Genetic Background Alters Dominance Relationships between mat Alleles in the Ciliate Tetrahymena thermophila | Zendy

Sujal Phadke | Zendy; Tiago Paixão | Zendy; Therese Pham | Zendy; S. Pham | Zendy; Rebecca A. Zufall | Zendy

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Genetic Background Alters Dominance Relationships between mat Alleles in the Ciliate Tetrahymena thermophila

Author(s) -

Sujal Phadke,

Tiago Paixão,

Therese Pham,

S. Pham,

Rebecca A. Zufall

Publication year - 2013

Publication title -

journal of heredity

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.99

H-Index - 92

eISSN - 1471-8505

pISSN - 0022-1503

DOI - 10.1093/jhered/est063

Subject(s) - biology , tetrahymena , ciliate , allele , dominance (genetics) , genetics , evolutionary biology , ciliata , heterozygote advantage , gene , protozoa

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.

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