The transformation of the synaptonemal complex into the “elimination chromatin” in Bombyx mori oocytes
The transformation of the synaptonemal complex into the “elimination chromatin” in Bombyx mori oocytes
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DOI：
10.1007/bf00329771
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发表时间：
1977-04
期刊：
影响因子：
1.6
通讯作者：
S. W. Rasmussen
中科院分区：
文献类型：
--
作者：
S. W. Rasmussen
从粗线期到中期Ⅰ，联会复合体以修饰的形式保留在单核细胞中。在粗线期结束时，复合体的横向成分的长度和宽度增加，之后复合体在减数分裂前期的后期阶段变得致密。最终，在中期I，单个二价体的修饰的联会复合体融合，在同源染色体之间形成或多或少连续的片层。该片层对应于历史上称为“消除染色质”的结构。它的结论是，在没有交叉和交叉形成inaprixmorifemales的联会复合体的保留和随后的修改已演变为一种替代机制，以确保定期分离的二价体。
InBombyx morioocytes the synaptonemal complexes are retained in modified form from pachytene to metaphase I. At the end of pachytene the length and width of the lateral components of the complex increase, whereafter the complexes become compacted during later stages of the meiotic prophase. Ultimately, at metaphase I the modified synaptonemal complexes of individual bivalents fuse to form a more or less continuous sheet between the homologous chromosomes. This sheet corresponds to the structure historically known as the “elimination chromatin”. It is concluded that in the absence of crossing over and chiasma formation inBombyx morifemales the retainment and subsequent modification of the synaptonemal complex has evolved as a substitute mechanism to ensure regular disjunction of the bivalents.