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Related Experiment Videos

Tissue-specific splicing mutation in acute intermittent porphyria.

B Grandchamp1, C Picat, V Mignotte

  • 1Laboratoire de Génétique Moléculaire, Faculté de Médecine X, Paris, France.

Proceedings of the National Academy of Sciences of the United States of America
|January 1, 1989
PubMed
Summary

A genetic mutation in porphobilinogen deaminase causes acute intermittent porphyria. This specific mutation restricts the enzyme deficiency to certain tissues, allowing for carrier detection in families.

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Area of Science:

  • Biochemistry
  • Genetics
  • Molecular Biology

Background:

  • Acute intermittent porphyria (AIP) is an autosomal dominant disease caused by inherited deficiency of porphobilinogen deaminase (PBG-D).
  • PBG-D deficiency is a heterogeneous disease, with different mutations identified at the protein level.
  • PBG-D is encoded by two tissue-specific mRNA species, transcribed from two promoters and differing in their first exon.

Purpose of the Study:

  • To identify and characterize mutations in the human porphobilinogen deaminase gene.
  • To investigate the molecular basis of a specific subtype of acute intermittent porphyria.
  • To develop methods for detecting asymptomatic carriers of PBG-D mutations.

Main Methods:

  • Analysis of genomic sequences of the human porphobilinogen deaminase gene.

Related Experiment Videos

  • Identification of mutations using oligonucleotide probes and in vitro amplification of genomic DNA.
  • Hybridization analysis to detect specific genetic alterations.

    • Main Results:

    • The first identified mutation in the human PBG-D gene is a G-to-A single-base substitution at the 5' splice donor site of intron 1.
    • This mutation results in a subtype of AIP where the enzymatic defect is restricted to nonerythropoietic tissues.
    • The study demonstrates the feasibility of detecting carriers using hybridization analysis.

    Conclusions:

    • A specific splice site mutation in the PBG-D gene causes a distinct form of AIP.
    • This mutation impacts tissue-specific expression of the enzyme.
    • Genetic analysis provides a means for identifying carriers within affected families, aiding in genetic counseling.