Negative regulation of conserved RSL class I bHLH transcription factors evolved independently among land plants.
Elife
; 72018 08 23.
Article
in En
| MEDLINE
| ID: mdl-30136925
ABSTRACT
Basic helix-loop-helix transcription factors encoded by RSL class I genes control a gene regulatory network that positively regulates the development of filamentous rooting cells - root hairs and rhizoids - in land plants. The GLABRA2 transcription factor negatively regulates these genes in the angiosperm Arabidopsis thaliana. To find negative regulators of RSL class I genes in early diverging land plants we conducted a mutant screen in the liverwort Marchantia polymorpha. This identified FEW RHIZOIDS1 (MpFRH1) microRNA (miRNA) that negatively regulates the RSL class I gene MpRSL1. The miRNA and its mRNA target constitute a feedback mechanism that controls epidermal cell differentiation. MpFRH1 miRNA target sites are conserved among liverwort RSL class I mRNAs but are not present in RSL class I mRNAs of other land plants. These findings indicate that while RSL class I genes are ancient and conserved, independent negative regulatory mechanisms evolved in different lineages during land plant evolution.
Key words
Full text:
1
Database:
MEDLINE
Main subject:
Plant Proteins
/
Conserved Sequence
/
Evolution, Molecular
/
Embryophyta
/
Basic Helix-Loop-Helix Transcription Factors
Type of study:
Prognostic_studies
Language:
En
Journal:
Elife
Year:
2018
Type:
Article
Affiliation country:
United kingdom