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Inter- and intra-population variability of the protein content of femoral gland secretions from a lacertid lizard

Current Zoology 2017年第6期63卷 657-665页

作者： Marco MANGIACOTTI Marco FUMAGALLI Stefano SCALI Marco A.L. ZUFFI Maddalena CAGNONE Roberta SALVINI Roberto SACCHI Department of Earth and Environmental Sciences University of Pavia Via Taramelli 24 Pavia 1-27100 Italy Museo Civico di Storia Naturale di Milano Corso Venezia 55 Milano 1-20121 Italy Department of Biology and Biotechnology "L. Spallanzani" Biochemistry Unit University of Pavia Via Taramelli 3 Pavia 1-27100 Italy Museo di Storia Naturale Universita di Pisa Via Roma 79 Calci Pisa 1-56011 Italy Department of Molecular Medicine Biochemistry Unit University of Pavia Via Taramelli 3 Pavia 1-27100 Italy

femoral glands of male lizards produce waxy secretions that are involved in inter- and intraspecific chemical communication. The main components of these secretions are proteins and lipids, the latter having been extensively studied and already associated to male quality. On the opposite, the composition and role of proteins are nearly unknown, the only available information coming from few studies on iguanids. These studies got the conclusion that proteins might have a communicative function, notably they could signal individual identity. A generalization of these findings requires the extension of protein analysis to other lizard families, and the primary detection of some patterns of individual variability. Using the common wall lizard Podarcis muralis as a model species, the protein fraction of the femoral pore secretions was investigated to provide the first characterization of this component in a lacertid lizard and to explore its source of variability, as a first step to support the hypothesized communicative role. Samples of proteins from femoral secretions were collected from 6 Italian populations and subjected to 1-dimensional electrophoresis. The binary vector of the band presence/absence was used to define the individual profiles. Protein fraction is found to have a structured pattern, with both an individual and a population component. Although the former supports the potential communicative role of proteins, the latter offers a double interpretation, phylogenetic or environmental, even though the phylogenetic effect seems more likely given the climatic resemblance of the considered sites. Further studies are necessary to shed light on both these issues.

关键词： chemical communication femoral glands lizards Podarcis muralis proteins SDS-PAGE.

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