We are interested in how genotypic variability impacts molecular phenotypes and how, together with the environment, this affects complex human traits and disease susceptibility. Our focal molecular phenotype involves the concentration of small molecules underlying metabolism. These concentrations can be measured on large-scale, in body fluids, like blood and urine. In our recent article “Genome-wide association study of metabolic traits reveals novel gene-metabolite-disease links” that appeared in PLoS Genetics on 20 February 2013, we studied such data derived from the CoLaus. Below is more information on this publication and details on the our method can be found here. Our article features as News of the University of Lausanne (here), the University Hospital -CHUV (here) and the Swiss Institute of Bioinformatics (here).
The group has become member of the Swiss Institute of Bioinformatics (SIB) after the voting of the SIB Foundation Council on 26 June. Further details are here.
In April 2013 Zoltán Kutalik was nominated as Assistant Professor of the Faculty of Biology and Medicine of the University of Lausanne. He will be working in the Statistics Unit of the Institute of Social and Preventive Medicine (IUMSP) of the Lausanne University Hospital (CHUV).
The team of Pierre-Yves Bochud (CHUV-UNIL), Zoltán Kutalik (UNIL-SIB), Oscar Marchetti (CHUV-UNIL) and Christian van Delden (HUG & UNIGE) received the Leenaards Prize 2013 for their project “Host genome and transcriptome: new diagnostic and treatment strategies for fungal infections“.
There are many known examples of the allelic heterogeneity and imperfect tagging phenomena. The former one is of great importance in monogenic traits but has not yet been systematically investigated and quantified in complex-trait genome-wide association studies (GWASs). We devised a multi-SNP association method that estimates the effect of loci harboring multiple association signals by using GWAS summary statistics.
Only a fraction of patients with chronic HCV infection develop liver fibrosis, a process that might also be affected by genetic factors. We studied well-characterized HCV-infected patients of European descent who underwent liver biopsies before treatment.
The HYPERGENES Project investigated associations between genetic variants and essential hypertension pursuing a 2-stage study by recruiting cases and controls from extensively characterized cohorts recruited over many years in different European regions. Continue reading
|Underweight and obese phenotypes can both pose health risks. But whereas obesity has been associated with a number of genetic variants, little is known about the genetic basis of underweight. A large-scale screen of data from 28 cytogenetic centres in Europe and North America now shows that being underweight is frequently associated with duplication of a short region on chromosome 16. Continue reading|
Genome-wide association studies (GWAS) are conducted with the promise to discover novel genetic variants associated with diverse traits. For most traits, associated markers individually explain just a modest fraction of the phenotypic variation, but their number can well be in the hundreds. We developed a maximum likelihood method that allows us to infer the distribution of associated variants even when many of them were missed by chance.
Via the CoLaus and Hypergenes cohorts our group contributed to the meta-analysis of the GIANT consortium that revealed hundreds of genetic variants associated with human height; 18 new loci for body mass index; and 13 new loci for waist-hip-ratio.