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Published on: April 29, 2011
An Oct-like binding factor regulates Myf-5 expression in primary avian cells
J L Barth1, J Morris, R Ivarie
1Department of Genetics, University of Georgia, Athens, Georgia 30602-7223, USA.
Experimental Cell Research
|March 14, 1998
Summary
Researchers identified key DNA elements regulating Myf-5, a crucial gene for skeletal muscle development. The study reveals the TATA box and an octamer motif (OLS) are vital for Myf-5 gene expression in developing muscle cells.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- Myogenic regulatory factors (MRFs) orchestrate skeletal myogenesis.
- While many MRF promoters are characterized, Myf-5 regulatory elements remain largely unknown.
- Myf-5 is the earliest expressed MRF during mammalian embryogenesis.
Purpose of the Study:
- To identify and characterize the promoter elements regulating the Myf-5 gene.
- To understand the evolutionary conservation of these regulatory elements.
- To investigate the role of these elements in Myf-5 gene expression.
Main Methods:
- Comparative sequence analysis of Myf-5 5' flanking regions (bovine, mouse, chicken).
- Mobility shift assays and DNase I footprinting to identify DNA-binding factors.
- Reporter gene assays (CAT) in avian primary myoblast and fibroblast cultures.
Main Results:
- Three conserved elements near the Myf-5 transcription start site: TATA box, OLS (octamer motif), and a C-rich element.
- A nuclear factor recognizing OLS was identified, cross-reacting with Oct-1 antibody.
- Myf-5 promoter constructs showed preferential expression in myoblasts (12-fold higher than fibroblasts).
- TATA box loss abolished activity; OLS disruption reduced activity by 50-75%.
Conclusions:
- The proximal Myf-5 promoter contains evolutionarily conserved elements critical for its expression.
- The OLS motif, recognized by an Oct-1-related factor, plays a significant role in regulating Myf-5.
- These findings elucidate key regulatory mechanisms for Myf-5, essential for skeletal myogenesis.
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