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001-es BibID:BIBFORM106110
035-os BibID:(Scopus)85144296158
Első szerző:Tóth András (Budapest)
Cím:The genome loading model for the origin and maintenance of sex in eukaryotes / Tóth András, Székvölgyi Lóránt, Vellai Tibor
ISSN:2676-8615 2676-8607
Megjegyzések:Understanding why sexual reproduction-which involves syngamy (union of gametes) and meiosis-emerged and how it has subsisted for millions of years remains a fundamental problem in biology. Considered as the essence of sex, meiotic recombination is initiated by a DNA double-strand break (DSB) that forms on one of the pairing homologous chromosomes. This DNA lesion is subsequently repaired by gene conversion, the non-reciprocal transfer of genetic information from the intact homolog. A major issue is which of the pairing homologs undergoes DSB formation. Accumulating evidence shows that chromosomal sites where the pairing homologs locally differ in size, i.e., are heterozygous for an insertion or deletion, often display disparity in gene conversion. Biased conversion tends to duplicate insertions and lose deletions. This suggests that DSB is preferentially formed on the "shorter" homologous region, which thereby acts as the recipient for DNA transfer. Thus, sex primarily functions as a genome (re)loading mechanism. It ensures the restoration of formerly lost DNA sequences (deletions) and allows the efficient copying and, mainly in eukaryotes, subsequent spreading of newly emerged sequences (insertions) arising initially in an individual genome, even if they confer no advantage to the host. In this way, sex simultaneously repairs deletions and increases genetic variability underlying adaptation. The model explains a remarkable increase in DNA content during the evolution of eukaryotic genomes.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Adaptive gene combination
Biased gene conversion
DNA double-strand break
Genome size
Group selection
Individual advantage
Meiotic recombination
Origin of sex
Selfish DNA
Megjelenés:Biologia Futura. - 12 (2022), p. 1-20. -
További szerzők:Székvölgyi Lóránt (1977-) (biofizikus, biokémikus, sejtbiológus) Vellai Tibor
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