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TMT analysis of proteomic changes in the gastrocnemius skeletal muscles of WT and Bmal1-KO mice, and Bmal1-KO mice rescued with AAV-mediated muscle-specific expression of Bmal1.

ABSTRACT: TMT analysis of proteomic changes in the gastrocnemius skeletal muscles of WT and Bmal1-KO mice, and Bmal1-KO mice rescued with AAV-mediated muscle-specific expression of Bmal1.

INSTRUMENT(S): Orbitrap Fusion

ORGANISM(S): Mus Musculus (mouse)

SUBMITTER: Vishwajeeth Pagala

LAB HEAD: Fabio Demontis

PROVIDER: PXD054406 | Pride | 2024-10-03

REPOSITORIES: Pride

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			Action	DRS
	Demongrp_100219_TMT_F1.1.pepXML	Pepxml
	Demongrp_100219_TMT_F1.mzXML	Mzxml
	Demongrp_100219_TMT_F1.raw	Raw
	Demongrp_100219_TMT_F10.1.pepXML	Pepxml
	Demongrp_100219_TMT_F10.mzXML	Mzxml

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Project description:To define regulation of tissue proteomes by Bmal1, daily feeding rhythm, and the interaction, we employed Bmal1-stopFL mice, which do not express the main transcriptional activator of the molecular clock, Bmal1, except in cre recombinase-expressing cells1,2 (Figure 1A). Bmal1-stopFL mice lacking cre (Bmal1 knockout, KO) are analogous to Bmal1-null mice and display severely impaired behavioral and molecular rhythms1-3. Hepatocyte-specific Alfp-cre and skeletal muscle-specific Hsa-cre genes were introduced to generate a single line wherein both hepatocyte and skeletal muscle Bmal1 were reconstituted (Liver+Muscle-RE), i.e., rescued (Smith, Koronowski et al. 2023). This approach had the benefit of analyzing liver and muscle from the same mice but comes with the qualification that the abundance of some proteins may be influenced by Bmal1 function in the other tissue, or by a synergistic effect of Bmal1 in both tissues, rather than through rescue of local Bmal1 function alone. Proteomic anlaysis was performed in liver and skeletal muscle.

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Bmal1 controls circadian cell proliferation and susceptibility to UVB-induced DNA damage in the epidermis [Bmal1 KO]

Project description:While several physiological skin parameters vary in a circadian manner, the identity of genes participating in chronobiology of skin remains unknown, leading us to define the circadian transcriptome of mouse skin at two different stages of the hair cycle, telogen and anagen. The circadian transcriptomes of telogen and anagen skin are largely distinct, with the former dominated by genes involved in cell proliferation and metabolism. The expression of many metabolic genes is antiphasic to cell cycle related genes, the former peaking during the day and the latter peaking at the night. Consistently, accumulation of reactive oxygen species, a byproduct of oxidative phosphorylation, and S-phase are antiphasic to each other in telogen skin. Furthermore, the circadian variation in S-phase is controlled by BMAL1 intrinsic to keratinocytes as keratinocyte-specific deletion of Bmal1 obliterates time of day dependent synchronicity of cell division in the epidermis leading to a constitutively elevated cell proliferation. Consistent with higher cellular susceptibility to UV-induced DNA damage during S phase, we found that mice are most sensitive to UVB-induced DNA damage in the epidermis at night. As maximum numbers of keratinocytes go through S phase in the late afternoon in the human epidermis, we speculate that in humans the circadian clock imposes regulation of epidermal cell proliferation such that skin is at a particularly vulnerable stage during times of maximum UV exposure, thus contributing to the high incidence of human skin cancers. Whole skin was collected at ZT22. Where ZT number indicates the number of hours elapsed from when lights are switched on. ZT0 = lights on (6am). ZT12=lights off (6pm). Het mice designate a presence of one Bmal1 mutant allele and one wt allele. KO mice designate mice germline deleted for both copies of Bmal1 allele. Total RNA was purified from the skin of each biological littermate replicate.

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