scholarly journals CENH3 morphogenesis reveals dynamic centromere associations during synaptonemal complex formation and the progression through male meiosis in hexaploid wheat

2017 ◽  
Vol 89 (2) ◽  
pp. 235-249 ◽  
Author(s):  
Adél Sepsi ◽  
James D. Higgins ◽  
John S. Pat Heslop-Harrison ◽  
Trude Schwarzacher
Keyword(s):  
Complex Formation ◽  
Synaptonemal Complex ◽  
Hexaploid Wheat ◽  
Male Meiosis ◽  
Synaptonemal Complex Formation

Synaptonemal complex formation in male scorpions exhibiting achiasmate meiosis and structural heterozygosity

Genome ◽  
1990 ◽  
Vol 33 (6) ◽  
pp. 914-926 ◽  
Author(s):  
Catherine M. Shanahan ◽  
David L. Hayman
Keyword(s):  
Complex Formation ◽  
Synaptonemal Complex ◽  
Meiotic Chromosome ◽  
Male Meiosis ◽  
Late Prophase ◽  
Maintenance System ◽  
Structural Heterozygosity ◽  
Synaptonemal Complex Formation ◽  
And Inversion ◽  
Metaphase I

Synaptonemal complex (SC) formation was studied in testicular material from individuals of a number of species from two families of Australian scorpions; Buthidae and Scorpionidae. These scorpions exhibit unusual cytogenetic features including achiasmate male meiosis, interchange heterozygosity, and centromeric fusion–fission and inversion heterozygosity. The synaptic behaviour of chromosomes involved in these rearrangements was studied from zygotene to metaphase I, using both meiotic chromosome preparations and techniques for examination of the SCs. Multivalent associations present during the achiasmate meiosis of both buthid and scorpionid scorpions are retained from prophase to metaphase I, unlike those present in polyploid achiasmate Bombyx females. Further evidence suggests that synaptic adjustment does not occur generally in achiasmate scorpionid inversion heterozygotes. However, for some inversions, pairing is seen to become more heterosynaptic from late prophase to metaphase I and this may be related to the pairing maintenance system during achiasmate meiosis in these specialized organisms.Key words: synaptonemal complex, achiasmate meiosis, heterozygosity, interchange, inversion.

scholarly journals Hormad1 Is a Germ Cell-Specific HORMA Containing Protein Required for Synaptonemal Complex Formation in Male Meiosis.

2009 ◽  
Vol 81 (Suppl_1) ◽  
pp. 172-172
Author(s):  
Yonghyun Shin ◽  
Malgorzata Kloc ◽  
Youngsok Choi ◽  
Marvin L. Meistrich ◽  
Aleksandar Rajkovic
Keyword(s):  
Complex Formation ◽  
Germ Cell ◽  
Synaptonemal Complex ◽  
Male Meiosis ◽  
Synaptonemal Complex Formation

scholarly journals Chromosome-autonomous feedback down-regulates meiotic DNA break competence upon synaptonemal complex formation

2020 ◽  
Vol 34 (23-24) ◽  
pp. 1605-1618 ◽  
Author(s):  
Xiaojing Mu ◽  
Hajime Murakami ◽  
Neeman Mohibullah ◽  
Scott Keeney
Keyword(s):  
Complex Formation ◽  
Synaptonemal Complex ◽  
Synaptonemal Complex Formation ◽  
Dna Break

Chromatin structure contribution to the synaptonemal complex formation

2008 ◽  
Vol 66 (7) ◽  
pp. 1198-1208 ◽  
Author(s):  
A. Hernández-Hernández ◽  
G. H. Vázquez-Nin ◽  
O. M. Echeverría ◽  
F. Recillas-Targa
Keyword(s):  
Complex Formation ◽  
Synaptonemal Complex ◽  
Chromatin Structure ◽  
Synaptonemal Complex Formation

scholarly journals SYNAPTONEMAL COMPLEXES DURING PREMEIOTIC DNA SYNTHESIS IN OOCYTES OF DROSOPHILA MELANOGASTER

Genetics ◽  
1976 ◽  
Vol 83 (1) ◽  
pp. 67-79
Author(s):  
John W Day ◽  
Rhoda F Grell
Keyword(s):  
Complex Formation ◽  
Dna Synthesis ◽  
Synaptonemal Complex ◽  
Direct Evidence ◽  
Indirect Evidence ◽  
Female Development ◽  
Electron Microscope Autoradiography ◽  
Fourfold Increase ◽  
Microscope Autoradiography ◽  
Synaptonemal Complex Formation

ABSTRACT Well-synchronized populations of oocytes obtained by means of the "pupal system" (Grell, 1973a) have been examined to determine the time of appearance of the synaptonemal complex. The complex first appears in the most advanced oocytes between 132 and 138 hr of female development. Between 138 and 156 hr the complex apparently undergoes a fourfold increase in length. At 150 and 156 hr the complex system is extensive and present in virtually all oocytes. Previous studies using the pupal system have placed the period of premeiotic DNA synthesis between 132 and 162 hr. Thus, indirect evidence indicates that a significant portion of synaptonemal complex formation is coextensive with the main DNA replication in the oocyte. Direct evidence that DNA synthesis and complex formation occur simultaneously in oocytes has been obtained by electron microscope autoradiography. By definition, then, the stage of synaptonemal complex formation in Drosophila must include premeiotic interphase.

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