CENTROMERE BEHAVIOR DURING INTERPHASE AND MEIOTIC PROPHASE IN ALLIUM-FISTULOSUM FROM 3-D, EM RECONSTRUCTION
CENTROMERE BEHAVIOR DURING INTERPHASE AND MEIOTIC PROPHASE IN ALLIUM-FISTULOSUM FROM 3-D, EM RECONSTRUCTION
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DOI：
10.1007/bf00293189
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发表时间：
1976-01-01
期刊：
影响因子：
1.6
通讯作者：
MOENS, PB
中科院分区：
文献类型：
--
作者：
CHURCH, K;MOENS, PB
减数分裂间期前的着丝粒聚集在细胞核的一个小区域内，与核膜相关的异染色质团相对。着丝粒可以单独出现，也可以联合形成由2个或更多个着丝粒组成的结构。许多着丝粒联合是非同源的。间期着丝粒不附着在核膜上。在偶线期和粗线期，着丝粒不再聚集在核的一极，而是分布在整个核中。减数分裂前的联合似乎在减数分裂配对之前解决。只有同源着丝粒协会发生在偶线期和粗线期。没有迹象表明减数分裂前着丝粒联合参与同源染色体的前偶线排列。
Centromeres at premeiotic interphase are clustered and situated in a small area of the nucleus opposite to the nuclear envelope associated heterochromatic masses. The centromeres may occur singly or they may associate to form a structure composed of 2 or more centromeres. Many centromere associations are nonhomologous. Interphase centromeres are not attached to the nuclear envelope. At zygotene and pachytene, centromeres are no longer clustered at one pole of the nucleus but rather are distributed throughout the nucleus. Premeiotic associations appear to be resolved prior to meiotic pairing. Only homologous centromere associations occur during zygotene and pachytene. There is no indication that premeiotic centromere associations are involved in prezygotene alignment of homologous chromosomes.