pachytene


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pachytene

 [pak´e-tēn]
in prophase of meiosis, the stage following zygotene, during which the chromosomes shorten, thicken, and separate into two sister chromatids joined at their centromeres. Paired homologous chromosomes, which were joined by synapsis, now form a tetrad of four chromatids. Where crossing over has occurred between nonsister chromatids, they are joined by X-shaped chiasmata.

pach·y·tene

(pak'i-tēn),
The stage of prophase in meiosis in which pairing of homologous chromosomes is complete and the paired homologues may twine about each other as they continue to shorten; longitudinal cleavage occurs in each chromosome to form two sister chromatids so that each homologous chromosome pair becomes a set of four intertwined chromatids.
Synonym(s): pachynema
[pachy- + G. tainia, band, tape]

pachytene

(păk′ĭ-tēn′)
n.
The third stage of the prophase of meiosis, during which the homologous chromosomes become short and thick and divide into four distinct chromatids.

pach·y·tene

(pak'i-tēn)
The stage of prophase in meiosis in which pairing of homologous chromosomes is complete; longitudinal cleavage occurs in each chromosome to form two sister chromatids so that each homologous chromosome pair becomes a set of four intertwined chromatids.
[pachy- + G. tainia, band, tape]

pachytene

the stage in prophase 1 of MEIOSIS where the paired HOMOLOGOUS CHROMOSOMES each split into two CHROMATIDS, the whole structure being called a TETRAD.
References in periodicals archive ?
The large nuclei of spermatocytes in the pachytene stage were located in the middle of the seminiferous epithelium, while the nuclei of Sertoli cells, type A spermatogonia, and intermediate spermatogonium were closer to the basal lamina of the seminiferous tubule.
In control cultures, the percentages listed in Table S3 (http:// dx.doi.org/10.14573/altex.1601253s3) of the four stages of the meiotic prophase (leptotene, zygotene, pachytene and diplotene) are of the same order of magnitude as those obtained previously (Ali et al., 2014; Geoffroy-Siraudin et al., 2010, 2012).
The pachytene karyotype of the pink bollworm (Lepidoptera: Gelechiidae).
Of animals with increased GLD-1::GFP levels, the maximum fluorescent intensity in the pachytene region was found to be transiently higher in treated animals relative to controls (131.0 [+ or -] 8.9--versus--109.2 [+ or -] 6.4, n = 5) between 4 and 6 hours of treatment.
The few spcI in pachytene stage, detectable in this area, were positive for the three receptors.
Sedimentation at Unit Gravity was used to separate each type of germ cell, including spermatogonia, pachytene spermatocytes, round spermatids, and elongated spermatids.
To this end, we first monitored the activation of the late pachytene meiotic checkpoint that leads to apoptotic clearing of nuclei carrying unrepaired DNA damage (Gartner et al.
This latter cell gives rise to the primary spermatocyte, which quickly undergoes its first meiotic division and passes through 4 prophase stages, leptotene, zygotene, pachytene, and diplotene, before undergoing meiotic metaphase.
Subsequent to pachytene of meiosis the bivalents form a typical diplotene configuration.
In 69.5% of 3,550 meiocytes analysed, the B chromosomes show themselves detached from the chromatin especially during the pachytene (431 cells), in early ascension in the metaphase I (938 cells), or delayed in the anaphase I (1098 cells) (Figures 1A and B).
2-4), more intensive staining revealed overcondensation of the X chromosome from leptotene to pachytene (Fig.