The investigators aimed to characterize human circadian clockwork in healthy individuals in comparison to obese and type 2 diabetic subjects, employing the noninvasive experimental approach allowing the study of circadian profile in human individuals.
The investigators specifically aim to obtain and analyze the circadian profile of skin fibroblasts from healthy, obese and T2D subjects. Does circadian oscillator profile and its parameters (phase, period and amplitude) will differ between healthy individuals and obese/ T2D patients? Skin biopsy will be performed in order to collect and culture skin fibroblast cells. In vivo bioluminescence recording will be performed in primary human skin fibroblast cells. The profiles obtained from 10 subjects in each group will be compared to their healthy counterparts. Bmal1and Per2 are clock genes. Lentiviral transduction of Bmal1-luciferase or Per2-luciferase in fibroblasts allow observation of circadian oscillations using bioluminescence assay. Phase, period length and amplitude are used to characterize the circadian rhythm.
Study Type
OBSERVATIONAL
Enrollment
300
A 2mm diameter skin biopsy is performed by a physician using standard procedure.
Geneva University Hospital
Geneva, Switzerland
Difference of period length
Period length will be calculated from oscillation profiles of Bmal1-luciferase or Per2-luc luciferase.
Time frame: 5 days
Difference of amplitude
Amplitude will be calculated from oscillation profiles of Bmal1-luciferase or Per2-luc luciferase.
Time frame: 5 days
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