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Genomic instability due to V(D)J recombination-associated transposition.
Yeturu V R Reddy1, Eric J Perkins, Dale A Ramsden
1Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.
Genes & Development
|June 17, 2006
Summary
V(D)J recombination, crucial for immune receptor assembly, involves a transposon-like element. This element can integrate into host DNA, potentially causing genomic instability and contributing to oncogenic translocations.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- V(D)J recombination assembles immunoglobulin and T-cell receptors.
- The initial step resembles transposon excision, with potential for DNA integration.
- Genomic integrity risks from this process were previously unclear.
Purpose of the Study:
- To investigate the in vivo genomic integration of the V(D)J recombination transposon-like element.
- To assess the contribution of transposition to genomic instability during V(D)J recombination.
Main Methods:
- Analysis of DNA integrations in a pre-B-cell line.
- Identification and characterization of integrated V(D)J recombination elements.
Main Results:
- Observed integration of the V(D)J recombination transposon-like element into the pre-B-cell genome.
- Transposition accounted for one-third of observed integrations.
- Other integrations showed parallels to aberrant V(D)J recombination pathways linked to oncogenic translocation.
Conclusions:
- Transposition occurs at a significant frequency (approx. 1 in 50,000 V(D)J recombinations).
- Transposition represents a notable mechanism contributing to genomic instability during V(D)J recombination.