The South African "bathing suit ichthyosis" is a form of lamellar ichthyosis caused by a homozygous missense mutation, p.R315L, in transglutaminase 1.
Arita K, Jacyk WK, Wessagowit V, van Rensburg EJ, Chaplin T, Mein CA, Akiyama M, Shimizu H, Happle R, McGrath JA. The South African "bathing suit ichthyosis" is a form of lamellar ichthyosis caused by a homozygous missense mutation, p.R315L, in transglutaminase 1. J Invest Dermatol. 2007 Feb; 127(2):490-3.