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PCR-based screening for the most prevalent alpha 1 antitrypsin deficiency mutations (PI S, Z, and Mmalton) in COPD

Sabri Denden1, Ramzi Lakhdar, Nadia Boudawara Keskes

  • 1Biochemistry and Molecular Biology Laboratory, Faculty of Pharmacy, Monastir, Tunisia, denden_sabri@yahoo.fr.

Biochemical Genetics
|May 14, 2013
PubMed

Insights

The PI*Mmalton allele is the most common cause of alpha 1 antitrypsin deficiency in Tunisia, particularly in the Mahdia region. Researchers developed a new, simpler genotyping method for this prevalent PI*Mmalton variant.

Area of Science:

  • Genetics
  • Pulmonology
  • Molecular Biology

Background:

  • Alpha 1 antitrypsin deficiency (AATD) is a genetic disorder affecting the lungs.
  • Protease inhibitor (PI) alleles PI*S and PI*Z are globally prevalent AATD variants.
  • However, the PI*Mmalton allele is more common in some Mediterranean populations.

Purpose of the Study:

  • To investigate the frequency of PI*S, PI*Z, and PI*Mmalton alleles in eastern Tunisia.
  • To develop and validate a novel, simplified genotyping method for the PI*Mmalton allele.

Main Methods:

  • Genotyping of PI*S and PI*Z alleles using RFLP-PCR (SexAI/Hpγ99I).
  • Development of a new mismatched RFLP-PCR method for PI*Mmalton genotyping.
  • Screening of 100 chronic obstructive pulmonary disease (COPD) patients in Mahdia, Tunisia.

Main Results:

  • The PI*Mmalton allele was identified as the most frequent AATD-related mutation in the studied Tunisian population.
  • The developed mismatched RFLP-PCR method for PI*Mmalton is suitable for routine clinical use and easy to reproduce.
  • Results align with previous findings from central Tunisia, reinforcing the prevalence of PI*Mmalton.

Conclusions:

  • The PI*Mmalton allele is the predominant AATD mutation in Tunisia.
  • The novel genotyping method offers a practical and accessible tool for clinical laboratories.
  • This research contributes to understanding AATD epidemiology in North Africa.

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