Description du projet
Cartographier des réseaux de gènes au niveau de la cellule individuelle
Le séquençage de l’ARN à l’échelle de la cellule (scRNA-seq) est une technologie novatrice qui permet d’étudier le transcriptome de cellules individuelles. Bien que le scRNA-seq ait permis de mieux comprendre les réseaux de gènes, il ne tient pas compte des contraintes biophysiques potentielles. Le projet scNet, financé par l’UE, entend développer un algorithme d’inférence capable de prédire l’impact des perturbations dues à la suppression de facteurs de transcription. Les résultats du projet amélioreront notre connaissance des voies de régulation dans les cellules et nous éclaireront sur la manière dont différentes molécules interagissent entre elles. Plus important encore, scNet contribuera à cartographier les réseaux de communication entre les gènes au niveau de la cellule individuelle, ce qui s’est avéré impossible jusqu’à récemment en raison de limitations méthodologiques.
Objectif
Regulatory processes within living cells have long been the topic of research interest and the key to understanding various diseases. The decades of studies resulted in a large body of knowledge on molecular interactions and regulatory pathways in the cells of model organisms ranging from microorganisms to mammals. Nevertheless, accurately inferring gene network topology at the scale of a whole cell has remained an intractable task until recently, mostly due to the large amount of single-cell data needed for such inference. In the last few years, single-cell RNA sequencing (scRNA-seq) technology enabled measuring transcriptome of high numbers of individual cells, which allowed observing a much grater share of the multidimensional parameter space of large gene networks and gave rise to multiple inference methods. However, none of the existing methods incorporates all relevant knowledge on biophysical constraints. This project aims to incorporate prior knowledge on the system; decomposition of measurement, extrinsic and intrinsic noise; and accurate representation of stochastic gene expression and its regulation into a Bayesian inference framework for identifying topology of a gene network and rate constants of its molecular interactions. The performance of the inference algorithm will be tested by evaluating its ability to predict the effects of transcription factor deletion perturbations. Enhancing gene network inference by accounting for the wealth of known biophysical constraints could provide insights into the gene regulatory processes that would enable advancement in developmental and evolutionary biology, biomedicine and bioengineering.
Champ scientifique
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Régime de financement
MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)Coordinateur
64289 Darmstadt
Allemagne