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Re: 1 in a million


You have opened a door wide.  If the mutation rate can vary between clones
and between regions of the genome, then give us a mechanism for this.  If
the genome is unstable as a whole, then I would expect all kinds of strange
mutations in Hosta.  Something like what you get in the F2 of irradiated
seed.  But what we are seeing are specific mutations related to the
chlorophyll content of specific cells.

If the higher mutation rate is confined to specific portions of the genome,
then we are proposing another mechanism to facilitate mutation (not all that
different from transposable elements).  What kind of mechanism would it be?

Jim Anderson

-----Original Message-----
From: zonneveld <zonneveld@rulbim.leidenuniv.nl>
To: hosta-open@mallorn.com <hosta-open@mallorn.com>
Date: Monday, August 16, 1999 4:28 AM
Subject: 1 in a million

If people dont mind and setting aside some unecesarely rude remarks
This is what I can see about mutations

First definitions as half the confusion is related to the fact that
people assume that a sport is  the same as a mutation( it is not)
something I have tried to convince you from  in nearly every article
in the journal
SPORT: a shoot differing from the mother plant

irrespective of the cause!)
MUTATION: a heritable change in DNA.
If a green plants mutates to a  variagated one we have a
sport due to a mutation.
Jim Anderson is right when he says that ON AVERAGE ( my
addition) mutation frequency is one in a million
But there are two caveats!
First the mutation frequency strongly depends on the clone. As an
example I induced a certain mutation in 3 different yeast strains of
the same species. one did give me 3 mutants the other 800, the
third around 10.000 per million
Secondly It strongly depends on the genes involved.
So the frequency of mutation easely varies between 1/10.000 and
1/100.000.000  depending on the clone and the genes involved
So in my opinion Hosta does not have a very high mutation rate Only
the gene(s) we are interested in and leads to variegation mutated
with a high frequency Remember however that most sports are NOT
due to mutation but to Chim rearr and mitotic recombination.

Ben J.M.Zonneveld
Clusius lab pobox 9505
2300 RA Leiden
The Netherlands
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