Male
diplotene nuclei show seven autosomal bivalents with one or two terminal or interstitial chiasmata, and one sex univalent (Fig.
Stage III (c) presents zygotene spermatocytes (Z), pachytene spermatocytes (P),
diplotene spermatocytes (D), elongated spermatids (E), and Sertoli cells (S).
To summarize, the cell subtype percentages of zygotene and
diplotene for CBZ-, IPR- and CCK-treated cell cultures followed the same decreasing trend compared with controls.
Indeed, in one experiment she had to sacriice 125 females to obtain 30
diplotene cells.
Dspite its infancy to preserve fertility and lack of studies, ovarian tissue cryopreservation has several potential advantages, such as the presence of many primordial follicles with oocyte arrest in
diplotene of prophase of the first meiotic division, primordial follicles being theoretically less cryosensitive than mature oocyes, and preservation of the endocrinal function of the ovary.
The oocytes are arrested in the dictate stage, a prolonged
diplotene stage of the first meiotic division also known as the germinal vesicle stage.
SYCP2 and SYCP3 are required for cohesin core integrity at
diplotene but not for centromere cohesion at the first meiotic division.
Sertoli cell-selected AR knockout mice exhibit spermatogenesis arrest at the
diplotene stage [1-3], similar to the phenotype of AR knockout mice.
El nucleo ovocitario presenta un prominente (nucleolo y los cromosomas en configuracion
diplotene o lampbrush.(Fig.
1B) and, in
diplotene, they form 10 autosomal bivalents.
1 b) appears entirely heterochromatic (positively heteropycnotic) from early
diplotene (Fig.