2015-2019: Ph.D. position on “Extraocular photoreception and bioluminescence of two luminous shark families, Etmopteridae and Dalatiidae” (FRIA grant FRS-FNRS)
2013-2015: Master in “Organism Biology and Ecology” (UCLouvain)
2010-2013: Bachelor in “Biology” (UCLouvain)
Link between photoemission and photoperception in luminous shark
Although bioluminescence has been studied extensively in bone fish, it is also present in cartilaginous fish where there are currently more than 50 species of luminous sharks, belonging to the families of Dalatiidae and Etmopteridae. Until recently, the majority of studies were based on simple observations, sometimes unique, light organs (photophores) or in vivo light production, this being mainly due to the difficulty of obtaining specimens. Recently, the marine biology laboratory initiated the study of bioluminescence in various shark species. A multidisciplinary study was conducted in a species of lanternshark, Etmopterus spinax (L., 1758). Thus, the luminous pattern, the morphology of the photophores, the control of light emission or the role of this adaptation have been investigated in this species. Since 2015, my doctorate is underway, aiming to decipher the link between extraocular photoreception (through an extraocular opsin) and light emission. How this species manages to perceive its own light to finely regulate bioluminescence in a counterillumination purpose (camouflage)? This work is extended to other shark species belonging to both luminous shark families.
Duchatelet L., Delroisse J., Flammang P., Mahillon J., Mallefet J. 2019. Etmopterus spinax,the velvet belly lanternshark, does not use bacterial luminescence. Acta Histochemica.
Duchatelet L., Pinte N., Tomita T., Sato K., Mallefet J. 2019. Etmopteridae bioluminescence: dorsal pattern specificity and aposematic use. Zoological letters.
Delroisse J., Duchatelet L., Flammang P., Mallefet J. 2018. De novo transcriptome analyses provide insights into opsin-based photoreception in the lanternshark, Etmopterus spinax. PloS One.
Duchatelet L., Claes J. M., Mallefet J. 2019. Embryonic expression of encephalopsin supports bioluminescence perception in lanternshark photophores. Marine Biology.
Oury N., Duchatelet L., Mallefet J., Magalon H. 2019. Isolation and characterization of 29 and 19 microsatellite loci from two deep-sea luminous lanternsharks, Etmopterus spinax and Etmopterus molleri (Squaliformes, Etmopteridae). Molecular Biology Reports.
Etmopterus spinax (© J. Mallefet)