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THE PLANT CELL, Vol 3, Issue 12 1337-1348, Copyright © 1991 by American Society of Plant Biologists
Analysis of Maize Brittle-1 Alleles and a Defective Suppressor-Mutator-Induced Mutable Allele
T. D. Sullivan, L. I. Strelow, C. A. Illingworth, R. L. Phillips and O. E. Nelson Jr
Laboratory of Genetics, University of Wisconsin, Madison, Wisconsin 53706
A mutant allele of the maize brittle-1 (bt1) locus, brittle-1-mutable
(bt1-m), was shown genetically and molecularly to result from the insertion
of a defective Suppressor-mutator (dSpm) transposable element. An
Spm-hybridizing restriction enzyme fragment, which cosegregates with the
bt1-m allele and is absent from wild-type revertants of bt1-m, was
identified and cloned. Non-Spm portions of it were used as probes to
identify wild-type (Bt1) cDNAs in an endosperm library. The 4.3-kb bt1-m
genomic clone contains a 3.3-kb dSpm, which is inserted in an exon and is
composed of Spm termini flanking non-Spm sequences. RNA gel blot analyses,
using a cloned Bt1 cDNA probe, indicated that Bt1 mRNA is present in the
endosperm of developing kernels and is absent from embryo or leaf tissues.
Several transcripts are produced by bt1-m. The deduced translation product
from a 1.7-kb Bt1 cDNA clone has an apparent plastid transit peptide at its
amino terminus and sequence similarity to several mitochondrial
inner-envelope translocator proteins, suggesting a possible role in
amyloplast membrane transport.
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