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Mating type specific transcriptomic response to sex inducing pheromone in the pennate diatom Seminavis robusta
Bilcke, G.; Van den Berge, K.; Bonneure, E.; Poulsen, N.; Bulankova, P.; Osuna-Cruz, C.M.; Dickenson, J.; Sabbe, K.; Pohnert, G.; Vandepoele, K.; Mangelinckx, S.; Clement, L.; De Veylder, L.; Vyverman, W. (2021). Mating type specific transcriptomic response to sex inducing pheromone in the pennate diatom Seminavis robusta. ISME J. 15(2): 562-576. https://dx.doi.org/10.1038/s41396-020-00797-7
In: The ISME Journal: Multidisciplinary Journal of Microbial Ecology. Nature Publishing Group: London. ISSN 1751-7362; e-ISSN 1751-7370, more
Peer reviewed article  
Available in  Authors 
Keywords
    Seminavis robusta D.B.Danielidis & D.G.Mann, 2002 [WoRMS]
    Marine/Coastal
Authors  Top 
  • Bilcke, G., more
  • Van den Berge, K., more
  • Bonneure, E., more
  • Poulsen, N.
  • Bulankova, P., more
  • Osuna-Cruz, C.M., more
  • Dickenson, J.
  • Sabbe, K., more
  • Pohnert, G.
  • Vandepoele, K., more
Abstract
    Sexual reproduction is a fundamental phase in the life cycle of most diatoms. Despite its role as a source of genetic variation, it is rarely reported in natural circumstances and its molecular foundations remain largely unknown. Here, we integrate independent transcriptomic datasets to prioritize genes responding to sex inducing pheromones (SIPs) in the pennate diatom Seminavis robusta. We observe marked gene expression changes associated with SIP treatment in both mating types, including an inhibition of S phase progression, chloroplast division, mitosis, and cell wall formation. Meanwhile, meiotic genes are upregulated in response to SIP, including a sexually induced diatom specific cyclin. Our data further suggest an important role for reactive oxygen species, energy metabolism, and cGMP signaling during the early stages of sexual reproduction. In addition, we identify several genes with a mating type specific response to SIP, and link their expression pattern with physiological specialization, such as the production of the attraction pheromone diproline in mating type − (MT−) and mate-searching behavior in mating type + (MT+). Combined, our results provide a model for early sexual reproduction in pennate diatoms and significantly expand the suite of target genes to detect sexual reproduction events in natural diatom populations.
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