SPTLC1 mutation in twin sisters with hereditary sensory neuropathy type I

Hereditary sensory neuropathy type I (HSN I) is an autosomal dominant ulceromutilating disorder of the peripheral nervous system characterized by progressive sensory loss. HSN I locus maps to chromosome 9q22.1-22.3 and is caused by mutations in the gene coding for serine palmitoyltransferase long-chain base subunit 1 (SPTLC1). A novel missense mutation in exon 13 of the SPTLC1 gene ( c. 1160G-->G p. G387A) in twin sisters with a severe HSN I phenotype is reported.