High Levels of Polymorphism in Mouse Endogenous Retroviral Elements
Author Information
Author(s): Zhang Ying, Maksakova Irina A., Gagnier Liane, van de Lagemaat Louie N., Mager Dixie L.
Primary Institution: Terry Fox Laboratory, B.C. Cancer Research Centre, Vancouver, British Columbia, Canada
Hypothesis
What is the level of polymorphism of mouse endogenous retroviral sequences (ERVs) among different mouse strains?
Conclusion
The study found very high levels of polymorphism for two active families of ERVs in mice, suggesting they play a significant role in genetic variability among strains.
Supporting Evidence
- At least 60% of IAP and 25% of ETn/MusD elements detected in any strain are absent in one or more of the other three strains.
- Nearly 700 polymorphic IAP or ETn/MusD ERVs or solitary LTRs were identified that reside in gene introns.
- Evidence was found for decreased gene expression in strains carrying the insertion.
- Polymorphic ERVs may contribute to strain-specific traits and genetic drift.
Takeaway
Scientists looked at how different mouse strains have different versions of certain genes, and they found a lot of differences caused by tiny bits of virus DNA that got stuck in their genes.
Methodology
The researchers compared genomic sequences of four common mouse strains to assess the level of insertional polymorphism of ERVs.
Potential Biases
Potential biases may arise from the limited number of strains analyzed and the reliance on computational predictions for some insertions.
Limitations
The study was limited to only a few mouse strains, and many ERV insertions could not be detected due to incomplete sequence coverage.
Participant Demographics
The study involved four common inbred mouse strains: A/J, DBA/2J, 129X1/SvJ, and C57BL/6J.
Statistical Information
P-Value
0.4%
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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