Behaviour of microchromosome-associated satellite DNA in the banded krait,Bungarus fasciatus (Ophidia,Elapidae) |
| |
Authors: | Lalji Singh Kshitish C Majumdar |
| |
Institution: | 1. Centre for Cellular and Molecular Biology, 500 007, Hyderabad, India
|
| |
Abstract: | Banded krait(Bungarus fasciatus) major satellite DNA (p = 1.700 g/cm3) is mainly localized in the C-band-positive regions of all the microchromosomes. Our study of the behaviour of this satellite
DNA byin situ hybridization has revealed a striking polarization of this DNA in the follicular epithelial cells of the ovary during oogenesis
and in the spermatids during spermiogenesis. The major satellite DNA is localized at the point of the subsequent protrusion
of the acrosomal pole of the round spermatid nuclei and remains in close contact with the developing sperm tip during the
process of spermiogenesis. There appears to be an attraction between a specific region of the nuclear membrane and satellite-rich
chromatin of the microchromosomes that brings about their polarization. We discuss possible functions of such extreme polarization
of microchromosomes in specific cell types during oogenesis and spermiogenesis. |
| |
Keywords: | Satellite DNA microchromosomes oogenesis spermiogenesis acrosomal pole |
本文献已被 SpringerLink 等数据库收录! |