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Autosomal recessive proximal spinal muscular atrophy, responsible for 90-95% of cases and usually called simply spinal muscular atrophy (SMA) – a disorder associated with a genetic mutation on the SMN1 gene on chromosome 5q (locus 5q13), diagnosed predominantly in young children and in its most severe form being the most common genetic cause ...
Spinal muscular atrophy (SMA) is a rare neuromuscular disorder that results in the loss of motor neurons and progressive muscle wasting. [3] [4] [5] It is usually diagnosed in infancy or early childhood and if left untreated it is the most common genetic cause of infant death. [6]
XL-SMA is characterized by severe hypotonia and areflexia with loss of anterior horn cells in the spinal cord (i.e., lower motor neurons). [4] The disease course is similar to that in the most severe forms of classic autosomal recessive SMA caused by mutation of SMN1: SMA type 0 (SMA0) and SMA type I (SMA1). [ 4 ]
Spinal and bulbar muscular atrophy (SBMA), popularly known as Kennedy's disease, is a rare, adult-onset, X-linked recessive lower motor neuron disease caused by trinucleotide CAG repeat expansions in exon 1 of the androgen receptor (AR) gene, which results in both loss of AR function and toxic gain of function.
DSMA1 was identified and classified as a sub-group of spinal muscular atrophies (SMA) in 1974. [3] Currently, various classifications include DSMA1 either among spinal muscular atrophies or among distal hereditary motor neuropathies , though the latter has been argued to be more correct.
SMA-PME is associated with a missense mutation (c.125C→T) or deletion in exon 2 of the ASAH1 gene and is inherited in an autosomal recessive manner. [3] SMA-PME is closely related to a lysosomal disorder disease called Farber lipogranulomatosis. [4] As with many genetic disorders, there is no known cure for SMA-PME.
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Spinal type: Muscle weakness and atrophy as in other types of CMT, but set apart by being autosomal recessive inheritance. HMSN5: Charcot–Marie–Tooth with pyramidal features — 600361: Pyramidal type: onset between ages 5–12. Lower legs are affected first by muscle weakness and atrophy followed by the upper extremities.
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