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© Matteo Bonazzi, Edith Gouin
Observation en immunofluorescence d'une cellule infectée par Listeria monocytogenes. En bleu: marquage des protéines de surface de Listeria qui permet de visualiser les bactéries. En rouge et vert: marquage de l'actine, une protéine qui forme le cytosquelette des cellules. Les Listeria utilisent l'actine cellulaire pour former des "comêtes" et se déplacer à l'intérieur des cellules qu'elles infectent. Cell infected by Listeria monocytogenes. The surface proteins (in blue) of Listeria enable us to view the bacteria. Actin, a constituent protein of cells, is shown in red and green.
Job

PhD candidate in biology and biophysics to apply to a PhD fellowship (10/2020-09/2023)

Scientific Fields
Diseases
Organisms
Applications
Technique
Application Deadline
01
Nov 2019
2019-11-01 8:00:00 2019-11-01 18:00:00 Europe/Paris PhD candidate in biology and biophysics to apply to a PhD fellowship (10/2020-09/2023) Application deadline: Nov 1st, 2019 PhD project: Identifying pathogenic autoantibodies in human patients using novel single cell technologies Autoimmune diseases are a major health problem, but many are difficult to study as relevant samples […] "25-28 rue du Dr. Roux, 75015, Paris" Pierre Bruhns pierre.bruhns@pasteur.fr

Application deadline: Nov 1st, 2019

PhD project: Identifying pathogenic autoantibodies in human patients using novel single cell technologies

Autoimmune diseases are a major health problem, but many are difficult to study as relevant samples are rarely available. A unique model of study consists in the different therapeutic outcomes observed in patients treated for immune thrombocytopenia (ITP), an autoimmune disease caused by antibody-mediated platelet destruction. The glycoprotein GPIIbIIIa is a frequent (>40%) target of auto-antibodies. Patients are first depleted of B cells to reduce autoantibody levels and in case of failure (50%), programmed for splenectomy, accompanied by blood sampling and bone marrow aspirates. This allows access to the three major compartments hosting antibody-secreting cells (ASC) to study their anatomical distribution and the affinity for platelet targets to understand resistance to treatment.

Questions: What is the affinity of the antibody secreted by the pathogenic ASC in different compartments from the same individual; Is there a link between the location of these ASC and the affinity of the auto-antibodies they produce? Are identical ASC clones (i.e. secreting the same exact antibody) located in different anatomical compartments?

The study of ASC on a single cell level is possible with the DropMap technology that is based on single cell encapsulation in microfluidic droplets and distribution inside an observation chamber, allowing affinity and secretion rate to be calculated for 10,000 cells at a time. It does not yet, however, allow the identification of the antibody sequence from specific ASC of interest.

Aims: 1) develop a method based on DropMap to label the droplets containing the ASC of interest, to allow their recovery and antibody sequence identification by RNA sequencing; 2) define the affinities of autoantibodies against platelets and their anatomical location; 3) sequence the highest affinity antibodies produced by ASC and study their distribution in vivo.

Goal: Develop a technology to recover and sequence cells of interest to help in the understanding (and diagnosis) of a human autoimmune disease.

Co-direction with the team of Dr Jean Baudry (ESPCI-ParisTech, 75007 Paris).

Application website: PPU International PhD program

Deadline: Nov 1st, 2019

Starting date: Oct 01, 2020.

Duration: 3 years (potentially extensible of 6 months to 1 year).

Candidate: strong background in biophysics required, highly motivated to work between the two teams. Both are international teams with english as the main working language.