Two portable recombination enhancers direct donor choice in fission yeast heterochromatin
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Two portable recombination enhancers direct donor choice in fission yeast heterochromatin. / Jakociunas, Tadas; Holm, Lærke Rebekka; Hansen, Janne Verhein; Trusina, Ala; Thon, Genevieve.
I: P L o S Genetics, Bind 9, Nr. 10, e1003762, 2013.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Two portable recombination enhancers direct donor choice in fission yeast heterochromatin
AU - Jakociunas, Tadas
AU - Holm, Lærke Rebekka
AU - Hansen, Janne Verhein
AU - Trusina, Ala
AU - Thon, Genevieve
PY - 2013
Y1 - 2013
N2 - Mating-type switching in fission yeast results from gene conversions of the active mat1 locus by heterochromatic donors. mat1 is preferentially converted by mat2-P in M cells and by mat3-M in P cells. Here, we report that donor choice is governed by two portable recombination enhancers capable of promoting use of their adjacent cassette even when they are transposed to an ectopic location within the mat2-mat3 heterochromatic domain. Cells whose silent cassettes are swapped to mat2-M mat3-P switch mating-type poorly due to a defect in directionality but cells whose recombination enhancers were transposed together with the cassette contents switched like wild type. Trans-acting mutations that impair directionality affected the wild-type and swapped cassettes in identical ways when the recombination enhancers were transposed together with their cognate cassette, showing essential regulatory steps occur through the recombination enhancers. Our observations lead to a model where heterochromatin biases competitions between the two recombination enhancers to achieve directionality.
AB - Mating-type switching in fission yeast results from gene conversions of the active mat1 locus by heterochromatic donors. mat1 is preferentially converted by mat2-P in M cells and by mat3-M in P cells. Here, we report that donor choice is governed by two portable recombination enhancers capable of promoting use of their adjacent cassette even when they are transposed to an ectopic location within the mat2-mat3 heterochromatic domain. Cells whose silent cassettes are swapped to mat2-M mat3-P switch mating-type poorly due to a defect in directionality but cells whose recombination enhancers were transposed together with the cassette contents switched like wild type. Trans-acting mutations that impair directionality affected the wild-type and swapped cassettes in identical ways when the recombination enhancers were transposed together with their cognate cassette, showing essential regulatory steps occur through the recombination enhancers. Our observations lead to a model where heterochromatin biases competitions between the two recombination enhancers to achieve directionality.
U2 - 10.1371/journal.pgen.1003762
DO - 10.1371/journal.pgen.1003762
M3 - Journal article
C2 - 24204285
VL - 9
JO - P L o S Genetics
JF - P L o S Genetics
SN - 1553-7390
IS - 10
M1 - e1003762
ER -
ID: 72133199