Phenotype | Clinical signs | CTG repeat size | Age of onset (years) | Age of death (years) |
Premutation | None | 35 to 49 | N/A | N/A |
Mild | Cataracts, mild myotonia | 50 to 150 | 20 to 70 | Normal life span |
Classical | Muscle weakness with respiratory failure, myotonia, cataracts, cardiac arrhythmias, EDS | 50 to 1000 | 10 to 30 | 48 to 60 |
Childhood onset | Psychosocial problems, low IQ, incontinence | >800 | 1 to 10 | N/A |
Congenital | Infantile hypotonia, respiratory failure, learning disability, feeding difficulty | >1000 | Birth | 45 (neonatal deaths not included) |
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