TAILIEUCHUNG - Báo cáo khoa học: Dynamics in the transmission of genetic information: from meiosis to postmeiotic events

The second minireview describes the importance of meiotic recombination in meiosis, and the current understanding of this process and its control mecha-nisms. Imperfections in meiotic recombination have been linked withde novo germline mutations, abnor-mal gametes, and infertility. | MINIREVIEW SERIES Dynamics in the transmission of genetic information from meiosis to postmeiotic events Wataru Kagawa and Hitoshi Kurumizaka Graduate Schoolof Advanced Science and Engineering Waseda University Tokyo Japan Meiosis is a special type of cell division that generates haploid gametes from diploid parental cells in sexually reproducing organisms. Meiosis is essential for the maintenance of a stable chromosome count through successive generations. Failure would result in zygotes with an abnormal number of chromosomes which is usually lethal to the cell. During meiosis homologous chromosomes are paired together and meiotic recombination plays a critical role in this process. Physical connection between homologous chromosomes is essential for their accurate segregation and the ability of the cell to pair homologous chromosomes during meiosis is remarkable. Multiple DNA double-strand breaks are introduced across the entire genome the DNA strands with these breaks are then digested by exonucleases to expose single-stranded regions. The duplex region homologous to the exposed single-stranded DNA is then searched for across the genome this is complicated by the fact that interhomolog recombination is preferred over recombination between sister chromatids. Many of the mechanisms that underlie the faithful segregation of chromosomes during meiosis and the process of packaging and propagating the genomic DNA to the offspring during the postmeiotic events are still poorly understood. Our minireview series starts with the topic of the recognition of homologous chromosomes. Although meiotic recombination is critical for the accurate pairing of homologous chromosomes this process also involves the global alignment of homologous chromosomes. The possible existence of chromosome-specific identifiers that can recognize homology without directly comparing DNA sequences is discussed. The second minireview describes the importance of meiotic recombination in meiosis and the

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