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Sequence conservation and divergence in miR164C1 and its target, CUC1, in Brassica species
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Sequence conservation and divergence in miR164C1 and its target, CUC1, in Brassica species
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Journal Article
Sequence conservation and divergence in miR164C1 and its target, CUC1, in Brassica species
2012
Overview
An emerging aspect of plant development and adaptation studies is microRNA (miRNA)-mediated gene regulation and to understand post-transcriptional gene silencing (PTGS) dynamics. Studies performed within an evolutionary context, such as specific plant lineages and genome status (e.g. ploidy level) can highlight the selection pressure and constraints guiding the evolutionary trajectory of regulatory modules. We have investigated conservation and allelic diversity in one such module composed of
CUC1
(
CUP-SHAPED COTYLEDON 1
), a NAC domain family member, and
miR164C
, within
Brassica
species. Ancestral
CUC1
sequences, including those belonging to Amborellales, Nymphaeales and Austrobaileyales, harbour miR164 binding sites, implying an ancient nature of this regulatory module. We found that sequence and length polymorphisms occurred in the
miR164C
precursor of diploid and amphidiploid
Brassica
species, although the 21-nt mature sequence was invariant. In contrast, the target sequence in
CUC1
exhibited polymorphism at the “seed” and “cleavage” site, otherwise governed by stringent rules of pairing for successful PTGS, implying a “relaxed” selection pressure on
CUC1
. Further studies are needed to improve our understanding of the functional implications of the polymorphism and single nucleotide polymorphisms that constitute allelic variation at the region responsible for PTGS within
Brassica
species, in context of ploidy level, and to unravel the evolutionary dynamics of the
miR164C
–
CUC1
regulatory module within the plant kingdom.
Publisher
Springer Japan,Springer Nature B.V,한국식물생명공학회
Subject
/ Biomedical and Life Sciences
/ Brassica
/ Cloning
/ genes
/ Genomes
/ Harbors
/ microRNA
/ single nucleotide polymorphism
/ Studies
/ 농학
