Background: Current microscopic experimental methods cannot diagnose DNA damages present in spermatozoa .Therefore, some methods are needed to address the abnormality of the genetic material status on the sperm samples. As reported by many investigators aniline blue staining technique has been used for identifying sperm chromatin condensation. Also, chromomycin A3 is used for evaluation of the ...

OBJECTIVE The aim of this study was to evaluate the influence of different periods of abstinence on conventional semen parameters as well as functional parameters in human semen, including mitochondrial function, chromatin packing and sperm DNA fragmentation. METHODS We recruited a cohort of 2,458 men undergoing infertility investigation. Semen analyses were performed according to WHO guideli...

introduction: the frequency of sperm pcc indiction in normal and infertile men was investigated. material and methods: zona – free hamster oocyte were retrieved after super ovulation by pmsg and hcg infection. following treatment with hyaloronidase, zona was removed by trypsin digestion. sperms were classified with sperms, and then transferred to fresh media containing colcemid. slides were pre...

Dispersion of nuclear fibers of the spermatozoa of dogfish, man, and bull is made possible after treatment with a reducing and alkylating reagent coupled with an anionic detergent; the same detergent used at a low ionic strength dissociates the nuclear content of the rainbow trout sperm. Electron microscopy of such dispersed nuclear fibers has shown a beads-on-a-string configuration for these f...

Recent data from several laboratories have provided evidence that the newly fertilized oocyte inherits epigenetic signals from the sperm chromatin that are required for proper embryonic development. For the purposes of this review, the term epigenetic is used to describe all types of molecular information that are transmitted from the sperm cell to the embryo. There are at least six different f...

Xenopus sperm chromatin lacks class III transcription complexes and somatic histone H1. Inactive class III genes in sperm chromatin are easily programmed with transcription complexes de novo and transcribed in Xenopus oocyte nuclear extract. In contrast, repressed class III genes in somatic chromatin are not transcribed in the oocyte nuclear extract. Class III genes that are initially inactive ...

Sperm chromatin of Murex brandaris (a neogastropod mollusc) undergoes a series of structural transitions during spermiogenesis. The DNA-interacting proteins responsible for these changes as well as the mature protamines present in the ripe sperm nucleus have been characterized. The results reveal that spermiogenic nuclear proteins are protamine precursors that are subjected to a substantial num...

(Abstracted from Hum Reprod 2022;37:1106–1125) With intracytoplasmic sperm injection (ICSI), many natural barriers that would normally prevent the entry of abnormal are lost, increasing importance DNA integrity for successful in vitro fertilization. There is currently no consensus on optimal assay measuring quality (DNAq), defined as any structural aspect chromatin can compromise function if di...

Mouse spermatozoa and androgenetic one-cell embryos (androgenones) at various developmental stages were exposed to etoposide (1 μM), a topoisomerase II (topo II) poison, or to either of two catalytic inhibitors: ICRF-193 (10 μM) or merbarone (50 μM), for 2 h in order to study the clastogenic effects of these drugs on remodeled sperm chromatin. None of the drugs induced structural chromosome abe...

To evaluate whether the sperm DNA fragmentation affects male pronucleus epigenetic factors, semen analysis was performed and DNA fragmentation was assessed by the method of sperm chromatin structure assay (SCSA). Human-mouse interspecies fertilisation was used to create human male pronucleus. Male pronucleus DNA methylation and H4K12 acetylation were evaluated by immunostaining. Results showed ...