Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 387493
Title The origin of a selfish B chromosome triggering paternal sex ratio in the parasitoid wasp Trichogramma kaykai
Author(s) Vugt, J.J.F.A. van; Jong, J.H.S.G.M. de; Stouthamer, R.
Source Proceedings of the Royal Society. B: Biological Sciences 276 (2009)1676. - ISSN 0962-8452 - p. 4149 - 4154.
Department(s) Laboratory of Genetics
Laboratory of Entomology
Publication type Refereed Article in a scientific journal
Publication year 2009
Keyword(s) ribosomal-rna genes - nasonia-vitripennis - brachycome-dichromosomatica - insitu hybridization - crepis-capillaris - dna-sequences - evolution - parthenogenesis - hymenoptera - psr
Abstract This study uses molecular and cytogenetic methods to determine the origin of a B chromosome in some males of the wasp Trichogramma kaykai. This so-called paternal sex ratio (PSR) chromosome transmits only through sperm and shortly after fertilization triggers degeneration of the paternal genome, while keeping itself intact. The resulting embryos develop into haploid B-chromosome-carrying males. Another PSR chromosome with a very similar mode of action is found in the distantly related wasp Nasonia vitripennis and its origin was traced by transposon similarity to the genus Trichomalopsis, which is closely related to Nasonia. To determine whether both PSR chromosomes have a similar origin we aimed to reveal the origin of the Trichogramma PSR chromosome. Using fluorescent in situ hybridization, we discovered a major satellite repeat on the PSR chromosome, the 45S ribosomal DNA. Analysis of the internal transcribed spacer 2 (ITS2) of this repeat showed the presence of multiple ITS2 sequences on the PSR chromosome resembling either the ITS2 of T. oleae or of T. kaykai. We therefore conclude that the Trichogramma PSR chromosome originates from T. oleae or a T. oleae-like species. Our results are consistent with different origins for the PSR chromosomes in Trichogramma and Nasonia
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