File:Synapsis and centromere pairing in mouse spermatocytes-ru.tif

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English: Homologous chromosomes are not paired in leptotene, but SYCP3 starts to localize to centromeres and arms. In zygotene, synapsis initiates from the non-centromeric regions and progresses as SYCP1 and central element proteins zip up SYCP3-containing chromosome axes. At late zygotene, centromeres are at last paired and synapsed, and full SC is formed along the entire chromosome in pachytene. In diplotene, the SC disassembles except at the sites where centromere pairing persists and chiasmata are formed. At diakinesis/metaphase I, SYCP3 proteins are accumulated on the centromere and a small fraction of homologous centromeres are linked by SYCP3-containing stretches, which may function in bi-orientation of homologous centromeres and attachment to the spindles for the first meiotic division.
Русский: Во время лептотены гомологичные хромосомы находятся в неспаренном состоянии , однако на них уже выявляется белок синаптонемного комплекса SYCP3. Синапсис начинается с внецентромерных участков во время зиготены и "спаривает" SYCP3-содержащие хромосомный остов при помощи белков центрального элемента и SYCP1. Спаривание центромерных участков происходит последней в конце поздней зиготены, полностью синаптонемный комплекс формируется во время пахитены. Во время диплотены синаптонемный комплекс разбирается за исключением центромер и хиазм. Во время диакинеза и метафазы 1 белок SYCP накапливается в районе центромер.
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Source Takeo S, Hawley RS (2012) Rumors of Its Disassembly Have Been Greatly Exaggerated: The Secret Life of the Synaptonemal Complex at the Centromeres. PLoS Genet 8(6): e1002807. doi:10.1371/journal.pgen.1002807
Author Takeo S, Hawley RS
This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: translated. The original can be viewed here: Synapsis and centromere pairing in mouse spermatocytes.tif: . Modifications made by Abogomazova.

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