Regulatory elements governing transcription in specialized myofiber subtypes.

Journal Article (Journal Article)

Skeletal myofibers of vertebrates acquire specialized metabolic and physiological properties as a consequence of developmental cues in the embryo and different patterns of contractile activity in the adult. The myoglobin gene is regulated stringently in muscle fibers, such that high myoglobin expression is observed in mitochondria-rich, oxidative myofibers (Types I and IIa) compared with glycolytic fibers (Type IIb). Using germ-line transgenesis and somatic cell gene transfer methods, we defined discrete regions of the murine and human genes encoding myoglobin that are sufficient to confer muscle- and fiber type-specific expression to reporter genes. Mutational analysis confirms the importance of A/T-rich, MEF2-binding motifs in myoglobin gene regulation, as suggested by previous studies using different experimental approaches. In addition, we demonstrated a previously unsuspected role for an intragenic E-box motif as a negative regulatory element contributing to the tightly regulated variation in myoglobin gene expression among particular myofiber subtypes.

Full Text

Duke Authors

Cited Authors

  • Yan, Z; Serrano, AL; Schiaffino, S; Bassel-Duby, R; Williams, RS

Published Date

  • May 18, 2001

Published In

Volume / Issue

  • 276 / 20

Start / End Page

  • 17361 - 17366

PubMed ID

  • 11279187

International Standard Serial Number (ISSN)

  • 0021-9258

Digital Object Identifier (DOI)

  • 10.1074/jbc.M101251200


  • eng

Conference Location

  • United States