pachytene


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pachytene

[′pak·ə‚tēn]
(cell and molecular biology)
The third stage of meiotic prophase during which paired chromosomes thicken, each chromosome splits into chromatids, and breakage and crossing over between nonsister chromatids occur. Also known as pachynema.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Two generations of round spermatids as well as zygotene and pachytene stages of primary spermatocytes were also observed in this stage.
D) Impairment of meiosis (Impairment of meiosis of male germ cells, arrest in pachytene of male germ cells);
In oocytes and spermatocytes, the analysis of pachytene nuclei revealed 29 chromosome pairs in both sexes (Fig.
In control animals GLD-1::GFP has a tightly restricted expression pattern that begins prior to the entry into meiosis, reaches maximal levels during the pachytene stage (meiotic prophase), and extends to the loop region (diplotene/diakinesis).
The spg are located on the basal membrane; above these, many spcI in different stages of the meiotic prophase from preleptotene, pachytene, diplotene until diakinesis are easily recognizable according to the aspect of thechromatin.
Germ cells, including spermatogonia, spermatocytes, pachytene spermatocytes, and round spermatids, were recovered from testes of mice exposed to B[a]P, while mature spermatozoa were isolated from vas deferens.
Pachytene asynapsis drives meiotic sex chromosome inactivation and leads to substantial postmeiotic repression in spermatids.
Aneuploidies generated after a 24-hr test interval arise from the impairment of late meiotic (late pachytene and onward) and early embryonic processes, whereas the 65-hr interval captures aneuploidies originating from the disruption of any mitotic and meiotic events in the germline in addition to early embryonic stages.
miR-34c has been identified to be produced specifically in germ cells and is produced mainly in the late stages of meiosis (pachytene spermatocytes and round spermatids) (29, 30).
(46) FSH is responsible for the development and differentiation of spermatogonia through different stages namely spermatogonia, preleptotene, leptotene, early pachytene, late pachytene, and secondary spermatocytes after the attainment of puberty.