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Title: Young Genes out of the Male: an Insight from Evolutionary Age Analysis of the Pollen Transcriptome
Authors: Cui, X.
Lv, Y.
Chen, M.
Nikoloski, Z.
Twell, David
Zhang, D.
First Published: 24-Dec-2014
Citation: Cui et al., Young Genes out of the Male: An Insight from Evolutionary Age Analysis of the Pollen Transcriptome, Molecular Plant (2015)
Abstract: The birth of new genes in genomes is an important evolutionary event. Several studies reveal that new genes in animals tend to be preferentially expressed in male reproductive tissues such as testis (Betrán et al., 2002; Begun et al., 2007; Dubruille et al., 2012), and thus an “out of the testis” hypothesis for the emergence of new genes has been proposed (Vinckenbosch et al., 2006; Kaessmann, 2010). However, such phenomena have not been examined in plant species. Here, by employing a phylostratigraphic method we dated the origin of protein coding genes in rice and Arabidopsis thaliana and observed a number of young genes in both species. These young genes tend to encode short extracellular proteins, which may be involved in rapid evolving processes, such as: reproductive barriers, species specification and anti-microbial processes. Further analysis of transcriptome age indexes across different tissues revealed that male reproductive cells express a phylogenetically younger transcriptome than other plant tissues. Compared to sporophytic tissues, the young transcriptomes of the male gametophyte displayed greater complexity and diversity, which included a higher ratio of anti-sense and inter-genic transcripts, reflecting pervasive transcription state that facilitated the emergence of new genes. Here, we propose that pollen may act as an “innovation incubator” for the birth of de novo genes. With cases of male-biased expression of young genes reported in animals, the “new genes out of the male” model revealed a common evolutionary force that drives reproductive barriers, species specification and the upgrading of defensive mechanisms against pathogens.
DOI Link: 10.1016/j.molp.2014.12.008
ISSN: 1674-2052
eISSN: 1752-9867
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Archived with reference to SHERPA/RoMEO and publisher website. This is a pre-copyedited, author-produced PDF of an article accepted for publication in Molecular Plant following peer review. The version of record Cui et al., Young Genes out of the Male: An Insight from Evolutionary Age Analysis of the Pollen Transcriptome, Molecular Plant (2015) is available online at:
Appears in Collections:Published Articles, Dept. of Biology

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