In fetal human ovary cultures, the highly proliferative premeiotic
oogonia ([TFAP2C.sup.+]) were reduced in number following analgesic exposure, similar to findings in the fetal testis.
In a broad context, the premeiotic
phase (stages I, II, and III), the meiotic phase (stage IV), and the postmeiotic phase (stages V, VI, VII, and VIII) account for 47.75%, 6.87%, and 45.37% of the seminiferous epithelium cycle, respectively.
For identification of the inflorescence development-related genes, these libraries were classified into five types according to the tissues used in library preparation, including seedling-stage leaf and stem, seedling to tillering-stage root, seed (from DPA3 to mature), and inflorescence (including premeiotic
anthers, anthers at meiosis, pistil and ovary, immature inflorescence, lemma and palea, spike before flowering, and spike at flowering).
It is known that Cdc28-Clb5 (CDK-S) activity increases during premeiotic
replication and peaks before MI [156, 157] and thus may help orchestrate a concerted progression of meiotic recombination and prophase I .
Mutagenic products and mutations accumulate with advanced paternal age due to oxidative stress-induced DNA damage and more premeiotic
In particular, numerous premeiotic
and meiotic genes (Tab.
In Ephedra, the nucellus is post-meiotic (Rydin et al., 2010), whereas nucellus of Taxus is premeiotic
The transcription factors such as DDX4 were expressed in post-migratory primordial germ cells until the premeiotic
stage of germ cells.
Developmental expression of the pluripotency factor sal-like protein 4 in the monkey, human and mouse testis: restriction to premeiotic
Some low frequency of large sized PMCs (1.24%) in P-1 at early prophase was also seen with apparently double the chromatin mass and with two nucleoli (Figure 1(g)) which indicates that the 4x PMCs formation must have resulted from cell fusion or cytomixis in premeiotic
Leydig cell-derived heme oxygenase-1 regulates apoptosis of premeiotic
germ cells in response to stress.
Lack of UCHL1 decreased apoptosis rate and increased the number of premeiotic
germ cells in immature mice (13), but in adult mice spermatogenesis was damaged by spermatogonial reduction and primary spermatocytes which mainly undergo apoptosis (13).