Web of Science: 2 cites, Scopus: 2 cites, Google Scholar: cites,
Basal hsp70 expression levels do not explain adaptive variation of the warm- and cold-climate O and O gene arrangements of Drosophila subobscura
Puig Giribets, Marta (Universitat Autònoma de Barcelona. Departament de Genètica i de Microbiologia)
Santos, Mauro (Universitat Autònoma de Barcelona. Departament de Genètica i de Microbiologia)
García Guerreiro, María Pilar (Universitat Autònoma de Barcelona. Departament de Genètica i de Microbiologia)

Data: 2020
Resum: Drosophila subobscura exhibits a rich inversion polymorphism, with some adaptive inversions showing repeatable spatiotemporal patterns in frequencies related to temperature. Previous studies reported increased basal HSP70 protein levels in homokaryotypic strains for a warm-climate arrangement compared to a cold-climate one. These findings do not match the similar hsp70 genomic organization between arrangements, where gene expression levels are expected to be similar. In order to test this hypothesis and understand the molecular basis for hsp70 expression, we compared basal hsp70 mRNA levels in males and females, and analysed the 5' and 3' regulatory regions of hsp70 genes in warm- and cold-climate isochromosomal O and O lines of D. subobscura. We observed comparable mRNA levels between the two arrangements and a sex-biased hsp70 gene expression. The number of heat-shock elements (HSEs) and GAGA sites on the promoters were identical amongst the O and O lines analysed. This is also true for 3' AU-rich elements where most A and B copies of hsp70 have, respectively, two and one element in both arrangements. Beyond the regulatory elements, the only notable difference between both arrangements is the presence in 3' UTR of a 14 bp additional fragment after the stop codon in the hsp70 A copy in five O lines, which was not found in any of the six O lines. The equivalent hsp70 mRNA amounts in O and O arrangements provide the first evidence of a parallelism between gene expression and genetic organization in D. subobscura lines having these arrangements. This is reinforced by the lack of important differential features in the number and structure of regulatory elements between both arrangements, despite the genetic differentiation observed when the complete 5' and 3' regulatory regions were considered. Therefore, the basal levels of hsp70 mRNA cannot account, in principle, for the adaptive variation of the two arrangements studied. Consequently, further studies are necessary to understand the intricate molecular mechanisms of hsp70 gene regulation in D. subobscura.
Ajuts: Ministerio de Ciencia e Innovación CGL2013-42432P
Ministerio de Ciencia e Innovación CGL2017-89160P
Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1346
Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1379
Drets: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. Creative Commons
Llengua: Anglès
Document: Article ; recerca ; Versió publicada
Matèria: Drosophila subobscura ; Hsp70 expression ; Chromosomal arrangements ; Thermal adaptation
Publicat a: BMC evolutionary biology, Vol. 20 (January 2020) , art. 17, ISSN 1471-2148

DOI: 10.1186/s12862-020-1584-z
PMID: 32005133


9 p, 1.2 MB

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