Phenotype with AC or Mu gene knock outs

Stephen Dellaporta stephen.dellaporta at yale.edu
Fri Feb 19 12:50:39 EST 1999

The answer depends on how close you look.  At the gross phenotypic level
(seeds, seedlings, plants, etc.) the frequency of detectable recessive and
dominant mutations in ca. 10,000 independent transpositions of Ac is between
5-10%.  The problem is correcting this value for the frequency of mutations
that are Ac-induced.  That is, many of these mutations (over half) are not
caused by Ac but by some other means including Ds transpositions.
Nevertheless, the data does indicate that at least 9 out of 10 independent
Ac insertions lead to no detectable phenotype at the *gross phenotypic

----- Original Message -----
From: keith.edwards <keith.edwards at bbsrc.ac.uk>
Newsgroups: bionet.maize
Sent: Tuesday, February 16, 1999 10:47 AM
Subject: Phenotype with AC or Mu gene knock outs

>Dear All,
>             Given the predicated ancient tetraploid nature of the maize
>genome, I am interested in finding out how often an insertion into a gene
>Ac or Spm or Mu transposon tagging) leads to a detectable phenotype. Our
>preliminary data suggests that we see a phenotype more often than we would
>predicate from the known number of single copy genes in the maize genome.
>Please note that our calculations already assume that Ac, Spm or Mu hits
>transcribed sequences 95% of the time.
>Any help would be appreciated
>Keith Edwards

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