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The processive kinetics of gene conversion in bacteria.

Johan Paulsson1, Meriem El Karoui1,2, Monica Lindell3

  • 1Department of Systems Biology, Harvard University, Boston, MA, 02115, USA.

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|March 4, 2017
PubMed
Summary

Gene conversion, a key evolutionary process, was studied in Salmonella tuf genes. Findings reveal uniform initiation and processivity of gene conversion, regardless of mismatch repair status.

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Area of Science:

  • Evolutionary biology
  • Molecular genetics
  • Genomics

Background:

  • Gene conversion is crucial for gene family evolution and maintaining sequence similarity.
  • Key properties of gene conversion, including initiation sites, tract length, and mismatch repair influence, remain poorly understood.

Purpose of the Study:

  • To investigate the initiation and progression of gene conversion using Salmonella tuf genes as a model.
  • To determine the impact of mismatch repair on gene conversion tract characteristics.

Main Methods:

  • Utilized duplicate tuf genes in Salmonella as a model system for quantitative analysis of gene conversion.
  • Selected for gene conversion at various tuf gene positions.
  • Analyzed conversion tract distributions in both mismatch repair-deficient and proficient strains.

Main Results:

  • A stochastic model accurately predicted observed conversion tract distributions across different selection points.
  • The model's success relied on a single parameter: conversion processivity.
  • Gene conversion initiation was found to be uniform across the tuf gene.
  • Conversion processivity was uniform in both directions, limited by gene boundaries.

Conclusions:

  • Gene conversion in Salmonella tuf genes initiates uniformly and proceeds with consistent processivity.
  • Mismatch repair status does not significantly alter the fundamental processivity of gene conversion.
  • This study provides quantitative insights into the dynamics of gene conversion in a model system.