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. 1988 Oct;8(10):4342–4352. doi: 10.1128/mcb.8.10.4342

Microrecombinations generate sequence diversity in the murine major histocompatibility complex: analysis of the Kbm3, Kbm4, Kbm10, and Kbm11 mutants.

J Geliebter 1, S G Nathenson 1
PMCID: PMC365507  PMID: 3185552

Abstract

The mechanism that generates spontaneous mutants of the Kb histocompatibility gene was analyzed. Nucleotide sequence analysis of four mutant genes (Kbm3, Kbm4, Kbm10, and Kbm11) revealed that each mutant K gene contains clustered, multiple nucleotide substitutions. Hybridization analyses of parental B6 genomic DNA and cloned class I genes with mutant-specific oligonucleotide probes, followed by sequence analyses, have identified major histocompatibility complex class I genes in the K, D, and Tla regions (K1, Db, and T5, respectively) that contain the exact sequences as substituted into mutant Kb genes. These data provide evidence for the hypothesis that the mutant Kb genes are generated by a microrecombination (gene conversion) mechanism that results in the transfer of small DNA segments from class I genes of all four regions of the major histocompatibility complex (K, D, Qa, and Tla) to Kb. Many of the nucleotides substituted into the mutant Kb genes were identical to those found in other naturally occurring K alleles such as Kd. Thus, we propose that the accumulation of microrecombination products within the K genes of a mouse population is responsible for the high sequence diversity among H-2 alleles.

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Selected References

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