Physicians know that their patients can react differently to the same medical treatment: for some of them, the drug will prove inefficient, whereas for others it might provoke side-effects, sometimes rather serious. Such differences in response to drug intake are due to several factors, of which molecular variations in specific genes, named " ADME " (Absorption, Distribution, Metabolism, Excretion). This project aims at investigating the evolutionary mechanisms responsible for the diversity of ADME genes in human populations. Because of their role at the interface between the organism and its chemical environment, ADME genes are likely targets of recent selective pressures linked to changes in the environments in which humans evolved, such as changes in dietary habits for instance. The aim of this project is to study the diversity of ADME genes and of their expression in five populations located along a latitudinal axis that extends from East Africa to Central Europe, passing through the Arabian Peninsula and the Mediterranean area, so as to take into account environmental factors that might have influenced the evolution of this diversity. This project is thus intended to evidence the evolutionary mechanisms that shaped genomic regions that are functionally important from the clinical and epidemiological point of view. Moreover, it will allow us to extend the knowledge of human molecular diversity and its evolution to a key-region of the peopling history of our species.
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
367
finger-tip blood drop : enzymatic activities assessed by specific single point concentration ratios after oral intake of the Geneva micrococktail made of : CYP1A2: paraxanthine/caffeine CYP2B6: 4-hydroxybupropion/bupropion CYP2C9: 4-hydroxyflurbiprofen/flurbiprofen CYP2C19: 5-hydroxyomeprazole/omeprazole CYP2D6: dextrorphan/dextromethorphan CYP3A4: 1-hydroxymidazolam/midazolam
DNA sampling from a saliva sample
Charles University in Prague/Faculty of Science/Department of Anthropology and Human Genetics
Prague, Czechia
Addis Ababa University/College of Health Sciences
Addis Ababa, Ethiopia
Democritus University of Thrace/School of Health Sciences/University Campus, Dragana
Alexandroupoli, Greece
Sultan Qaboos University/College of Medicine and Health Sciences/Department of Pharmacology
Muscat, Oman
Frequencies of genotypes and haplotypes of genes involved in drug responses (240,000 Single Nucleotide Polymorphisms) in 4 human populations : 100 Ethiopian, 100 Omani, 100 Czech and 100 Greek
Estimation of genotype/allele/haplotype frequencies of variants in genes involved in drug responses
Time frame: through study completion, an average of 2 years
Activities of 6 cytochrome P450 enzymes and P-gp in 4 human populations : 100 Ethiopian, 100 Omani, 100 Czech and 100 Greek
Estimation of frequency distributions of classes of drug metabolizers (metabolizers' profiles: slow/normal/rapid)
Time frame: through study completion, an average of 2 years
Comparison of frequency distributions of variants in genes involved in drug responses and of associated metabolizers' profiles in 4 human populations : 100 Ethiopian, 100 Omani, 100 Czech and 100 Greek
Estimation of indices of population genetic/phenotypic diversity and differentiation (expected heterozygosity, Fst). Inferences on the evolutionary mechanisms explaining the estimated diversity among and between populations.
Time frame: through study completion, an average of 3 year
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