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Reverse transcriptase-mediated expansion of the host innate immune system

逆转录酶介导的宿主先天免疫系统扩张

基本信息

批准号：
10574416
负责人：
Richard Noel McLaughlin
金额：
$ 23万
依托单位：
PACIFIC NORTHWEST RESEARCH INSTITUTE
依托单位国家：
美国
项目类别：
财政年份：
2022
资助国家：
美国
起止时间：
2022-12-12 至 2024-11-30
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10574416
关键词：
APOCEC3G gene Alleles Animals Antiviral Response Back Binding Biochemistry Biological Assay Birth Cebidae Cells Communicable Diseases Computational Biology Data Dependence Dimerization Disease Outcome Disease susceptibility Disparate Dominant-Negative Mutation EEF1A1 gene Elongation Factor Exons Expression Profiling Family Frequencies Gene Duplication Gene Family Genes Genetic Determinism Genetic Polymorphism Genetic Transcription Genome Haploidy Haplotypes Heritability Human Human Genome Immune Immune response Immunity In Vitro Individual Innate Immune System Interferons Invaded Knock-out Link Location Maps Measures Mediating Messenger RNA Mutation Natural Immunity Outcome Peptide Fragments Peptides Phase Pongidae Population Predisposition Primates Process Proteins Pseudogenes Publishing RNA Viruses RNA-Directed DNA Polymerase Recording of previous events Research Resistance Retroviridae Retroviridae Infections Reverse Transcription Role Shapes Signal Transduction Source Technology Testing Tissues Translating Translations Variant Viral Viral Genes Viral Physiology Virus Virus Diseases Virus Replication cell type cofactor dimer gene interaction genome analysis high throughput screening human reference genome immune system function individual variation inhibitor innate immune function insertion/deletion mutation pathogen promoter prospective transcription factor virology

项目摘要

PROJECT SUMMARY Large effect mutations in innate immunity genes can have dramatic effects on infectious disease susceptibility and outcome. In addition, the genetic determinants of more subtle and widespread variation in an individual’s susceptibility and immune response to viral infections has been studied in the context of mutations in the many known innate immunity genes. We propose that there are new polymorphic innate immune genes created by retroviruses (so called ‘retrocopies’) in the genome of many individuals which are typically overlooked, and which have the capacity to modulate an individual’s immune response. Thousands of young and old retrocopies are present in each human genome and their number and sequences differ among individuals in a population. Until now, old retrocopies have largely been ignored as pseudogenes, while young retrocopies have been understudied due to technical challenges of accurate identification inherent in the most common sequencing technologies. A pioneering study in our lab showed that human and other primate genomes contain retrocopies of the APOBEC3 family of viral restriction factors that are transcribed and capable of restricting virus replication in vitro. Our more recent preliminary data revealed extensive retrocopying of additional antiviral gene families within humans and other primate species, suggesting the recent retrocopying of viral restriction and host dependency factors may be widespread. Further, some of these retrocopies are very young – present in only some humans – and could represent an unappreciated source of individual variation in susceptibility or resistance to viral infection. With a combination of computational biology, in vitro virology and biochemistry, and high throughput functional assays, we will identify young retrocopies of virus-interacting genes that are present in only some humans and test these new genes’ ability to enhance or impede the innate immune system’s antiviral response. To test our hypothesis that retrocopy expansions modify immune system function, we will: (1) Identify young, polymorphic retrocopies of host dependency and restriction factor genes in humans. (2) Characterize transcription and antiviral functions of polymorphic host dependency and restriction factor retrocopies, either as restriction factors or dependency factors that evade viral co-option. (3) Identify retrocopies that act as dominant negative inhibitors of their parental antiviral genes thereby inhibiting the innate immune system and promoting viral replication. This research will discover new innate immune genes and found a new direction in understanding the genetic determinants of an individual's susceptibility and immune response to virus infection.

项目总结