Past Seminars

Here is the list of our past seminars:


Armita Nourmohammad (Princeton University). Biophysics Seminar ESPCI-ENS.

Friday 7 October 2016 from 13:00 to 14:00 - ESPCI, Amphi Urbain, Ground Floor, Staircase N

Statistical Physics of molecular evolution: from gene regulation to immune system.

Molecular phenotypes, such as gene expression or protein binding affinities are important targets of natural selection, and are often subject to time-dependent pressure form the environment. However, the map between encoding DNA sequences and molecular phenotypes is often too difficult to quantify. In this talk, I will show that universality is an emerging property of complex phenotypes, which are encoded by multiple genomic loci. I will introduce a non-equilibrium framework for adaptive dynamics of such phenotypes in time-dependent environments, and between co-evolving populations. In time-dependent environments, changes in the environment drive the evolution of the species, but not vice versa. As an example, I will present strong evidence that adaptation dominates the evolution of gene expression levels in Drosophila. Co-evolving populations reciprocally affect the fitness of each other, acting as time-dependent environments with feedback. As an example, I will show evidence of co-adaptation between interacting cellular populations of HIV viruses and the antibody repertoire of a patient over the course of an infection. In particular, I discuss the conditions for emergence of broadly neutralizing antibodies, which are recognized as critical for designing an effective vaccine against HIV.






Recent seminars  (0)


Armita Nourmohammad (Princeton University). Biophysics Seminar ESPCI-ENS.

Friday 7 October 2016 from 13:00 to 14:00 - ESPCI, Amphi Urbain, Ground Floor, Staircase N

Statistical Physics of molecular evolution: from gene regulation to immune system.

Molecular phenotypes, such as gene expression or protein binding affinities are important targets of natural selection, and are often subject to time-dependent pressure form the environment. However, the map between encoding DNA sequences and molecular phenotypes is often too difficult to quantify. In this talk, I will show that universality is an emerging property of complex phenotypes, which are encoded by multiple genomic loci. I will introduce a non-equilibrium framework for adaptive dynamics of such phenotypes in time-dependent environments, and between co-evolving populations. In time-dependent environments, changes in the environment drive the evolution of the species, but not vice versa. As an example, I will present strong evidence that adaptation dominates the evolution of gene expression levels in Drosophila. Co-evolving populations reciprocally affect the fitness of each other, acting as time-dependent environments with feedback. As an example, I will show evidence of co-adaptation between interacting cellular populations of HIV viruses and the antibody repertoire of a patient over the course of an infection. In particular, I discuss the conditions for emergence of broadly neutralizing antibodies, which are recognized as critical for designing an effective vaccine against HIV.






Seminar archive  (219)


Top



See also...

Unregister our newsletter

Gravida potentié lobortïs odio pharetra diam dui nullä leçtus fames malesuada pésuéré, ut quam egestas égét à nunc mi ïpsum pulvinar mauris id, vel (...) 

> More...

Register our newsletter

Justo grâvida vel facîlisis çurcus porta non dapidûs c’est dictumst sét vel pulvîar vulputate orci sét litoré, aliquet classé lacus facîlisis pérès £at (...) 

> More...