Madrid, 26 Jan. (EUROPA PRESS) .- Many organisms, including insects, amphibians and jackets, use sex pneumonia to attract people from the opposite sex, but what happens with sexual ferries when new species arises?
New research published on Tuesday in "PLOS Biology" by Taisuke Seike and Hironori Niki, at the National Institute of Genetics in Japan and Chikashi Shimoda, at Osaka City, Japan, studied sexual pneumonia in yeast of fission Schizosaccharomyces pombe & # 39 ;, revealing a system of asymmetric feromone recognition, in which one phenomenon works extremely strict, while the other free pest is experiencing a certain variety, which may lead to a first step to a specialty
New species can occur when two populations can no longer cross, and this is called breeding isolation, which limits the flow of genes between populations, is one of the key mechanisms of a specialty. Mutual changes of the Beromone system can influence the ability of men and women to recognize each other, resulting in breeding isolation; More generally, however, the loss of the feromone activity can result in the extinction of the body's lineage. The lower mechanisms that lead to the diversification of pheromones within populations are not well understood.
The two sexes ("Plus" and "Minus") of & # 39; S. Pombe each separates pheromone ("P-pheromone" and "M-pheromone"), which binds to a corresponding receptor in the cells of the opposite sex. Exploring the similarities and differences between the genes encoding the two pheromons and their receptors in 150 wild onions of S. Pombe, from different geographic origins, researchers found that M-feromone and its receptor are completely invariant, while P-pherom and its receiver are very different in the chains explored. Peculiarly, such asymmetric diversification of the two ferries is also observed in the closely related fission species & s. Octosporo. & # 39;
The authors speculate that the "asymmetric" system in fission yeast could allow flexible adaptations to the mutations of the pheromones, while maintaining strict recognition to the interlocutors. In fact, the previous study of the authorization of yeast fission & S. Pombe "has proven experimentally that several mutations in pneumonia and its corresponding receptor can lead to breeding isolation, which can as well lead to a new species.
"Our findings contribute to new information on the development of the mechanisms under the diversification of the pheromones. Organisms can have these systems to create new pheromena versions, allowing them to persist in a long time in the population to develop the adaptations of the receivers," says Seike. Before a mutant is completely lost, you can produce a second repressive mutation to recover the first damage. Therefore, the co-evolution of the pheromones / receptors can progress gradually.