Journal
SCIENCE
Volume 314, Issue 5803, Pages 1304-1308Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1132430
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Funding
- Howard Hughes Medical Institute Funding Source: Medline
- NIEHS NIH HHS [R01 ES005703] Funding Source: Medline
- NIMH NIH HHS [P50 MH074924] Funding Source: Medline
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The basic helix-loop-helix ( bHLH) - Per-Arnt-Sim ( PAS) domain transcription factor BMAL1 is an essential component of the mammalian circadian pacemaker. Bmal1(-/-) mice lose circadian rhythmicity but also display tendon calcification and decreased activity, body weight, and longevity. To investigate whether these diverse functions of BMAL1 are tissue-specific, we produced transgenic mice that constitutively express Bmal1 in brain or muscle and examined the effects of rescued gene expression in Bmal1(-/-) mice. Circadian rhythms of wheel-running activity were restored in brain-rescued Bmal1(-/-) mice in a conditional manner; however, activity levels and body weight were lower than those of wild-type mice. In contrast, muscle-rescued Bmal1(-/-) mice exhibited normal activity levels and body weight yet remained behaviorally arrhythmic. Thus, Bmal1 has distinct tissue-specific functions that regulate integrative physiology.
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