In Escherichia coli, at least two groups of proteins, or "recombination machines," can operate independently on broken DNA to produce a 3'-terminated single-stranded DNA filament coated with RecA protein and ready for synapsis with intact homologous DNA. Recent analyses of mutants lacking one or more of the activities required for presynaptic filament formation by one recombination machine demo...

Background: During the first meiotic prophase, alignment and synapsis of the homologous chromosomes are mediated by the synaptonemal complex. Incorrect assembly of the synaptonemal complex leads to impaired recombination and cell death, which in humans, causes infertility in males. Testis-expressed gene 12 (TEX12) is a germ cell-specific gene that is located on the chromosome 11 (11q22) in huma...

Material and methods. ................................. A brief resume of meiotic behavior in diploid individuals. Meiosis in the triploid individual. ....................... Plaamodial sporogenous tissue. .......................... Chromatin extrusion in sporogenous tissue ................ TheF~generation ..................................... Meiosis in Fr individuals. ...........................

Susceptibility of the reproductive system to temperature fluctuations is a recurrent problem for crop production under changing climate. The damage complex as multiple processes in male and female gamete formation are affected, but general, particularly pollen impaired. Here, impact short periods elevated on meiosis tomato ( Solanum lycopersicon L.) reported. Meiocytes early stage flower buds e...

ABSTRACT Heterochromatin-related epigenetic mechanisms, such as DNA methylation, facilitate pairing of homologous chromosomes during the meiotic prophase mammalian spermatogenesis. In pro-spermatogonia, de novo methylation plays a key role in completing and initiating division. However, maintenance regulation meiosis, especially adult, is not well understood. Here, we reveal that NP95 (also kno...

The synaptonemal complex (SC) and the centromeres have long been thought to play their roles at quite different, nonoverlapping periods during meiosis. The SC is viewed as a hallmark structure that connects homologous chromosomes and is functionally critical for early prophase (zygotene and pachytene), while centromeres are known to assemble the kinetochore, act as a target for microtubules, an...

The transposon Tn3 encodes a protein known as resolvase. During transposition, resolvase catalyses a site-specific recombination between two directly repeated copies of the transposon DNA [I]. Resolvase acts by binding to 120 bp sites on the DNA, known as res sites, each of which contains three sub-sites called I, I1 and 111 [2]. During recombination, three resolvase dimers bind co-operatively ...