First report of a molecular prenatal diagnosis in a tunisian family with lysinuric protein intolerance

Abstract

Lysinuric protein intolerance (LPI, MIM# 222700) is an inherited aminoaciduria caused by defective transport of cationic amino acids (CAAs; arginine, lysine, ornithine) at the basolateral membrane of epithelial cells in the intestine and kidney. We report the first prenatal diagnosis by direct mutational analysis of LPI performed in a Tunisian family. An amniotic fluid sample was carried out at 16 weeks of gestation in a 32-year-old Tunisian woman who consulted for prenatal diagnosis. The 1471 delTTCT mutation at homozygous state was identified indicating that the fetus was affected by LPI. The identification of this specific mutation provides a tool, which can be easily applied in Tunisia for molecular diagnosis, genetic counseling, and prenatal diagnosis of LPI.

Fig. 1

The sequence electropherogram of the sense strand in exon 9: an arrow indicates the position’s deletion. (a) The normal sequence from a control. (b) The heterozygous sequence from a patient’s parent. (c) The homozygote delTTCT present in patient