The present invention relates to the discovery of the human survival
motor-neuron gene or SMD gene, which is a chromosome 5-SMA (Spinal
Muscular Atrophy) determining gene. The present invention further relates
to the nucleotide sequence encoding the SMN gene and corresponding amino
acid sequence, a vector containing the gene encoding the SMN protein or a
DNA sequence corresponding to the gene and transformant strains
containing the SMN gene or a DNA sequence corresponding to the gene.