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TnIfast IRE enhancer: multistep developmental regulation during skeletal muscle fiber type differentiation.
Dev Dyn. 2002 Aug; 224(4):422-31.DD

Abstract

To identify developmental steps leading to adult skeletal muscle fiber-type-specific gene expression, we carried out transgenic mouse studies of the IRE enhancer of the quail TnIfast gene. Histochemical analysis of IRE/herpesvirus tk promoter/beta-galactosidase reporter transgene expression in adult muscle directly demonstrated IRE-driven fast vs. slow fiber-type specificity, and IIB>IIX>IIA differential expression among the fast fiber types: patterns similar to those of native-promoter TnIfast constructs. These tissue- and cell-type specificities are autonomous to the IRE and do not depend on interactions with a muscle gene promoter. Developmental studies showed that the adult pattern of IRE-driven transgene expression emerges in three steps: (1) activation during the formation of primary embryonic (presumptive slow) muscle fibers; (2) activation, to markedly higher levels, during formation of secondary (presumptive fast) fibers, and (3) differential augmentation of expression during early postnatal maturation of the IIB, IIX, IIA fast fiber types. These results provide insight into the roles of gene activation and gene repression mechanisms in fiber-type specificity and can account for apparently disparate results obtained in previous studies of TnI isoform expression in development. Each of the three IRE-driven developmental steps is spatiotemporally associated with a different major regulatory event at the fast myosin heavy chain gene cluster, suggesting that diverse muscle gene families respond to common, or tightly integrated, regulatory signals during multiple steps of muscle fiber differentiation.

Authors+Show Affiliations

Montreal Neurological Institute, and Department of Biology, McGill University, Montreal, QC, Canada.No affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

12203734

Citation

Hallauer, Patricia L., and Kenneth E M. Hastings. "TnIfast IRE Enhancer: Multistep Developmental Regulation During Skeletal Muscle Fiber Type Differentiation." Developmental Dynamics : an Official Publication of the American Association of Anatomists, vol. 224, no. 4, 2002, pp. 422-31.
Hallauer PL, Hastings KE. TnIfast IRE enhancer: multistep developmental regulation during skeletal muscle fiber type differentiation. Dev Dyn. 2002;224(4):422-31.
Hallauer, P. L., & Hastings, K. E. (2002). TnIfast IRE enhancer: multistep developmental regulation during skeletal muscle fiber type differentiation. Developmental Dynamics : an Official Publication of the American Association of Anatomists, 224(4), 422-31.
Hallauer PL, Hastings KE. TnIfast IRE Enhancer: Multistep Developmental Regulation During Skeletal Muscle Fiber Type Differentiation. Dev Dyn. 2002;224(4):422-31. PubMed PMID: 12203734.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - TnIfast IRE enhancer: multistep developmental regulation during skeletal muscle fiber type differentiation. AU - Hallauer,Patricia L, AU - Hastings,Kenneth E M, PY - 2002/8/31/pubmed PY - 2003/4/8/medline PY - 2002/8/31/entrez SP - 422 EP - 31 JF - Developmental dynamics : an official publication of the American Association of Anatomists JO - Dev Dyn VL - 224 IS - 4 N2 - To identify developmental steps leading to adult skeletal muscle fiber-type-specific gene expression, we carried out transgenic mouse studies of the IRE enhancer of the quail TnIfast gene. Histochemical analysis of IRE/herpesvirus tk promoter/beta-galactosidase reporter transgene expression in adult muscle directly demonstrated IRE-driven fast vs. slow fiber-type specificity, and IIB>IIX>IIA differential expression among the fast fiber types: patterns similar to those of native-promoter TnIfast constructs. These tissue- and cell-type specificities are autonomous to the IRE and do not depend on interactions with a muscle gene promoter. Developmental studies showed that the adult pattern of IRE-driven transgene expression emerges in three steps: (1) activation during the formation of primary embryonic (presumptive slow) muscle fibers; (2) activation, to markedly higher levels, during formation of secondary (presumptive fast) fibers, and (3) differential augmentation of expression during early postnatal maturation of the IIB, IIX, IIA fast fiber types. These results provide insight into the roles of gene activation and gene repression mechanisms in fiber-type specificity and can account for apparently disparate results obtained in previous studies of TnI isoform expression in development. Each of the three IRE-driven developmental steps is spatiotemporally associated with a different major regulatory event at the fast myosin heavy chain gene cluster, suggesting that diverse muscle gene families respond to common, or tightly integrated, regulatory signals during multiple steps of muscle fiber differentiation. SN - 1058-8388 UR - https://www.unboundmedicine.com/medline/citation/12203734/TnIfast_IRE_enhancer:_multistep_developmental_regulation_during_skeletal_muscle_fiber_type_differentiation_ L2 - https://doi.org/10.1002/dvdy.10122 DB - PRIME DP - Unbound Medicine ER -