NDLI: Rapid Evolution of Plethodontid Modulating Factor, a Hypervariable Salamander Courtship Pheromone, is Driven by Positive Selection

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Rapid Evolution of Plethodontid Modulating Factor, a Hypervariable Salamander Courtship Pheromone, is Driven by Positive Selection

Content Provider	Springer Nature Link
Author	Palmer, Catherine A. Watts, Richard A. Hastings, Amy P. Houck, Lynne D. Arld, Stevan J.
Copyright Year	2010
Abstract	Sexual communication in plethodontid salamanders is mediated by a proteinaceous pheromone that a male delivers to a female during courtship, boosting her receptivity. The pheromone consists of three proteins from three unrelated protein families. These proteins are among a small group of pheromones known to affect female receptivity in vertebrates. Previously, we showed that the genes of two of these proteins (PRF and SPF) are prone to incessant evolution driven by positive selection, presumably as a consequence of coevolution with female receptors. In this report, we focus on the evolution of the third pheromone protein gene family, plethodontid modulating factor (PMF), to determine whether it shows the same pattern of diversification. We used RT-PCR in mental gland cDNA to survey PMF sequences from three genera of plethodontid salamanders (27 spp.) to measure rates of evolution, level of gene diversification, modes of selection, and types of amino acid substitution. Like PRF and SPF, PMF is produced by a multigene family characterized by gene duplication and high levels of polymorphism. PMF evolution is rapid, incessant, and driven by positive selection. PMF is more extreme in these dimensions than both PRF and SPF. Nestled within this extraordinary variation, however, is a signature of purifying selection, acting to preserve important structural and biochemical features of the PMF protein (i.e., secretion signal, cysteine residues, and pI). Although a pattern of persistent diversification exists at the molecular level, the morphological and behavioral aspects of the pheromone delivery system show evolutionary stasis over millions of years.
Starting Page	427
Ending Page	440
Page Count	14
File Format	PDF
ISSN	00222844
Journal	Journal of Molecular Evolution
Volume Number	70
Issue Number	5
e-ISSN	14321432
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-04-21
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pheromone gene Rapid evolution Positive selection Reproductive protein Courtship signal Sexual communication Animal Genetics and Genomics Plant Genetics & Genomics Plant Sciences Microbiology Evolutionary Biology Cell Biology
Content Type	Text
Resource Type	Article
Subject	Genetics Molecular Biology Ecology, Evolution, Behavior and Systematics

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Rapid Evolution of Plethodontid Modulating Factor, a Hypervariable Salamander Courtship Pheromone, is Driven by Positive Selection

Rapid Evolution of Plethodontid Modulating Factor, a Hypervariable Salamander Courtship Pheromone, is Driven by Positive Selection

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A Recombinant Courtship Pheromone Affects Sexual Receptivity in a Plethodontid Salamander

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Rapid Evolution of Plethodontid Modulating Factor, a Hypervariable Salamander Courtship Pheromone, is Driven by Positive Selection

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