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Université de Fribourg

Life-history evolution and the genetics of fitness components in drosophila melanogaster

Flatt, Thomas

In: Genetics, 2020, vol. 214, no. 1, p. 3–48

Life-history traits or “fitness components”—such as age and size at maturity, fecundity and fertility, age-specific rates of survival, and life span—are the major phenotypic determinants of Darwinian fitness. Analyzing the evolution and genetics of these phenotypic targets of selection is central to our understanding of adaptation. Due to its simple and rapid life cycle, cosmopolitan...

Université de Fribourg

Review of emerging japanese encephalitis virus: new aspects and concepts about entry into the brain and inter-cellular spreading

Filgueira, Luis ; Lannes, Nils

In: Pathogens, 2019, vol. 8, no. 3, p. 111

Japanese encephalitis virus (JEV) is an emerging flavivirus of the Asia-Pacific region. More than two billion people live in endemic or epidemic areas and are at risk of infection. Recently, the first autochthonous human case was recorded in Africa, and infected birds have been found in Europe. JEV may spread even further to other continents. The first section of this review covers...

Université de Fribourg

Wolbachia modifies thermal preference in Drosophila melanogaster

Truitt, Amy M. ; Kapun, Martin ; Kaur, Rupinder ; Miller, Wolfgang J.

In: Environmental Microbiology, 2019, vol. 21, no. 9, p. 3259–3268

Environmental variation can have profound and direct effects on fitness, fecundity, and host–symbiont interactions. Replication rates of microbes within arthropod hosts, for example, are correlated with incubation temperature but less is known about the influence of host–symbiont dynamics on environmental preference. Hence, we conducted thermal preference (Tp) assays and tested if...

Université de Fribourg

Distinct genomic signals of lifespan and life history evolution in response to postponed reproduction and larval diet in Drosophila

Hoedjes, Katja M. ; van den Heuvel, Joost ; Kapun, Martin ; Keller, Laurent ; Flatt, Thomas ; Zwaan, Bas J.

In: Evolution Letters, 2019, p. -

Reproduction and diet are two major factors controlling the physiology of aging and life history, but how they interact to affect the evolution of longevity is unknown. Moreover, although studies of large‐effect mutants suggest an important role of nutrient sensing pathways in regulating aging, the genetic basis of evolutionary changes in lifespan remains poorly understood. To address these...

Université de Fribourg

A clinal polymorphism in the insulin signaling transcription factor foxo contributes to life-history adaptation in Drosophila*

Durmaz, Esra ; Rajpurohit, Subhash ; Betancourt, Nicolas ; Fabian, Daniel K. ; Kapun, Martin ; Schmidt, Paul ; Flatt, Thomas

In: Evolution, 2019, vol. 73, no. 9, p. 1774–1792

A fundamental aim of adaptation genomics is to identify polymorphisms that underpin variation in fitness traits. In Drosophila melanogaster, latitudinal life‐history clines exist on multiple continents and make an excellent system for dissecting the genetics of adaptation. We have previously identified numerous clinal single‐nucleotide polymorphism in insulin/insulin‐like growth factor...

Université de Fribourg

Altering the temporal regulation of one transcription factor drives evolutionary trade-offs between head sensory organs

Ramaekers, Ariane ; Claeys, Annelies ; Kapun, Martin ; Mouchel-Vielh, Emmanuèle ; Potier, Delphine ; Weinberger, Simon ; Grillenzoni, Nicola ; Dardalhon-Cuménal, Delphine ; Yan, Jiekun ; Wolf, Reinhard ; Flatt, Thomas ; Buchner, Erich ; Hassan, Bassem A.

In: Developmental Cell, 2019, vol. 50, no. 6, p. 780-792.e7

Size trade-offs of visual versus olfactory organs is a pervasive feature of animal evolution. This could result from genetic or functional constraints. We demonstrate that head sensory organ size trade-offs in Drosophila are genetically encoded and arise through differential subdivision of the head primordium into visual versus non- visual fields. We discover that changes in the temporal...

Università della Svizzera italiana

Phenotype and specificity of T cells in primary human cytomegalovirus infection during pregnancy : IL-7Rpos long-term memory phenotype is associated with protection from vertical transmission

Mele, Federico ; Fornara, Chiara ; Jarrossay, David ; Furione, Milena ; Arossa, Alessia ; Spinillo, Arsenio ; Lanzavecchia, Antonio ; Gerna, Giuseppe ; Sallusto, Federica ; Lilleri, Daniele

In: Plos one, 2017, vol. 12, no. 11, p. e0187731

Congenital human cytomegalovirus (HCMV) infection is the major cause of birth defects and a precise definition of the HCMV-specific T-cell response in primary infection may help define reliable correlates of immune protection during pregnancy. In this study, a high throughput method was used to define the frequency of CD4+ and CD8+ T cells specific for four HCMV proteins in the naïve...

Université de Fribourg

Adaptation to developmental diet influences the response to selection on age at reproduction in the fruit fly

May, Christina M. ; Heuvel, Joost van den ; Doroszuk, Agnieszka ; Hoedjes, Katja M. ; Flatt, Thomas ; Zwaan, Bas J.

In: Journal of Evolutionary Biology, 2019, vol. 32, no. 5, p. 425–437

Experimental evolution (EE) is a powerful tool for addressing how environmental factors influence life‐history evolution. While in nature different selection pressures experienced across the lifespan shape life histories, EE studies typically apply selection pressures one at a time. Here, we assess the consequences of adaptation to three different developmental diets in combination with...