Meiotic chromosome axis remodelling is critical for meiotic recombination in Brassica rapa.
Meiotic chromosome axis remodelling is critical for meiotic recombination in Brassica rapa.
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DOI:
10.1093/jxb/erab035
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发表时间:
2021-04-02
影响因子:
6.9
通讯作者:
Heckmann S
中科院分区:
文献类型:
--
作者:
Cuacos M;Lambing C;Pachon-Penalba M;Osman K;Armstrong SJ;Henderson IR;Sanchez-Moran E;Franklin FCH;Heckmann S
Meiosis generates genetic variation through homologous recombination (HR) that is harnessed during breeding. HR occurs in the context of meiotic chromosome axes and the synaptonemal complex. To study the role of axis remodelling in crossover (CO) formation in a crop species, we characterized mutants of the axis-associated protein ASY1 and the axis-remodelling protein PCH2 in Brassica rapa. asy1 plants form meiotic chromosome axes that fail to synapse. CO formation is almost abolished, and residual chiasmata are proportionally enriched in terminal chromosome regions, particularly in the nucleolar organizing region (NOR)-carrying chromosome arm. pch2 plants show impaired ASY1 loading and remodelling, consequently achieving only partial synapsis, which leads to reduced CO formation and loss of the obligatory CO. PCH2-independent chiasmata are proportionally enriched towards distal chromosome regions. Similarly, in Arabidopsis pch2, COs are increased towards telomeric regions at the expense of (peri-) centromeric COs compared with the wild type. Taken together, in B. rapa, axis formation and remodelling are critical for meiotic fidelity including synapsis and CO formation, and in asy1 and pch2 CO distributions are altered. While asy1 plants are sterile, pch2 plants are semi-sterile and thus PCH2 could be an interesting target for breeding programmes. ASY1 and PCH2 are critical for meiotic axis remodelling as well as synaptonemal complex and crossover formation in Brassica rapa. Residual crossovers in asy1 and pch2 plants show altered patterning.
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影响因子:
4.5
作者:
Berchowitz, Luke E.;Francis, Kirk E.;Bey, Alexandra L.;Copenhaver, Gregory P.
通讯作者:
Copenhaver, Gregory P.
影响因子:
5.6
作者:
Blary A;Gonzalo A;Eber F;Bérard A;Bergès H;Bessoltane N;Charif D;Charpentier C;Cromer L;Fourment J;Genevriez C;Le Paslier MC;Lodé M;Lucas MO;Nesi N;Lloyd A;Chèvre AM;Jenczewski E
通讯作者:
Jenczewski E
影响因子:
7.2
作者:
Demirci, Sevgin;van Dijk, Aalt D. J.;Peters, Sander A.
通讯作者:
Peters, Sander A.
影响因子:
56.9
作者:
Alonso, JM;Stepanova, AN;Ecker, JR
通讯作者:
Ecker, JR
DOI:
10.1007/978-1-60761-103-5_9
发表时间:
2009-01-01
期刊:
MEIOSIS, VOL 2: CYTOLOGICAL METHODS
影响因子:
--
作者:
Armstrong, Susan J.;Sanchez-Moran, Eugenio;Franklin, F. Chris H.
通讯作者:
Franklin, F. Chris H.