Relaxed constraint and functional divergence of the progesterone receptor (PGR) in the human stem-lineage

The steroid hormone progesterone, acting through the progesterone receptor (PR), a ligand-activated DNA-binding transcription factor, plays an essential role in regulating nearly every aspect of female reproductive biology. While many reproductive traits regulated by PR are conserved in mammals, Cat...

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Veröffentlicht in:PLoS genetics 2020-04, Vol.16 (4), p.e1008666-e1008666
Hauptverfasser: Marinić, Mirna, Lynch, Vincent J
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description The steroid hormone progesterone, acting through the progesterone receptor (PR), a ligand-activated DNA-binding transcription factor, plays an essential role in regulating nearly every aspect of female reproductive biology. While many reproductive traits regulated by PR are conserved in mammals, Catarrhine primates evolved several derived traits including spontaneous decidualization, menstruation, and a divergent (and unknown) parturition signal, suggesting that PR may also have evolved divergent functions in Catarrhines. There is conflicting evidence, however, whether the progesterone receptor gene (PGR) was positively selected in the human lineage. Here we show that PGR evolved rapidly in the human stem-lineage (as well as other Catarrhine primates), which likely reflects an episode of relaxed selection intensity rather than positive selection. Coincident with the episode of relaxed selection intensity, ancestral sequence resurrection and functional tests indicate that the major human PR isoforms (PR-A and PR-B) evolved divergent functions in the human stem-lineage. These results suggest that the regulation of progesterone signaling by PR-A and PR-B may also have diverged in the human lineage and that non-human animal models of progesterone signaling may not faithfully recapitulate human biology.
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subjects Amino acids
Animal models
Animals
Biology and Life Sciences
Datasets
Divergence
Earth Sciences
Evolution
Evolution, Molecular
Gene expression
Genomes
Hominids
Humans
Isoforms
Ligands
Menstruation
Models, Genetic
Parturition
Phylogeny
Physical Sciences
Positive selection
Pregnancy
Primates - classification
Primates - genetics
Progesterone
Receptors, Progesterone - genetics
Research and Analysis Methods
Selection, Genetic
Social Sciences
title Relaxed constraint and functional divergence of the progesterone receptor (PGR) in the human stem-lineage
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