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Forward Genetic Approaches in Chlamydia trachomatis
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Host Genetic Risk Factors for Chlamydia trachomatis-Related Infertility in Women.

Xiaojing Zheng1,2, Wujuan Zhong2, Catherine M O'Connell1

  • 1Department of Pediatrics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.

The Journal of Infectious Diseases
|August 16, 2021
PubMed
Summary

Genetic variants linked to infertility may influence Chlamydia trachomatis (Ct) ascension, a key factor in upper genital tract infections and subsequent infertility. This study identifies specific genetic loci and mediator genes involved in this process.

Keywords:
GWASchlamydia diseasegenital tract ascensionhost geneticsinfertility

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Area of Science:

  • Reproductive immunology
  • Genetics of infectious diseases
  • Women's reproductive health

Background:

  • Chlamydia trachomatis (Ct) infection can ascend to the upper genital tract, leading to infertility.
  • Directly linking genetic variants to infertility is difficult due to diagnostic delays post-infection.
  • Studying the intermediate trait of Ct ascension provides a bridge to understanding genetic contributions to infertility.

Purpose of the Study:

  • To identify genetic variants (loci) associated with infertility.
  • To investigate the impact of these infertility-associated single-nucleotide polymorphisms (SNPs) on Ct ascension.
  • To explore whether these SNPs influence Ct ascension by modulating mediator gene expression.

Main Methods:

  • Utilized genome-wide association study (GWAS) data from women with tubal factor infertility and pelvic inflammatory disease.
  • Analyzed DNA and RNA from additional female cohorts with active Ct infection to assess SNP impact on Ct ascension.
  • Employed statistical mediation tests to determine if infertility SNPs jointly affect ascension risk via mediator gene expression.

Main Results:

  • Identified 112 candidate infertility GWAS loci, with 31 significantly associated with Ct ascension.
  • Discovered that specific SNPs modulate chlamydial ascension by altering the expression of 40 mediator genes.
  • Mediator genes are implicated in crucial innate immune responses, T-cell function, fibrosis, and reproductive tract health.

Conclusions:

  • Successfully identified genetic loci associated with Chlamydia trachomatis-related infertility.
  • Demonstrated potential functional roles for these loci in influencing Ct ascension through mediator gene pathways.
  • Findings offer insights into the genetic underpinnings of infertility linked to Chlamydia trachomatis infections.