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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I,...
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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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Recombination between heterologous human acrocentric chromosomes.

Andrea Guarracino1,2, Silvia Buonaiuto3, Leonardo Gomes de Lima4

  • 1Department of Genetics, Genomics and Informatics, University of Tennessee Health Science Center, Memphis, TN, USA.

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Human acrocentric chromosomes contain pseudo-homologous regions (PHRs) that indicate recombination between non-homologous sequences. These regions explain recurrent Robertsonian translocations, confirming long-standing cytogenetic hypotheses.

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Area of Science:

  • Genomics
  • Human Genetics
  • Molecular Biology

Background:

  • Short arms of human acrocentric chromosomes (SAACs) exhibit homology, including ribosomal DNA and segmental duplications.
  • Previous genome assemblies offered limited insight into whether homology patterns were ancestral or maintained by recombination.

Purpose of the Study:

  • To investigate the nature of homology in SAACs and its role in chromosomal rearrangements.
  • To determine if recombination occurs between non-homologous acrocentric chromosome sequences.

Main Methods:

  • Utilized an all-to-all comparison of the Human Pangenome Reference Consortium (HPRC) dataset.
  • Constructed a variation graph from centromere-spanning acrocentric contigs.
  • Analyzed linkage disequilibrium decay in pseudo-homologous regions (PHRs).

Main Results:

  • Identified PHRs within acrocentric chromosomes, suggesting recombination between non-homologous sequences.
  • Observed nearly identical contigs between heterologous acrocentric chromosomes in T2T-CHM13 assembly.
  • Found faster decay of linkage disequilibrium in PHRs, indicating higher recombination rates, except on chromosome 15.

Conclusions:

  • PHRs provide sequence and population-based evidence for recurrent Robertsonian translocations.
  • The arrangement of PHRs supports crossover within inverted duplications, explaining translocation breakpoints.
  • Findings confirm hypotheses on the basis of Robertsonian translocations developed from cytogenetic studies.