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Related Experiment Video

Updated: Jul 8, 2026

Preparation of the Mgm101 Recombination Protein by MBP-based Tagging Strategy

Preparation of the Mgm101 Recombination Protein by MBP-based Tagging Strategy

Published on: June 25, 2013

Mammalian SNM1 is required for genome stability.

A W Hemphill¹, D Bruun, L Thrun

¹Department of Molecular and Medical Genetics, Oregon Health & Sciences University, 3181 Sam Jackson Park Road, Portland, OR 97239, USA.

Molecular Genetics and Metabolism

|January 9, 2008

Summary

Human SNM1 (hSNM1) protein is crucial for repairing DNA interstrand crosslinks (ICLs). Studies show hSNM1 acts in a distinct pathway from Fanconi anemia, maintaining genome stability.

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Area of Science:

Genetics
Molecular Biology
DNA Repair Mechanisms

Background:

The Saccharomyces cerevisiae SNM1 protein is involved in DNA interstrand crosslinks (ICLs) repair.
Mammalian cells possess five SNM1 homologs, including Artemis, implicated in V(D)J recombination.
Mouse models with Snm1 gene disruption exhibit sensitivity to mitomycin (MMC), a DNA interstrand crosslinker.

Purpose of the Study:

To investigate the role of human SNM1 (hSNM1) and its homologs in ICL repair within human cells.
To determine if hSNM1 functions independently of the Fanconi anemia (FA) pathway.

Main Methods:

Utilized siRNA depletion in human fibroblasts to assess sensitivity to MMC.
Measured cell survival and chromosome radial formation as endpoints for DNA damage sensitivity.
Evaluated the epistatic relationship between hSNM1 and the FA pathway by depleting hSNM1 in FA cells.

Main Results:

Depletion of hSNM1 significantly increased sensitivity to ICLs, indicated by reduced cell survival and increased chromosome radials.
Depletion of Artemis did not affect sensitivity to ICLs.
Combined disruption of Snm1 and Fancd2 in mice led to partial perinatal lethality, suggesting genetic interaction.
Depleting hSNM1 in FA cells resulted in additive sensitivity to MMC.
Mono-ubiquitination of FANCD2, a marker for FA pathway activation, was unaffected by hSNM1 depletion in normal cells.

Conclusions:

hSNM1 plays a critical role in maintaining genome stability following ICL formation.
hSNM1 represents a DNA repair pathway for ICLs that is distinct from the Fanconi anemia pathway.