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Anthrax Susceptibility: Human Genetic Polymorphisms Modulating ANTXR2 Expression.

Zhang Zhang1, Yan Zhang2, Minglei Shi3

  • 1Beijing Institute of Biotechnology, No. 20, Dongdajie str., Fengtai District, Beijing 100071, China. zzhnng@yeah.net.

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Researchers identified genetic variations linked to anthrax toxin sensitivity. Specific SNPs in the ANTXR2 gene promoter influence its expression, explaining differences in susceptibility across populations.

Keywords:
ANTXR2anthrax toxingene structuregene transcriptiongenetic polymorphism

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Area of Science:

  • Genetics
  • Immunology
  • Molecular Biology

Background:

  • Anthrax toxin pathogenesis is mediated by anthrax toxin.
  • ANTXR2 (anthrax toxin receptor 2) expression levels correlate with anthrax toxin susceptibility.
  • Previous studies noted ethnic/geographical variations in ANTXR2 transcript abundance but lacked identified expression quantitative trait loci (eQTLs).

Purpose of the Study:

  • To identify cis-regulatory elements of ANTXR2.
  • To investigate the relationship between genetic variations and ANTXR2 expression.
  • To establish a link between human genetic variations and anthrax toxin sensitivity.

Main Methods:

  • Chromatin conformation capture (3C) to localize gene loci with cis-regulatory elements.
  • CRISPR-mediated genomic deletion to assess regulatory element function.
  • Dual-luciferase reporter assay to measure promoter activity.
  • Analysis of single nucleotide polymorphisms (SNPs) in the ANTXR2 promoter region.

Main Results:

  • Two SNPs (rs13140055 and rs80314910) within a CREB-binding motif in the ANTXR2 promoter were identified, modulating promoter activity.
  • These SNPs, along with a previously reported SNP (rs12647691), showed a statistically significant correlation with human genetic variations affecting anthrax toxin sensitivity.
  • The study localized cis-regulatory elements influencing ANTXR2 expression.

Conclusions:

  • Human genetic variations, specifically SNPs in the ANTXR2 promoter, significantly impact anthrax toxin susceptibility.
  • This research provides novel insights into the molecular mechanisms underlying individual differences in response to anthrax toxin.
  • The findings contribute to understanding population variability in ANTXR2 expression and its clinical implications for anthrax.