Deletion of the Cochliobolus heterostrophus mating-type (MAT) locus promotes the function of MAT transgenes.

Abstract:

:Cochliobolus heterostrophus has alternate genes (MAT-1 and MAT-2) at its mating-type locus. Transformants of a MAT-1 or a MAT-2 strain carrying a transgene of opposite mating type can self and are dual maters; the transgene, however, promotes development of pseudothecia only, not ascospores. To determine if the resident gene interferes with the function of the transgene, transformation vectors were designed to delete different amounts (2.5 kb, 5.7 kb, and 6.3 kb) of DNA at the MAT locus. Deletions occurred at a higher frequency (about 90% of transformants) with linearized plasmid than with circular plasmid (about 15% of transformants), and all three vectors were equally efficient at gene replacement. Both MAT-1 and MAT-2 could be deleted with the same set of vectors. Re-transformation of deletion strains (regardless of deletion size) with a wild-type copy of MAT restored full mating ability, indicating that the resident MAT gene interferes with function of the MAT transgene. Moreover, sexual development was normal whether the MAT transgene integrated at the homologous or at an ectopic site.

journal_name

Curr Genet

journal_title

Current genetics

authors

Wirsel S,Turgeon BG,Yoder OC

subject

Has Abstract

pub_date

1996-02-01 00:00:00

pages

241-9

issue

3

eissn

0172-8083

issn

1432-0983

journal_volume

29

pub_type

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