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1 results

  • Chapter 6 - Sperm Chromatin Packaging and the Toroid Linker Model

  • from Section 2 - The Biology of Male Reproduction and Infertility
  • Edited by Douglas T. Carrell, Utah Center for Reproductive Medicine, Alexander W. Pastuszak, University of Utah, James M. Hotaling, Utah Center for Reproductive Medicine
  • Book:
    Men's Reproductive and Sexual Health Throughout the Lifespan
    Published online:
    06 December 2023
    Print publication:
    16 November 2023, pp 54-60

  • Summary

    We have previously reported in several publications the existence of a nuclease that is present in the luminal fluid of the epididymis and in higher concentrations in the lumina fluid of the vas deferens in the mouse. This luminal nuclease has the ability to digest the sperm DNA into loop-sized fragments but is restricted to digesting DNA that is not bound by protamines. In this chapter, we describe new data that show that the luminal nuclease is active in SDS for up to 30 min, complicating the analysis of sperm DNA damage that must be extracted by SDS for electrophoretic analysis on gels. High concentrations of EDTA can protect the DNA from the luminal nuclease if added before SDS is applied. This new data provides an update on our toroid loop model for sperm chromatin structure. We discuss the implications of this updated model for the study of sperm chromatin structure and for clinical assays for sperm DNA damage.