairment | Very frequent [Orphanet] | 539 / 7739 | |||
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(HPO:0003474) | Sensory impairment | Occasional [Orphanet] | 54 / 7739 | |||
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(HPO:0009830) | Peripheral neuropathy | Occasional [Orphanet] | 206 / 7739 | |||
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(HPO:0002376) | Developmental regression | 74 / 7739 | ||||
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(HPO:0001347) | Hyperreflexia | 363 / 7739 | ||||
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(HPO:0001257) | Spasticity | 251 / 7739 | ||||
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(HPO:0001276) | Hypertonia | Very frequent [Orphanet] | 317 / 7739 | |||
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(HPO:0000717) | Autism | Frequent [Orphanet] | 108 / 7739 | |||
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(HPO:0001250) | Seizures | 1245 / 7739 | ||||
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(HPO:0010864) | Intellectual disability, severe | 120 / 7739 | ||||
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(HPO:0000763) | Sensory neuropathy | Occasional [Orphanet] | 78 / 7739 | |||
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(HPO:0004305) | Involuntary movements | Frequent [Orphanet] | 50 / 7739 | |||
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(HPO:0002141) | Gait imbalance | Frequent [Orphanet] | 55 / 7739 | |||
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(HPO:0004374) | Hemiplegia/hemiparesis | Frequent [Orphanet] | 158 / 7739 | |||
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(HPO:0100543) | Cognitive impairment | Very frequent [Orphanet] | 230 / 7739 | |||
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(HPO:0007256) | Abnormal pyramidal signs | Very frequent [Orphanet] | 116 / 7739 | |||
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(HPO:0001336) | Myoclonus | 115 / 7739 | ||||
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(HPO:0000938) | Osteopenia | 138 / 7739 | ||||
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(HPO:0002240) | Hepatomegaly | Occasional [Orphanet] | 467 / 7739 | |||
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(HPO:0011276) | Vascular skin abnormality | Frequent [Orphanet] | 24 / 7739 | |||
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(HPO:0100585) | Telangiectasia of the skin | Frequent [Orphanet] | 66 / 7739 | |||
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(HPO:0000962) | Hyperkeratosis | Frequent [Orphanet] | 216 / 7739 | |||
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(HPO:0001638) | Cardiomyopathy | Occasional [Orphanet] | 192 / 7739 | |||
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(HPO:0001004) | Lymphedema | Occasional [Orphanet] | 62 / 7739 | |||
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(HPO:0003461) | Increased urinary O-linked sialopeptides | 5 / 7739 | ||||
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(HPO:0010547) | Muscle flaccidity | 466 / 7739 | ||||
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(HPO:0001252) | Muscular hypotonia | Very frequent [Orphanet] | 990 / 7739 | |||
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(HPO:0001324) | Muscle weakness | Very frequent [Orphanet] | 859 / 7739 | |||
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(HPO:0008947) | Infantile muscular hypotonia | 482 / 7739 | ||||
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(HPO:0003700) | Generalized amyotrophy | 39 / 7739 | ||||
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(OMIM) | Decreased alpha-N-acetylgalactosaminidase protein | 2 / 7739 | ||||
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(OMIM) | Rapid regression | 2 / 7739 | ||||
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(OMIM) | Normal early development, up to 8 to 15 months of age | 2 / 7739 | ||||
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(OMIM) | Increased urinary oligosaccharides | 2 / 7739 | ||||
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(HPO:0002334) | Abnormality of the cerebellar vermis | Occasional [Orphanet] | 137 / 7739 | |||
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(OMIM) | Limb contractures by age 4-5 years | 2 / 7739 | ||||
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(HPO:0002363) | Abnormality of brainstem morphology | Very frequent [Orphanet] | 14 / 7739 | |||
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(OMIM) | Lack of lysosomal inclusions in visceral organs | 2 / 7739 | ||||
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(OMIM) | 'Spheroid' inclusions in axons | 2 / 7739 | ||||
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(HPO:0012795) | Abnormality of the optic disc | Frequent [Orphanet] | 187 / 7739 | |||
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(OMIM) | No voluntary movement | 2 / 7739 | ||||
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(MedDRA:10045555) | Unresponsive to stimuli | 2 / 7739 | ||||
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(OMIM) | Delayed development, after 8-15 months | 2 / 7739 | ||||
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(OMIM) | Decreased alpha-N-acetylgalactosaminidase activity (less than 2% of control) | 2 / 7739 | ||||
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(OMIM) | Decorticate posturing | 2 / 7739 | ||||
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(OMIM) | Atrophy of cerebellum, brainstem, cervical spinal cord | 2 / 7739 | ||||
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(OMIM) | Neuroaxonal dystrophy | 4 / 7739 | ||||
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(HPO:0001522) | Death in infancy | Occasional [Orphanet] | 275 / 7739 | |||
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(HPO:0012758) | Neurodevelopmental delay | Very frequent [Orphanet] | 949 / 7739 |
Associated genes:
ClinVar (via SNiPA)
Gene symbol | Variation | Clinical significance | Reference |
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Additional Information:
Description: (OMIM) |
Alpha-N-acetylgalactosaminidase (NAGA) deficiency is a very rare lysosomal storage disorder. It is clinically heterogeneous with 3 main phenotypes: type I is an infantile-onset neuroaxonal dystrophy; type II, also known as Kanzaki disease (609242), is an adult-onset disorder characterized ... |
Clinical Description OMIM |
- Schindler Disease, Type I Van Diggelen et al. (1987, 1988) reported 2 sons of a German couple with remote consanguinity who were affected with type I lysosomal alpha-N-acetylgalactosaminidase deficiency. Starting at age 9 months, the ... |
Genotype-Phenotype Correlations OMIM |
Keulemans et al. (1996) found that the 3 related German boys with type I NAGA deficiency retained residual NAGA activity in fibroblasts that was higher than NAGA activity in 2 patients with the less severe adult-onset Kanzaki disease. ... |
Molecular genetics OMIM |
In the 2 German boys with alpha-N-acetylgalactosaminidase deficiency reported by van Diggelen et al. (1987, 1988), Wang et al. (1990) identified a homozygous glu325-to-lys (E325K) mutation in the NAGA gene (104170.0001). Keulemans et al. (1996) identified a distant ... |