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Nucleic Acids Research, 1989, Vol. 17, No. 16 6637-6649
© 1989

ENZYMOLOGY

A point mutation G—A in exon 12 of the porphoblllnogen deaminase gene results in exon skipping and is responsible for acute intermittent porphyria

B. Grandchamp, C. Picat, F. de Rooij2, C. Beaumont, P. Wilson2, J.C. Deybach1 and Y. Nordmann1

Laboratoire de Génétique Moléculaire, Faculté de Méclecine X.Bichat 75018, Paris 1Laboratoire de Biochimie, Hdpital Louis Mourier 92701 Colombes, France 2Department of Internal Medicine, Erasmus University Rotterdam, The Netherlands

Received June 1, 1989. Revised July 24, 1989. Accepted July 24, 1989.

We have determined the mutation in a patient with acute intermittent porphyria. The mRNA coding for porphobilinogen deaminase was reverse transcribed then the CONA was enzymatically amplified in vitro. Upon sequencing of a polymerase chain reaction product of abnormal size we found that this fragment lacked exon 12 of the gene. We analysed a genomic fragment containing exon 12 and determined that the patient was heterozygous for a point mutation G A at the last position of exon 12. We propose that this base change is responsible for an abnormal processing of the mutant allele such that exon 12 is missing in the mature mRNA. The resulting abberant mRNA encodes a truncated protein which is inactive but stable and can be detected using antibodies directed against the normal enzyme.


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