Search Results for author: Aleksandra M. Walczak

Found 21 papers, 9 papers with code

Evolutionary stability of antigenically escaping viruses

1 code implementation21 Apr 2023 Victor Chardès, Andrea Mazzolini, Thierry Mora, Aleksandra M. Walczak

The immune-virus system behaves like a Fisher wave at low cross-reactivities, and like a fitness wave at high cross-reactivities.

Towards a quantitative theory of tolerance

no code implementations13 Mar 2023 Thierry Mora, Aleksandra M. Walczak

A cornerstone of the classical view of tolerance is the elimination of self-reactive T cells during negative selection in the thymus.

Decision Making

Dynamical information synergy in biochemical signaling networks

no code implementations10 Jan 2023 Lauritz Hahn, Aleksandra M. Walczak, Thierry Mora

Biological cells encode information about their environment through biochemical signaling networks that control their internal state and response.

Combining mutation and recombination statistics to infer clonal families in antibody repertoires

no code implementations22 Dec 2022 Natanael Spisak, Gabriel Athènes, Thomas Dupic, Thierry Mora, Aleksandra M. Walczak

B-cell repertoires are characterized by a diverse set of receptors of distinct specificities generated through two processes of somatic diversification: V(D)J recombination and somatic hypermutations.

From evolution to folding of repeat proteins

no code implementations24 Feb 2022 Ezequiel A. Galpern, Jacopo Marchi, Thierry Mora, Aleksandra M. Walczak, Diego U. Ferreiro

Here, we propose a scheme to map evolutionary information at the sequence level to a coarse-grained model for repeat-protein folding and use it to investigate the folding of thousands of repeat-proteins.

Protein Folding

Learning the statistics and landscape of somatic mutation-induced insertions and deletions in antibodies

no code implementations15 Dec 2021 Cosimo Lupo, Natanael Spisak, Aleksandra M. Walczak, Thierry Mora

The model includes antibody-specific maturation ages to account for variable mutational loads in the repertoire.

Affinity maturation for an optimal balance between long-term immune coverage and short-term resource constraints

no code implementations26 Jul 2021 Victor Chardès, Massimo Vergassola, Aleksandra M. Walczak, Thierry Mora

This plasticity of the repertoire drives the emergence of distinct regimes for the size and diversity of the memory pool, depending on the density of naive cells and on the mutation rate of the strain.

Specificity

MINIMALIST: Mutual INformatIon Maximization for Amortized Likelihood Inference from Sampled Trajectories

1 code implementation3 Jun 2021 Giulio Isacchini, Natanael Spisak, Armita Nourmohammad, Thierry Mora, Aleksandra M. Walczak

One class of methods uses data simulated with different parameters to infer models of the likelihood-to-evidence ratio, or equivalently the posterior function.

Time Series Time Series Analysis

Antigenic waves of virus-immune co-evolution

no code implementations20 Feb 2021 Jacopo Marchi, Michael Lässig, Aleksandra M. Walczak, Thierry Mora

Here we present a mathematical theory of co-evolution between immune systems and viruses in a finite-dimensional antigenic space, which describes the cross-reactivity of viral strains and immune systems primed by previous infections.

NoisET: Noise learning and Expansion detection of T-cell receptors

1 code implementation6 Feb 2021 Meriem Bensouda Koraichi, Maximilian Puelma Touzel, Andrea Mazzolini, Thierry Mora, Aleksandra M. Walczak

High-throughput sequencing of T- and B-cell receptors makes it possible to track immune repertoires across time, in different tissues, in acute and chronic diseases and in healthy individuals.

Learning the heterogeneous hypermutation landscape of immunoglobulins from high-throughput repertoire data

1 code implementation23 Jul 2020 Natanael Spisak, Aleksandra M. Walczak, Thierry Mora

Somatic hypermutations of immunoglobulin (Ig) genes occuring during affinity maturation drive B-cell receptors' ability to evolve strong binding to their antigenic targets.

Immune Fingerprinting through Repertoire Similarity

no code implementations24 Jun 2020 Thomas Dupic, Meriem Bensouda Koraichi, Anastasia Minervina, Mikhail Pogorelyy, Thierry Mora, Aleksandra M. Walczak

Immune repertoires provide a unique fingerprint reflecting the immune history of individuals, with potential applications in precision medicine.

SOS: Online probability estimation and generation of T and B cell receptors

no code implementations29 Mar 2020 Giulio Isacchini, Carlos Olivares, Armita Nourmohammad, Aleksandra M. Walczak, Thierry Mora

Recent advances in modelling VDJ recombination and subsequent selection of T and B cell receptors provide useful tools to analyze and compare immune repertoires across time, individuals, and tissues.

Inferring the immune response from repertoire sequencing

1 code implementation17 Dec 2019 Maximilian Puelma Touzel, Aleksandra M. Walczak, Thierry Mora

High-throughput sequencing of B- and T-cell receptors makes it possible to track immune repertoires across time, in different tissues, and in acute and chronic diseases or in healthy individuals.

Quantitative Methods

On generative models of T-cell receptor sequences

1 code implementation27 Nov 2019 Giulio Isacchini, Zachary Sethna, Yuval Elhanati, Armita Nourmohammad, Aleksandra M. Walczak, Thierry Mora

T-cell receptors (TCR) are key proteins of the adaptive immune system, generated randomly in each individual, whose diversity underlies our ability to recognize infections and malignancies.

Quantitative Methods

Quantitative Immunology for Physicists

no code implementations8 Jul 2019 Grégoire Altan-Bonnet, Thierry Mora, Aleksandra M. Walczak

The adaptive immune system is a dynamical, self-organized multiscale system that protects vertebrates from both pathogens and internal irregularities, such as tumours.

Inferring processes underlying B-cell repertoire diversity

no code implementations10 Feb 2015 Yuval Elhanati, Zachary Sethna, Quentin Marcou, Curtis G. Callan Jr., Thierry Mora, Aleksandra M. Walczak

We quantify the VDJ recombination and somatic hypermutation processes in human B-cells using probabilistic inference methods on high-throughput DNA sequence repertoires of human B-cell receptor heavy chains.

Populations and Evolution Genomics

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