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Published on: February 3, 2013
Evidence for gene recombination in FCGR3 gene variants
1Institute of Transfusion Medicine, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany.
Researchers identified 12 new genomic variations in Fc gamma receptor (FcgammaR) genes, FCGR3A and FCGR3B, with evidence suggesting somatic recombination as a cause for some FcgammaR variants.
Area of Science:
- Immunogenetics
- Molecular Biology
Background:
- Fc gamma receptor (FcgammaR) genes FCGR3A and FCGR3B are located on chromosome 1q23-24.
- These genes exhibit known allelic polymorphism.
Purpose of the Study:
- To investigate the molecular basis of novel genomic variations in FCGR3 genes.
- To identify new FCGR3 genomic variants and understand their origin.
Main Methods:
- Cloning and sequencing of a shared FCGR3A/FCGR3B exon segment from 30 donors and 3 BAC clones.
- Sequencing of a mixture of FCGR3B*2- and FCGR3A- plasmids.
- Screening nucleotide databases for variant FCGR3 sequences.
Main Results:
- Detection of 12 FCGR3 variants based on polymorphic positions in genomic DNA.
- Variants were found in 23 of 24 donors positive for FCGR3B*2 and/or FCGR3B*3.
- Variants were also identified in BAC clones and plasmid DNA mixtures.
Conclusions:
- Non-random nucleotide exchanges characterize the identified FCGR3 variants.
- Evidence suggests somatic recombination as the origin for at least two variants.
- PCR artifacts are a potential, though less likely, source for some new variants.
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