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Strong Maternal Effects on Gene Expression inArabidopsis lyrata Hybrids
Molecular Ecology and Evolution Lab, Department of Biology, Lund University, Lund, Sweden.
Plant Ecology and Evolution, Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Biologi. Linköpings universitet, Tekniska fakulteten. Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University.
Plant Ecology and Evolution, Department of Ecology and Genetics, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden.
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2016 (Engelska)Ingår i: Molecular Biology and Evolution, ISSN 0737-4038, Vol. 33, nr 4, s. 984-994Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Hybridization between populations or species can have pronounced fitness consequences. Yet little is known about howhybridization affects gene regulation. Three main models have been put forward to explain gene expression patterns inhybrids: additive, dominance, or parental effects. Here, we use high throughput RNA-sequencing to examine the extent towhich hybrid gene expression follows predictions by each of the three models. We performed a reciprocal crossingexperiment between two differentiated populations of the perennial herb Arabidopsis lyrata and sequenced RNA inrosette leaves of 12-week-old plants grown in greenhouse conditions. The two parental populations had highly differentiatedgene expression patterns. In hybrids, a majority of genes showed intermediate expression relative to that of theirparental populations (i.e., additive effects), but expression was frequently more similar to the maternal than to theirpaternal population (i.e., maternal effects). Allele-specific expression analyses showed that in the vast majority of cases,genes with pronounced maternal effect expressed both the maternal and the paternal allele. Maternal effects on hybridgene expression have rarely been documented previously and our study suggests it could be more common thanpreviously assumed. Whether the maternal effect on gene expression persists to later life-stages, and whether thevariation in gene expression is manifested in other aspects of the phenotype, remain to be elucidated. Our findingsare relevant for understanding the consequences of outbreeding and hybridization and open up several questions forfuture studies.

Ort, förlag, år, upplaga, sidor
Oxford University Press, 2016. Vol. 33, nr 4, s. 984-994
Nyckelord [en]
hybridization, gene expression, maternal effect, additive effect, Arabidopsis lyrata, RNA-Seq
Nationell ämneskategori
Genetik
Identifikatorer
URN: urn:nbn:se:liu:diva-125904DOI: 10.1093/molbev/msv342ISI: 000374226700011PubMedID: 26685177OAI: oai:DiVA.org:liu-125904DiVA, id: diva2:909598
Tillgänglig från: 2016-03-07 Skapad: 2016-03-07 Senast uppdaterad: 2017-03-17

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