hMMS2 serves a redundant role in human PCNA polyubiquitination
2008
MMS2's Role in PCNA Polyubiquitination
publication
Evidence: moderate
Author Information
Author(s): Brun, Chiu, Lockhart, Xiao, Wouters, Gray
Primary Institution: Centre for Cancer Therapeutics, Ottawa Health Research Institute
Hypothesis
MMS2 is essential for PCNA polyubiquitination in mammalian cells.
Conclusion
MMS2 serves a redundant role in the DNA damage tolerance pathway, suggesting the presence of another variant that can compensate for its loss.
Supporting Evidence
- Knockdown of MMS2 did not affect PCNA polyubiquitination after UV irradiation.
- Mouse embryonic stem cells lacking MMS2 maintained normal PCNA polyubiquitination.
- Combined knockdown of MMS2 and UEV1A did not disrupt PCNA polyubiquitination.
Takeaway
MMS2 is like a backup helper for fixing DNA, and even when it's not there, other helpers can still do the job.
Methodology
The study involved siRNA-mediated knockdown of MMS2 and UEV1A in human cells and analysis of PCNA polyubiquitination through immunoblotting.
Limitations
The study does not identify the specific redundant protein that compensates for MMS2.
Digital Object Identifier (DOI)
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