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Human Genetics of Tuberculosis

结核病的人类遗传学

基本信息

批准号：
10621305
负责人：
Jean-Laurent Casanova
金额：
$ 44.6万
依托单位：
WEILL MEDICAL COLL OF CORNELL UNIV
依托单位国家：
美国
项目类别：
财政年份：
2021
资助国家：
美国
起止时间：
2021-07-01 至 2026-04-30
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/10621305
关键词：
Accounting Affect African Alleles Alveolar Macrophages Biochemical Candidate Disease Gene Cell Line Cells Clinical Code Collaborations Collection Complementary DNA Computer Analysis Computing Methodologies Cytometry Data Databases Development Disease Dryness East Asian Epidemiology Ethnic Origin Etiology European Exposure to Family Fibroblasts Genes Genetic Genetic Heterogeneity Genetic Polymorphism Genetic Predisposition to Disease Genetic study Genotype HLA-DRB1 Haiti Haitian Health Hereditary Disease Human Human Genetics Immune response Immunity Immunologic Deficiency Syndromes Immunologics Immunophenotyping Impairment In Vitro Individual Infection Interferon Type II Interleukin-12 Investigation Knowledge Leukocytes Loss of Heterozygosity Macrophage Minority Minority Groups Modeling Molecular Mycobacterium tuberculosis Pathogenesis Pathway interactions Patient Recruitments Patients Penetrance Pharmacology Population Population Heterogeneity Predisposition Preventive Primary Infection Probability Production Proteins Proxy Recurrence Relapse Reporting Risk Role Sampling Siblings TNF gene TYK2 Techniques Technology Testing Therapeutic Tuberculosis Variant autosome candidate identification causal variant cell type exome sequencing experimental study genetic epidemiology genetic variant genome sequencing genome wide association study genome-wide high dimensionality immunopathology induced pluripotent stem cell interleukin-23 kindred loss of function mouse model next generation sequencing novel pathogen reactivation from latency recruit response secondary infection software development stem transcriptome sequencing whole genome

项目摘要

Project Summary Tuberculosis (TB) caused by Mycobacterium tuberculosis (Mtb) is a major health problem. About a quarter of the world population is infected, yet only a minority develop TB, either during primary infection, or later during secondary infection or reactivation of latent Mtb. Genetic epidemiological evidence strongly suggests that TB is driven by human genetic predisposition. Its molecular basis has been dissected since 2000. We discovered 2 types of inborn errors of immunity (IEI) underlying TB, both impairing interferon (IFN)-γ immunity: (i) rare IEI, such as autosomal recessive complete IL-12Rβ1 and TYK2 deficiencies, found in a few TB patients, and (ii) a common IEI due to homozygosity for the TYK2 missense P1104A variant that selectively disrupts IL-23- dependent IFN-γ immunity, accounting for up to 1% of European TB cases. These findings provided proof of principle that there are both rare and common monogenic etiologies of human TB, in specific ethnicities, and established that TYK2-dependent IFN-γ production is essential for protective immunity to Mtb. However, the vast majority of TB patients lack a genetic etiology. We hypothesize that TB is the consequence of a diverse collection of monogenic or digenic IEI, with incomplete or more rarely complete penetrance, and in a sizeable proportion of populations of diverse ancestries. To discover these variants, our project will combine a candidate gene approach focused on rare and common coding TYK2 variants with a genome-wide search for rare and common variants in other genes. TB patients will be recruited in Haiti with a specific focus on patients belonging to families with at least two TB-affected siblings, and/or with recurrent forms of TB, as these patients are more likely to carry IEI. Our project will also take advantage of our previously recruited TB patients in Haiti and worldwide (>1,500), following a strategy combining: (i) a comprehensive genetic study based on next generation sequencing (>900 samples with whole exome sequencing data already available) to search for candidate TB-causing variants using cutting-edge computational analyses under different genetic hypotheses (genetic heterogeneity or homogeneity, monogenic or digenic inheritance), and (ii) in-depth functional studies to biochemically characterize the proteins encoded by the newly discovered candidate variants, and to validate their causal role immunologically at the molecular and cellular levels. We will also test whether the effects of these IEI may be influenced by Mtb strains using a specific host-pathogen interaction study in Haitian patients. Our preliminary data indicate that this approach is fruitful, as we already identified strong candidate genotypes, including both bi-allelic loss-of-function rare variations in TYK2, TNF, BTN2A2, and PDCD1, and mono- or bi-allelic common variations in IL10RA and HLA-DRB1. Our search for rare and common variants underlying monogenic or digenic IEI that govern the development of TB with high penetrance will decipher mechanisms of protective immunity to Mtb in humans. This approach will also pave the way to new preventive or therapeutic approaches, aiming to rescue genetically deficient immune responses in patients at risk of, or with TB.

项目总结