Rapid adaptation of cellular metabolic rate to the MicroRNA complements of mammals and its relevance to the evolution of endothermy
Permanent lenke
https://hdl.handle.net/10037/34494Dato
2023-12-21Type
Journal articleTidsskriftartikkel
Peer reviewed
Sammendrag
The metabolic efficiency of mammalian cells depends on the attenuation of intrinsic translation noise by
microRNAs. We devised a metric of cellular metabolic rate (cMR), rMR/Mexp optimally fit to the number
of microRNA families (mirFam), that is robust to variation in mass and sensitive to body temperature
(Tb), consistent with the heat dissipation limit theory of Speakman and Kro´ l (2010). Using mirFam as predictor, an Ornstein-Uhlenbeck process of stabilizing selection, with an adaptive shift at the divergence of
Boreoeutheria, accounted for 95% of the variation in cMR across mammals. Branchwise rates of evolution
of cMR, mirFam and Tb concurrently increased 6- to 7-fold at the divergence of Boreoeutheria, indepen dent of mass. Cellular MR variation across placental mammals was also predicted by the sum of model
conserved microRNA-target interactions, revealing an unexpected degree of integration of the microRNA-target apparatus into the energy economy of the mammalian cell.
Forlag
ElsevierSitering
Fromm, Sorger. Rapid adaptation of cellular metabolic rate to the MicroRNA complements of mammals and its relevance to the evolution of endothermy. iScience. 2024;27(2)Metadata
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