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ACMG Statements and Guidelines
These online statements and guidelines are definitive and may be cited using the digital object identifier (DOI). These recommendations are designed primarily as an educational resource for medical geneticists and other healthcare providers to help them provide quality medical genetics services; they should not be considered inclusive of all proper procedures and tests or exclusive of other procedures and tests that are reasonably directed to obtaining the same results. Please refer to the leading disclaimer in each document for more information.
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- ACMG-Practice-GuidelinesOpen Archive
Carrier screening for spinal muscular atrophy
Genetics in MedicineVol. 10Issue 11p840–842Published in issue: November, 2008- Thomas W. Prior
- for the Professional Practice and Guidelines Committee
Cited in Scopus: 179The autosomal recessive disorder proximal spinal muscular atrophy (SMA, MIM #253300) is a severe neuromuscular disease characterized by degeneration of alpha motor neurons in the spinal cord, which results in progressive proximal muscle weakness and paralysis. SMA is the second most common fatal autosomal recessive disorder after cystic fibrosis, with an estimated prevalence of 1 in 10,000 live births and a carrier frequency of 1/40–1/60. Childhood SMA is subdivided into three clinical groups on the basis of age of onset and clinical course: type I SMA (Werdnig-Hoffmann) is characterized by severe, generalized muscle weakness and hypotonia at birth or within the first 3 months.
