Coen ES et al. 1988
- Authors:
Coen ES. Carpenter R.
- Title:
A semi-dominant allele, niv-525, acts in trans to inhibit expression of
its wild-type homologue in Antirrhinum majus.
- Reference location:
EMBO Journal. 7(4):877-83, 1988 Apr.
- Abstract:
Niv-525 is a semi-dominant allele of the nivea locus, which encodes the
enzyme chalcone synthase required for flower pigment biosynthesis in
Antirrhinum majus. Plants heterozygous for niv-525 and wild-type (Niv+)
allele, have flowers with a reduced intensity and novel spatial pattern of
pigmentation compared with Niv+ homozygotes. In heterozygotes, niv-525
acts in trans to reduce the steady-state level of nivea transcript
produced by its Niv+ homologue and hence the quantity of chalcone synthase
protein. Niv-525 carries an inverted duplication of 207 bp in its promoter
region which has arisen following excision of the transposable element Tam
3. This structure can be explained by a model of plant transposable
element excision that involves resolution of two hairpin DNA molecules.
Possible mechanisms for the trans-acting effect of niv-525 and its
relationship to other examples of allelic interactions, such as
transvection in Drosophila melanogaster, are discussed.
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