Universität zu Köln

Lafon-Placette, Clement ORCID: 0000-0001-6634-8104, Hatorangan, Marcelinus R., Steige, Kim A., Cornille, Amandine ORCID: 0000-0002-5348-7081, Lascoux, Martin ORCID: 0000-0003-1699-9042, Slotte, Tanja ORCID: 0000-0001-6020-5102 and Kohler, Claudia ORCID: 0000-0002-2619-4857 (2018). Paternally expressed imprinted genes associate with hybridization barriers in Capsella. Nat. Plants, 4 (6). S. 352 - 360. LONDON: NATURE PUBLISHING GROUP. ISSN 2055-0278

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Abstract

Hybrid seed lethality is a widespread type of reproductive barrier among angiosperm taxa(1,2) that contributes to species divergence by preventing gene flow between natural populations(3,4). Besides its ecological importance, it is an important obstacle to plant breeding strategies(5). Hybrid seed lethality is mostly due to a failure of the nourishing endosperm tissue, resulting in embryo arrest(3,6,7). The cause of this failure is a parental dosage imbalance in the endosperm that can be a consequence of either differences in parental ploidy levels or differences in the 'effective ploidy', also known as the endosperm balance number (EBN)(8,9). Hybrid seed defects exhibit a parent-of-origin pattern(3,6,7), suggesting that differences in number or expression strength of parent-of-origin-specific imprinted genes underpin, as the primary or the secondary cause, the molecular basis of the EBN7,10. Here, we have tested this concept in the genus Capsella and show that the effective ploidy of three Capsella species correlates with the number and expression level of paternally expressed genes (PEGs). Importantly, the number of PEGs and the effective ploidy decrease with the selfing history of a species: the obligate outbreeder Capsella grandiflora had the highest effective ploidy, followed by the recent selfer Capsella rubella and the ancient selfer Capsella orientalis. PEGs were associated with the presence of transposable elements and their silencing mark, DNA methylation in CHH context (where H denotes any base except C). This suggests that transposable elements have driven the imprintome divergence between Capsella species. Together, we propose that variation in transposable element insertions, the resulting differences in PEG number and divergence in their expression level form one component of the effective ploidy variation between species of different breeding system histories, and, as a consequence, allow the establishment of endosperm-based hybridization barriers.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lafon-Placette, Clement UNSPECIFIED orcid.org/0000-0001-6634-8104 UNSPECIFIED Hatorangan, Marcelinus R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Steige, Kim A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cornille, Amandine UNSPECIFIED orcid.org/0000-0002-5348-7081 UNSPECIFIED Lascoux, Martin UNSPECIFIED orcid.org/0000-0003-1699-9042 UNSPECIFIED Slotte, Tanja UNSPECIFIED orcid.org/0000-0001-6020-5102 UNSPECIFIED Kohler, Claudia UNSPECIFIED orcid.org/0000-0002-2619-4857 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-183655
DOI:	10.1038/s41477-018-0161-6
Journal or Publication Title:	Nat. Plants
Volume:	4
Number:	6
Page Range:	S. 352 - 360
Date:	2018
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	2055-0278
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ARABIDOPSIS-LYRATA; EVOLUTION; BRASSICACEAE; MECHANISMS; PLANTS Multiple languages Plant Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/18365