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Related Experiment Video

Updated: Nov 16, 2025

Targeted Next-generation Sequencing and Bioinformatics Pipeline to Evaluate Genetic Determinants of Constitutional Disease

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Linker domain function predicts pathogenic MLH1 missense variants.

James London¹, Juana Martín-López¹, Inho Yang²

¹Department of Cancer Biology and Genetics, The Ohio State University Wexner Medical Center, Columbus, OH 43210.

Proceedings of the National Academy of Sciences of the United States of America

|February 23, 2021

Summary

This summary is machine-generated.

Understanding DNA mismatch repair (MMR) is crucial. This study reveals how HsMLH1-HsPMS2 forms a sliding clamp on DNA, clarifying MMR mechanisms and predicting mutation impacts.

Keywords:

HNPCC Lynch syndrome mismatch repair single molecule sliding clamp

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Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation

Published on: January 16, 2019

Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

The pathogenic impact of human HsMLH1 missense variants remains unclear due to limited understanding of its function in DNA mismatch repair (MMR).
MMR is a critical cellular pathway for maintaining genomic stability by correcting DNA replication errors.

Purpose of the Study:

To elucidate the functional mechanism of HsMLH1 in the context of MMR.
To provide a mechanistic basis for interpreting the clinical relevance of HsMLH1 missense mutations.

Main Methods:

Single-molecule imaging techniques were employed to visualize the interactions of MMR proteins.
Analysis focused on the assembly and dynamics of the HsMLH1-HsPMS2 complex on mismatched DNA.

Main Results:

Single-molecule imaging demonstrated that the HsMSH2-HsMSH6 complex acts as a platform facilitating the formation of a stable sliding clamp by the HsMLH1-HsPMS2 complex on mismatched DNA.
The observed mechanics of sliding clamp progression offer a solution to a key operational puzzle within the MMR pathway.

Conclusions:

The study reveals a novel mechanism for DNA mismatch repair involving a sliding clamp formed by HsMLH1-HsPMS2.
These findings provide a framework for predicting the pathogenicity of clinically relevant HsMLH1 missense mutations based on their impact on MMR function.