MadSci Network: Cell Biology
Query:

Re: Water destroys Sperm does it also destroy DNA

Date: Sun May 13 21:19:23 2001
Posted By: Rob Welton, Biochemist / Asst. Technical Director
Area of science: Cell Biology
ID: 989130093.Cb
Message:

You are correct water does destroy the sperm cell, most likely due to the
differences in osmotic pressure.  With regards to the DNA, water does not
necessarily destroy the DNA.  DNA molecules are quite stable in water or
aqueous solutions.  However, the molecules if left in water for extended
periods of time can begin to degrade.  To answer you question about what
can destroy DNA, there are a number of things, from enzymes which cut and
degrade the molecule to a variety of chemicals and radiation that can cause
damage to and ultimately destroy the molecule.   A more specific example of
DNA destruction can be seen in the bacterial world.  Many species of
bacteria contain enzymes called endonucleases that they use to destroy
foreign DNA that they encounter.  These enzymes recognize specific DNA
sequences called restriction sites.  Once they recognize the site the
enzyme cleaves the DNA at this site.

Hope this helps.
RMW



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