Genetic background alters dominance relationships between mat alleles in the ciliate Tetrahymena Thermophila Journal Article


Author(s): Phadke, Sujal S; Paixão, Tiago; Pham, Tuan; Pham, Stephanie; Zufall, Rebecca A
Article Title: Genetic background alters dominance relationships between mat alleles in the ciliate Tetrahymena Thermophila
Affiliation IST Austria
Abstract: The pattern of inheritance and mechanism of sex determination can have important evolutionary consequences. We studied probabilistic sex determination in the ciliate Tetrahymena thermophila, which was previously shown to cause evolution of skewed sex ratios. We find that the genetic background alters the sex determination patterns of mat alleles in heterozygotes and that allelic interaction can differentially influence the expression probability of the 7 sexes. We quantify the dominance relationships between several mat alleles and find that A-type alleles, which specify sex I, are indeed recessive to B-type alleles, which are unable to specify that sex. Our results provide additional support for the presence of modifier loci and raise implications for the dynamics of sex ratios in populations of T. thermophila.
Keywords: Ciliate; Inheritance; Mating type; Sex determination; Sex ratio
Journal Title: Journal of Heredity
Volume: 105
Issue 1
ISSN: 1465-7333
Publisher: Oxford University Press  
Date Published: 2014-01-01
Start Page: 130
End Page: 135
DOI: 10.1093/jhered/est063
Notes: We are grateful to R. Azevedo for helpful advice during the study and 2 anonymous reviewers for helpful suggestions.
Open access: no
IST Austria Authors
  1. Tiago Paixão
    27 Paixão
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