Article ; Online: Selfing mutants link Ku proteins to mating type determination in Tetrahymena.
2020 Volume 18, Issue 8, Page(s) e3000756
Abstract: Recognition of self and nonself is important for outcrossing organisms, and different mating types establish the barrier against self-mating. In the unicellular ciliate T. thermophila, mating type determination requires complex DNA rearrangements at a ... ...
Abstract | Recognition of self and nonself is important for outcrossing organisms, and different mating types establish the barrier against self-mating. In the unicellular ciliate T. thermophila, mating type determination requires complex DNA rearrangements at a single mat locus during conjugation to produce a type-specific gene pair (MTA and MTB) for 1 of 7 possible mating types. Surprisingly, we found that decreased expression of the DNA breakage-repair protein Ku80 at late stages of conjugation generated persistent selfing phenotype in the progeny. DNA analysis revealed multiple mating-type gene pairs as well as a variety of mis-paired, unusually arranged mating-type genes in these selfers that resemble some proposed rearrangement intermediates. They are found also in normal cells during conjugation and are lost after 10 fissions but are retained in Ku mutants. Silencing of TKU80 or TKU70-2 immediately after conjugation also generated selfing phenotype, revealing a hidden DNA rearrangement process beyond conjugation. Mating reactions between the mutant and normal cells suggest a 2-component system for self-nonself-recognition through MTA and MTB genes. |
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MeSH term(s) | Conjugation, Genetic ; Crosses, Genetic ; DNA, Protozoan/genetics ; DNA, Protozoan/metabolism ; Gene Expression ; Gene Rearrangement ; Gene Silencing ; Ku Autoantigen/genetics ; Ku Autoantigen/metabolism ; Phenotype ; Protozoan Proteins/genetics ; Protozoan Proteins/metabolism ; Reproduction ; Tetrahymena thermophila/genetics ; Tetrahymena thermophila/metabolism |
Chemical Substances | DNA, Protozoan ; Protozoan Proteins ; Ku Autoantigen (EC 4.2.99.-) |
Language | English |
Publishing date | 2020-08-03 |
Publishing country | United States |
Document type | Journal Article ; Research Support, Non-U.S. Gov't |
ZDB-ID | 2126776-5 |
ISSN | 1545-7885 ; 1544-9173 |
ISSN (online) | 1545-7885 |
ISSN | 1544-9173 |
DOI | 10.1371/journal.pbio.3000756 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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