Results 61 to 70 of about 7,796 (196)

Sperm Mitochondrial DNA Copy Number and Nuclear DNA Methylation Across Clinical and Non‐Clinical Preconception Cohorts

Andrology, EarlyView.
ABSTRACT Background Sperm mitochondrial DNA copy number is an emerging marker of male fertility, with elevated mtDNAcn associated with poor semen quality across various populations. Sperm DNA methylation has also been previously demonstrated to be negatively correlated with semen parameters in IVF cohorts.
Savni Sawant, Karolina Nowak, Amanda L. Paskavitz, Emily Houle, Ricardo P. Bertolla, Lidia Minguez‐Alarcon, Russ Hauser, J. Richard Pilsner   +7 more
wiley   +1 more source

Occupational Physical Activity Is Negatively Associated With Semen Quality

Andrology, EarlyView.
ABSTRACT Background Lifestyle factors have been associated with semen quality and have been implicated in the reported global decline in semen parameters. Moderate physical activity has been linked to improved semen quality; however, the association between occupational physical activity and semen quality is limited.
Michal Efrat, Sharon Barak, Anat Stein, Haim Pinkas, Ron Unger, Ruth Birk   +5 more
wiley   +1 more source

SPERMIOGENESIS IN CANCER CRABS [PDF]

The Journal of Cell Biology, 1969
Spermiogenesis in Cancer crabs was studied by light and electron microscopy. The sperm are aflagellate, and when mature consist primarily of a spherical acrosome surrounded by the nucleus with its short radiating arms. The acrosome forms by a coalescence of periodic acid-Schiff-positive (PAS-positive) vesicles.
openaire   +2 more sources

Spatiotemporal Expression of ARRDC5 in Mammalian Spermatogenesis

Andrology, EarlyView.
ABSTRACT Background Spermiogenesis is the final phase of sperm development during which haploid round spermatids transform into specialized spermatozoa and occurs across distinct stages of sperm production in the seminiferous epithelium. Abnormalities in this process lead to malformations and an inability of sperm to fertilize eggs.
LeeLa D. Robinson, Jon M. Oatley
wiley   +1 more source

Male Mice Heterozygous for Protamine 1 and Protamine 2 Are Infertile, Displaying Sperm Damage and Retention of Protamine 2 Precursors, Transition Proteins, and Histones

Andrology, EarlyView.
ABSTRACT Background During spermiogenesis, protamines (PRMs) replace histones to hypercondense and protect sperm DNA. Rodents and primates express two PRMs (PRM1 and PRM2). Alterations of species‐specific PRM ratios are associated with sub‐ or infertility in mice and humans.
Gina Esther Merges, Christoph Wiesejahn, Mar Domingo‐Lopez, Simon Schneider, Andjela Kovacevic, Lena Arévalo, Hubert Schorle   +6 more
wiley   +1 more source

Spermiogenesis and sperm ultrastructure in Calicotyle affinis Scott, 1911 (Platyhelminthes, Monogenea, Monopisthocotylea, Monocotylidae)

Helminthologia, 2017
Spermatological characteristics of Calicotyle affinis Scott, 1911, an endoparasitic monocotylid monogenean from the cloaca of a holocephalan fish Chimaera monstrosa L, have been investigated by means of transmission electron microscopy for the first time.
Bruňanská M., Poddubnaya L. G.
doaj   +1 more source

Fine structure of the gonadal tissue of the horned octopod Eledone cirrhosa (Lamarck, 1798) (Mollusca – Octopoda) during sexual maturity [PDF]

Brazilian Journal of Biology
The horned octopod Eledone cirrhosa, a medium-sized species found in Arabian Gulf off Saudi Arabia, was collected monthly from the Arabian Gulf off Dammam city during January to December 2022.
N. AlQurashi, G. Ibrahim
doaj   +1 more source

Anatomical and Histological Structures of the Male Reproductive System of Chalcophora mariana (Linnaeus, 1758) (Coleoptera: Buprestidae): Light and Scanning Electron Microscopy Study

Acta Zoologica, EarlyView.
ABSTRACT This study presents the first detailed morphological analysis of the male reproductive system of Chalcophora mariana (Linnaeus, 1758) using stereo microscopy, light microscopy, and scanning electron microscopy. The male reproductive system of C.
Hicret Arslan, Selami Candan
wiley   +1 more source

Anatomical and Histological Descriptions of the Male Reproductive System of the Alfalfa Weevil of Hypera postica (Gyllenhal, 1813) (Coleoptera: Curculionidae) Using Light and Scanning Electron Microscopies

Acta Zoologica, EarlyView.
ABSTRACT Features of the reproductive organs, such as the number of testicular follicles, testis colour and the morphology of the glands, can be used as systematic characters. For this purpose, this paper was the first description of the male reproductive system anatomy and histology of Hypera postica (Gyllenhal, 1813) (Coleoptera: Curculionidae), a ...
Nurcan Özyurt Koçakoğlu, Selami Candan, Hicret Arslan, Mustafa Güllü   +3 more
wiley   +1 more source

Biallelic Truncating Variant in LRGUK Is Associated With Severe Multiple Morphological Abnormalities of the Sperm Flagella and Sperm Nuclear Defects in Humans

Clinical Genetics, EarlyView.
A homozygous truncating variant in LRGUK results in loss of the LRGUK protein and causes multiple morphological abnormalities of the flagella (MMAF), disrupted axonemal architecture, central pair defects, abnormal chromatin organization, and severe male infertility, establishing LRGUK as a novel human infertility gene.
Wiâme Mokkedem, Zeina Wehbe, Anne‐Laure Barbotin, Angèle Boursier, Célia Tebbakh, Nicolas Thierry‐Mieg, Marie Bidart, Antonella Migliaccio, Rosanna Chianese, Christophe Arnoult, Raoudha Zouari, Zine‐Eddine Kherraf, Pierre F. Ray, Guillaume Martinez, Charles Coutton   +14 more
wiley   +1 more source