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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]
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 ...
The condition has been called progressive muscular atrophy (PMA), [7] spinal muscular atrophy (SMA), [7] Aran–Duchenne disease, [6] [7] Duchenne–Aran disease, [6] Aran–Duchenne muscular atrophy, [7] and Duchenne–Aran muscular atrophy. The name "spinal muscular atrophy" is ambiguous as it refers to any of various spinal muscular ...
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]
Congenital distal spinal muscular atrophy (cDSMA), also known as distal hereditary motor neuropathy (or neuronopathy) type VIII (dHMN8), is a hereditary medical condition characterized by muscle wasting (), particularly of distal muscles in legs and hands, and by early-onset contractures (permanent shortening of a muscle or joint) of the hip, knee, and ankle.
Molecular look into spinal muscular atrophy. Molecular genetic testing is the tool used to assess SMA. However, this test might not be needed if signs such as hypotonia are present. MRI scans and muscle biopsies used to be the standard testing method, but molecular testing is much more efficient.
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. [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.
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