Paternally expressed imprinted genes associate with hybridization barriers in Capsella

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F18%3A10385582" target="_blank" >RIV/00216208:11310/18:10385582 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1038/s41477-018-0161-6" target="_blank" >https://doi.org/10.1038/s41477-018-0161-6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41477-018-0161-6" target="_blank" >10.1038/s41477-018-0161-6</a>

Result language

angličtina

Original language name

Paternally expressed imprinted genes associate with hybridization barriers in Capsella

Original language description

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 &apos;effective ploidy&apos;, 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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10611 - Plant sciences, botany

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Nature Plants

ISSN

2055-026X

e-ISSN

—

Volume of the periodical

4

Issue of the periodical within the volume

6

Country of publishing house

GB - UNITED KINGDOM

Number of pages

6

Pages from-to

352-357

UT code for WoS article

000435571000015

EID of the result in the Scopus database

2-s2.0-85047801358