Spindle asymmetry drives non-Mendelian chromosome segregation.

Spindle asymmetry drives non-Mendelian chromosome segregation.
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DOI:
10.1126/science.aan0092
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发表时间:
2017-11-03
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Lampson MA
Lampson MA
中科院分区:
其他
文献类型:
--
作者:
Akera T;Chmátal L;Trimm E;Yang K;Aonbangkhen C;Chenoweth DM;Janke C;Schultz RM;Lampson MA

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Genetic elements compete for transmission through meiosis, when haploid gametes are created from a diploid parent. Selfish elements can enhance their transmission through a process known as meiotic drive. In female meiosis, selfish elements drive by preferentially attaching to the egg side of the spindle. This implies some asymmetry between the two sides of the spindle, but molecular mechanisms underlying spindle asymmetry are unknown. Here we found that CDC42 signaling from the cell cortex regulated microtubule tyrosination to induce spindle asymmetry. Non-Mendelian segregation depended on this asymmetry. Cortical CDC42 depends on polarization directed by chromosomes, which are positioned near the cortex to allow the asymmetric cell division. Thus, selfish meiotic drivers exploit the asymmetry inherent in female meiosis to bias their transmission.
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发表时间: 2011-12-22
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