Abstract
MYB transcription factors (TFs) make up one of the most important TF families in plants. These proteins play crucial roles in processes related to development, metabolism, and stimulus-response; however, very few studies have been reported for the characterization of MYB TFs from banana. The current study identified 305 and 251 MYB genes from Musa acuminata and Musa balbisiana, respectively. Comprehensive details of MYBs are reported in terms of gene structure, protein domain, chromosomal localization, phylogeny, and expression patterns. Based on the exon–intron arrangement, these genes were classified into 12 gene models. Phylogenetic analysis of MYBs involving both species of banana, Oryza sativa, and Arabidopsis thaliana distributed these genes into 27 subfamilies. This highlighted not only the conservation, but also the gain/loss of MYBs in banana. Such genes are important candidates for future functional investigations. The MYB genes in both species exhibited a random distribution on chromosomes with variable densities. Estimation of gene duplication events revealed that segmental duplications represented the major factor behind MYB gene family expansion in banana. Expression profiles of MYB genes were also explored for their potential involvement in acetylene response or development. Collectively, the current comprehensive analysis of MYB genes in both species of banana will facilitate future functional studies.
Highlights
Transcription factors (TFs) perform an essential role in the regulation of gene expression by suppressing or activating their target genes to control various phases of plant development and growth [1]
The MYB domain sequences of Oryza sativa and Arabidopsis thaliana were employed as a query for the identification of MYB proteins present in the genomes of M. acuminata and M. balbisiana
After carefully surveying the M. acuminata and M. balbisiana MYB proteins and confirming the conserved characteristics of motifs and domains, 305 non-redundant MYBs were predicted in M. acuminata and 251 in M. balbisiana
Summary
Transcription factors (TFs) perform an essential role in the regulation of gene expression by suppressing or activating their target genes to control various phases of plant development and growth [1]. The members of the MYB family contain a highly conserved and distinctive N-terminal DNA-binding or protein-protein interaction domain that typically bears one to four imperfect repeats of a particular sequence (termed R1, R2, R3, and R4) and three α-helices. The second and third helices form a special structure called a helix–turn–helix (HTH) that binds to the major grooves of DNA [4,5]. The C terminal region of the MYB domain is greatly divergent. It acts as an activation domain for the wide-ranging roles of the MYB family [6]. The number of repeats in the MYB domain is used as a Plants 2020, 9, 413; doi:10.3390/plants9040413 www.mdpi.com/journal/plants
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