The normal tissue tolerance levels to fractionated radiotherapy have been appreciated by a century of careful clinical observations and radiobiological studies in animals. During clinical fractionated radiotherapy, these normal tissue tolerance levels are respected, and severe sequelae of radiothera
γH2AX marks the main events of the spermatogenic process
✍ Scribed by Josefa Blanco-Rodríguez
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 562 KB
- Volume
- 72
- Category
- Article
- ISSN
- 1059-910X
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Recent findings reveal that chromatin reorganization requires formation and repair of DNA double strand breaks (DSBs). Therefore, dynamic changes in chromatin structure taking place along the mitotic and the meiotic processes should be accompanied by histone H2AX phosphorylation and formation of γH2AX, a prominent event occurring at DSB sites. Accordingly, γH2AX has been detected at multiple developmental steps in adult germ cells. Nevertheless, no comprehensive study focusing on the main biological events occurring in the seminiferous epithelium has been carried out in mammals. Here I analyze H2AX phosphorylation in immunostained testis sections comparing PAS/cresyl violet counterstained, noncounterstained, and immuno‐fluorescence preparations and show several waves of H2AX phosphorylation/dephosphorylation coupled to various developmental phases of spermatogonia and spermatocytes as well as to spermatid differentiation. The combined detection of DNA replication or free 3′‐OH DNA ends highlight the possible significance of γH2AX at these locations. Microsc. Res. Tech., 2009. © 2009 Wiley‐Liss, Inc.
📜 SIMILAR VOLUMES
## Abstract Mammalian acrosome reaction (AR) requires successive activation of three different types of calcium channels (T‐type channels, Inositol‐3‐phosphate (InsP3) receptors, and TRPC2 channels). All the calcium signaling is under the control of the activation of the first‐one, a T‐type calcium
The effects of the initial feed composition, temperature and pressure on the equilibrium conversions and concentrations of the components were examined for methanol synthesis from CO, and H,. The two-reaction system CO, + 3H, & CH,OH + H,O, CO, + H, F? CO + H,O was analyzed. From a thermodynamic vie