Loidl J, Nairz K, Klein F
Department of Cytology and Genetics, Institute of Botany, University of Vienna, Austria.
Chromosoma. 1991 May;100(4):221-8. doi: 10.1007/BF00344155.
An extensive synaptonemal complex (SC) is found at pachytene in whole mount spread preparations of a haploid yeast, Saccharomyces cerevisiae, strain. Whereas unsynapsed axial elements are present only in a few nuclei, in others non-homologous synapsis involves virtually the whole chromosome set. This suggests that homology is not an indispensable precondition for SC formation in yeast but that chromosomes engage in non-homologous synapsis if no homologous partner is available. Recent evidence that in the sporulation deficient yeast mutants rad50 and mer1 axial elements do form but remain unsynapsed in the majority of nuclei is discussed in the light of the above findings.
在单倍体酿酒酵母菌株的整装铺片制备物中，粗线期可发现广泛的联会复合体（SC）。未联会的轴元件仅存在于少数细胞核中，而在其他细胞核中，非同源联会几乎涉及整个染色体组。这表明同源性并非酵母中SC形成不可或缺的先决条件，而是在没有同源配对体时，染色体可进行非同源联会。根据上述发现，讨论了最近的证据，即在孢子形成缺陷的酵母突变体rad50和mer1中，轴元件确实形成，但在大多数细胞核中仍未联会。
