Journal Article

Mutations in the Δ<sup>1</sup>-Pyrroline 5-Carboxylate Dehydrogenase Gene Cause Type II Hyperprolinemia

Michael T. Geraghty, D. Vaughn, A. J. Nicholson, Wei-Wen Lin, Gerardo Jimenez-Sanchez, Cassandra Obie, P. Flynn, David Valle and Chien-an A. Hu

in Human Molecular Genetics

Volume 7, issue 9, pages 1411-1415
Published in print September 1998 | ISSN: 0964-6906
Published online September 1998 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/7.9.1411
Mutations in the Δ1-Pyrroline 5-Carboxylate Dehydrogenase Gene Cause Type II Hyperprolinemia

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We surveyed Δ1-pyrroline 5-carboxylate dehydrogenase genes from four patients with hyperprolinemia type II using RT-PCR amplification, genomic PCR amplification and direct sequencing. We found four mutant alleles, two with frameshift mutations [A7fs(-1) and G521fs(+1)] and two with missense mutations (S352L and P16L). To test the functional consequences of three of these, we expressed them in a P5CDh-deficient strain of Saccharomyces cerevisiae. In contrast to wild-type human P5CDh, yeast expressing S352L and G521fs(+1) failed to grow on proline and had no detectable P5CDh activity. The P16L allele, however, produced fully functional P5CDh and subsequent analysis suggests that it is polymorphic in the relevant (Spanish) population. Interestingly, the G521fs(+1) allele segregates in the large Irish Traveller pedigree used to define the HPII phenotype. To our knowledge, this is the first description of the molecular basis for this inborn error.

Journal Article.  3307 words.  Illustrated.

Subjects: Genetics and Genomics

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