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« Previous Abstract"Coding genes and molecular structures of the diffusible signalling proteins (pheromones) of the polar ciliate, Euplotes nobilii"    Next AbstractInfluence of an innovative and promising gas clarification process on the quality of stored extra virgin olive oils »

J Eukaryot Microbiol


Title:"Evidence for gene duplication and allelic codominance (not hierarchical dominance) at the mating-type locus of the ciliate, Euplotes crassus"
Author(s):Vallesi A; Alimenti C; Federici S; Di Giuseppe G; Dini F; Guella G; Luporini P;
Address:"Laboratory of Eukaryotic Microbiology and Animal Biology, University of Camerino, 62032, Camerino, MC, Italy"
Journal Title:J Eukaryot Microbiol
Year:2014
Volume:20140804
Issue:6
Page Number:620 - 629
DOI: 10.1111/jeu.12140
ISSN/ISBN:1550-7408 (Electronic) 1066-5234 (Linking)
Abstract:"The high-multiple mating system of Euplotes crassus is known to be controlled by multiple alleles segregating at a single locus and manifesting relationships of hierarchical dominance, so that heterozygous cells would produce a single mating-type substance (pheromone). In strain L-2D, now known to be homozygous at the mating-type locus, we previously identified two pheromones (Ec-alpha and Ec-1) characterized by significant variations in their amino acid sequences and structure of their macronuclear coding genes. In this study, pheromones and macronuclear coding genes have been analyzed in strain POR-73 characterized by a heterozygous genotype and strong mating compatibility with L-2D strain. It was found that POR-73 cells contain three distinct pheromone coding genes and, accordingly, secrete three distinct pheromones. One pheromone revealed structural identity in amino acid sequence and macronuclear coding gene to the Ec-alpha pheromone of L-2D cells. The other two pheromones were shown to be new and were designated Ec-2 and Ec-3 to denote their structural homology with the Ec-1 pheromone of L-2D cells. We interpreted these results as evidence of a phenomenon of gene duplication at the E. crassus mating-type locus, and lack of hierarchical dominance in the expression of the macronuclear pheromone genes in cells with heterozygous genotypes"
Keywords:Alleles Amino Acid Sequence Ciliophora/*genetics *Gene Duplication Molecular Sequence Data Pheromones/*genetics Reproduction Cell chemical signals ciliate mating types conjugation macronuclear gene-size DNA molecules protein pheromones;
Notes:"MedlineVallesi, Adriana Alimenti, Claudio Federici, Sergio Di Giuseppe, Graziano Dini, Fernando Guella, Graziano Luporini, Pierangelo eng Research Support, Non-U.S. Gov't 2014/07/22 J Eukaryot Microbiol. 2014 Nov-Dec; 61(6):620-9. doi: 10.1111/jeu.12140. Epub 2014 Aug 4"

 
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Citation: El-Sayed AM 2024. The Pherobase: Database of Pheromones and Semiochemicals. <http://www.pherobase.com>.
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