Structure of the SLC7A7 gene and mutational analysis of patients affected by lysinuric protein intolerance

Maria Pia Sperandeo, Maria Teresa Bassi, Mirko Riboni, Giancarlo Parenti, Anna Buoninconti, Marta Manzoni, Barbara Incerti, Maria Rosaria Larocca, Maja Di Rocco, Pietro Strisciuglio, Irma Dianzani, Rossella Parini, Miranda Candito, Fumio Endo, Andrea Ballabio, Generoso Andria, Gianfranco Sebastio, Giuseppe Borsani

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Abstract

Lysinuric protein intolerance (LPI) is a rare autosomal recessive defect of cationic amino acid transport caused by mutations in the SLC7A7 gene. We report the genomic structure of the gene and the results of the mutational analysis in Italian, Tunisian, and Japanese patients. The SLC7A7 gene consists of 10 exons; sequences of all of the exon-intron boundaries are reported here. All of the mutant alleles were characterized and eight novel mutations were detected, including two missense mutations, 242A→C (M1L) and 1399C→A (S386R); a nonsense mutation 967G→A (W242X); two splice mutations IVS3 +1G→A and IVS6 +1G→T; a single-base insertion, 786insT; and two 4-bp deletions, 455delCTCT and 1425delTTCT. In addition, a previously reported mutation, 1625insATCA, was found in one patient. It is noteworthy that 242A→C causes the change of Met to Leu, a rare mutational event previously found in a few inherited conditions. We failed to establish a genotype/phenotype correlation. In fact, both intrafamilial and interfamilial phenotypic variability were observed in homozygotes for the same mutation. The DNA-based tests are now easily accessible for molecular diagnosis, genetic counseling, and prenatal diagnosis of LPI.

Original languageEnglish
Pages (from-to)92-99
Number of pages8
JournalAmerican Journal of Human Genetics
Volume66
Issue number1
DOIs
Publication statusPublished - 2000

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ASJC Scopus subject areas

  • Genetics

Cite this

Sperandeo, M. P., Bassi, M. T., Riboni, M., Parenti, G., Buoninconti, A., Manzoni, M., Incerti, B., Larocca, M. R., Di Rocco, M., Strisciuglio, P., Dianzani, I., Parini, R., Candito, M., Endo, F., Ballabio, A., Andria, G., Sebastio, G., & Borsani, G. (2000). Structure of the SLC7A7 gene and mutational analysis of patients affected by lysinuric protein intolerance. American Journal of Human Genetics, 66(1), 92-99. https://doi.org/10.1086/302700