A haploid system of sex determination in the brown alga Ectocarpus sp.

dc.contributor.authorAhmed, Sophia
dc.contributor.authorCock, J. Mark
dc.contributor.authorPessia, Eugenie
dc.contributor.authorLuthringer, Remy
dc.contributor.authorCormier, Alexandre
dc.contributor.authorRobuchon, Marine
dc.contributor.authorSterck, Lieven
dc.contributor.authorPeters, Akira F.
dc.contributor.authorDittami, Simon M.
dc.contributor.authorCorre, Erwan
dc.contributor.authorValero, Myriam
dc.contributor.authorAury, Jean-Marc
dc.contributor.authorRoze, Denis
dc.contributor.authorVan de Peer, Yves
dc.contributor.authorBothwell, John
dc.contributor.authorMarais, Gabriel A.B.
dc.contributor.authorCoelho, Susana M.
dc.date.accessioned2015-02-25T08:11:53Z
dc.date.available2015-02-25T08:11:53Z
dc.date.issued2014-09
dc.description.abstractBACKGROUND : A common feature of most genetic sex-determination systems studied so far is that sex is determined by nonrecombining genomic regions, which can be of various sizes depending on the species. These regions have evolved independently and repeatedly across diverse groups. A number of such sex-determining regions (SDRs) have been studied in animals, plants, and fungi, but very little is known about the evolution of sexes in other eukaryotic lineages. RESULTS : We report here the sequencing and genomic analysis of the SDR of Ectocarpus, a brown alga that has been evolving independently from plants, animals, and fungi for over one giga-annum. In Ectocarpus, sex is expressed during the haploid phase of the life cycle, and both the female (U) and the male (V) sex chromosomes contain nonrecombining regions. The U and V of this species have been diverging for more than 70 mega-annum, yet gene degeneration has been modest, and the SDR is relatively small, with no evidence for evolutionary strata. These features may be explained by the occurrence of strong purifying selection during the haploid phase of the life cycle and the low level of sexual dimorphism. V is dominant over U, suggesting that femaleness may be the default state, adopted when the male haplotype is absent. CONCLUSIONS : The Ectocarpus UV system has clearly had a distinct evolutionary trajectory not only to the well-studied XY and ZW systems but also to the UV systems described so far. Nonetheless, some striking similarities exist, indicating remarkable universality of the underlying processes shaping sex chromosome evolution across distant lineages.en_ZA
dc.description.librarianhj2015en_ZA
dc.description.sponsorshipThe Centre National de la Recherche Scientifique, the Agence Nationale de la Recherche (project SEXSEAWEED), the University Pierre and Marie Curie (Emergence program), the Interreg programFrance (Channel) – England (projectMarinexus), and the Interreg IVB (project EnAlgae).en_ZA
dc.description.urihttp://www.sciencedirect.com/science/journal/09609822en_ZA
dc.identifier.citationAhmed, S, Cock, J, Pessia, E, Luthringer, R, Cormier, A, Robuchon, M, Sterck, L, Peters, AF, Dittami, SM, Corre, E, Valero, M, Aury, J-M, Roze, D, Van de Peer, Y, Bothwell, J, Marais, GAB & Coelho, SM 2014, 'A haploid system of sex determination in the brown alga Ectocarpus sp.', Current Biology, vol. 24, no. 17, pp. 1945-1957.en_ZA
dc.identifier.issn0960-9822 (print)
dc.identifier.issn1879-0445 (online)
dc.identifier.other10.1016/j.cub.2014.07.042
dc.identifier.urihttp://hdl.handle.net/2263/43815
dc.language.isoenen_ZA
dc.publisherElsevieren_ZA
dc.rights© 2014 Elsevier Ltd. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Current Biology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Current Biology, vol. 24, no. 17, pp. 1945-1957, 2014. doi : 10.1016/j.cub.2014.07.042en_ZA
dc.subjectSex-determinationen_ZA
dc.subjectSex-determining regions (SDRs)en_ZA
dc.subjectBrown Alga (Ectocarpus sp.)en_ZA
dc.subjectEctocarpus UV systemen_ZA
dc.titleA haploid system of sex determination in the brown alga Ectocarpus sp.en_ZA
dc.typePostprint Articleen_ZA

Files

Original bundle

Now showing 1 - 2 of 2
Loading...
Thumbnail Image
Name:
Ahmed_Haploid_2014.pdf
Size:
707.2 KB
Format:
Adobe Portable Document Format
Description:
Postprint Article
Loading...
Thumbnail Image
Name:
Ahmed_HaploidSuppl1_2014.pdf
Size:
2.49 MB
Format:
Adobe Portable Document Format
Description:
Supplement

License bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description: