Two functionally identical modular enhancers in Drosophila troponin T gene establish the correct protein levels in different muscle types.

Abstract:

:The control of muscle-specific expression is one of the principal mechanisms by which diversity is generated among muscle types. In an attempt to elucidate the regulatory mechanisms that control fiber diversity in any given muscle, we have focused our attention on the transcriptional regulation of the Drosophila Troponin T gene. Two, nonredundant, functionally identical, enhancer-like elements activate Troponin T transcription independently in all major muscles of the embryo and larvae as well as in adult somatic and visceral muscles. Here, we propose that the differential but concerted interaction of these two elements underlies the mechanism by which a particular muscle-type establish the correct levels of Troponin T expression, adapting these levels to their specific needs. This mechanism is not exclusive to the Troponin T gene, but is also relevant to the muscle-specific Troponin I gene. In conjunction with in vivo transgenic studies, an in silico analysis of the Troponin T enhancer-like sequences revealed that both these elements are organized in a modular manner. Extending this analysis to the Troponin I and Tropomyosin regulatory elements, the two other components of the muscle-regulatory complex, we have discovered a similar modular organization of phylogenetically conserved domains.

journal_name

Mol Biol Cell

authors

Mas JA,García-Zaragoza E,Cervera M

doi

10.1091/mbc.e03-10-0729

keywords:

subject

Has Abstract

pub_date

2004-04-01 00:00:00

pages

1931-45

issue

4

eissn

1059-1524

issn

1939-4586

pii

E03-10-0729

journal_volume

15

pub_type

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