Yeast as a model for understanding gene expression adaptation

酵母作为理解基因表达适应的模型

• 批准号: 9530658
• 负责人: Hunter B Fraser
• 金额: $ 31.38万
• 依托单位: STANFORD UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-02-05 至 2020-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9530658
• 关键词: Acquired Immunodeficiency Syndrome; Address; Affect; Alleles; Amaze; Amino Acid Sequence; Amphotericin B; Anabolism; Antifungal Agents; Behavior; Biology; CRISPR/Cas technology; Candidate Disease Gene; Cell Proliferation; Chromosome Mapping; Clustered Regularly Interspaced Short Palindromic Repeats; Code; Collection; Data; Data Set; Demography; Down-Regulation; Drug resistance; Emerging Communicable Diseases; Environment; Enzymes; Ergosterol; Evolution; Future; Gene Expression; Genes; Genetic; Genetic Drift; Genome Scan; Genotype; Goals; Health; House mice; Human; Hybrids; Immune; Individual; Investigation; Lead; Life; Loss of Heterozygosity; Measures; Methods; Mitotic Recombination; Modeling; Molecular; Mutation; Natural Selections; Pathogenicity; Pathway interactions; Patients; Pattern; Phenotype; Population; Process; Proteins; Quantitative Trait Loci; Regulatory Element; Repression; Resistance; Role; Shapes; Site; Specific qualifier value; Testing; Toxin; UV response; Up-Regulation; Variant; Work; Yeasts; base; fitness; follow-up; gene discovery; genetic variant; genome-wide; innovation; pathogen; precise genome editing; promoter; protein complex; protein expression; rapid technique; species difference; tool; trait; transcription factor

Project Summary Adaptation via natural selection is the process by which the incredible fit between every species and its environment has evolved. Despite its importance, we still have little understanding of which genetic variants have been adaptive in any species, and how these variants act at the molecular level. One classic question is whether most adaptations involve changes in protein sequences, or in cis- regulatory elements; another fundamental question is whether adaptations typically involve single mutations of large effect, or many mutations of small effect. Historically, most studies pinpointing the genetic basis of polymorphic traits have focused on protein sequence changes of large effect, because these have been the simplest to identify. However recent work has suggested that polygenic cis-regulatory adaptations may actually be far more common. Unfortunately these have traditionally been almost impossible to identify, due to the very small individual effect of each variant on the selected trait. Over the past five years, we have developed a method to find these polygenic adaptations from genome-wide data, based on the idea of a “sign test”. The goal is to identify cases where selection has led to up- or down-regulation of multiple genes via independent mutations. Using this test in yeast, we have identified gene expression adaptations involving toxin resistance, ergosterol biosynthesis, and pathogenicity. Overall, our applications of the sign test have identified several hundred genes involved in cis-regulatory adaptations, including the first examples of gene expression adaptation occurring at the level of pathways and protein complexes; the first known cases of regulatory adaptations affecting behavior and pathogenicity; and the first examples of polygenic gene expression adaptations of any kind in house mice and humans. In this project we have two major goals. First, we will develop computational and experimental tools based on CRISPR/Cas9 technology that will make characterizing cis-regulatory variants far more practical in a wide range of species. Second, we will develop methods for high-throughput mapping of genes contributing to divergence in fitness, the key phenotype for natural selection. This project will also lay the groundwork for future investigations into facets of gene expression evolution important to human health, such as how gene expression evolves in both humans and their pathogens.

项目总结