Genetic recombination is the molecular process by which segments of genetic material are rearranged or exchanged between DNA molecules, generating new combinations of alleles that differ from those of the parental sequences. It is a fundamental source of genetic diversity and a central mechanism for genome maintenan…
Genetic recombination is the molecular process by which segments of genetic material are rearranged or exchanged between DNA molecules, generating new combinations of alleles that differ from those of the parental sequences. It is a fundamental source of genetic diversity and a central mechanism for genome maintenance and repair. Homologous recombination exchanges sequence between molecules that share extensive identity, typically during meiosis, where programmed double-strand breaks are processed and resolved as crossovers or non-crossovers that shuffle linked loci and ensure accurate chromosome segregation. Site-specific recombination acts at defined short sequences to integrate, excise, or invert DNA, as in phage integration and immunoglobulin gene assembly, while transposition and illegitimate recombination relocate mobile elements or join non-homologous ends. In microbes and viruses, recombination between co-infecting genomes can reassort or rearrange coding regions and accelerate evolution, a process of particular interest in studies of viral phylogenetics and the comparative analysis of gene sequences. Mechanistically, recombination depends on conserved machinery for strand invasion, branch migration, and Holliday-junction resolution. Its outcomes underpin meiotic mapping, linkage analysis, plant and animal breeding, and genome-engineering strategies, making recombination essential both to inheritance and to the experimental manipulation of genomes.
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