The autosomal recessive SMA caused by mutation of SMN gene present on chromosome 5q13 comprises 95% of all SMA. SMA is mainly classified into three broad<unk>  <unk> I –<unk> III) based on the clinical severity and prognosis. Two more<unk> of SMA,<unk> 0 and<unk> IV have been recently defined. The different<unk>  of SMA have a clinical continuum.
Spinal muscular atrophy types
Spinal muscular atrophy other forms
Distal spinal muscular atrophy type 1
Kennedy disease
Hereditary spastic paraplegia
Naxos disease
Loken Senior syndrome
Becker's muscular dystrophy