从聚合的染色质可访问性数据中推断基因型推断揭示了遗传调节机制
Brandon M Wenz1, Yuan He2, Nae-Chyun Chen3
1Genetics and Epigenetics Program, Cell and Molecular Biology Graduate Group, Biomedical Graduate Studies, University of Pennsylvania-Perelman School of Medicine, Philadelphia, PA, 19104, USA.
Genome biology
|March 30, 2025
概括
本研究引入了从多样化,以前未经类型化样本中进行的大规模染色体可访问性定量特征位点 (caQTL) 分析. 它揭示了caQTLs丰富了调控元素,并调解了基因表达的遗传效应,从而推进了对复杂特征的理解.
科学领域:
- 基因组学就是基因组学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 系统生物学 系统生物学
背景情况:
- 遗传变异通过改变色素可访问性来影响复杂的特征.
- 大量的ATAC-seq数据集存在,但往往缺乏配对的遗传信息.
- 整合不同的样本对于理解染色体可访问性变异性至关重要.
研究的目的:
- 在多样化,非类型化样本上开发和演示大规模的染色体可访问性定量特征位点 (caQTL) 分析.
- 编目caQTL并识别特定上下文的监管元素.
- 阐明caQTLs在调解基因表达上的遗传影响中的作用.
主要方法:
- 联合基因型化和ATAC-seq峰值要求从1454个人中抽取10,293个样本.
- 发现了染色体可访问性定量特征位点 (caQTLs).
- 基于染色体可访问性概况进行样本聚类,用于特定环境的分析.
主要成果:
- 在没有先前的基因型数据的情况下,在多样化的样本集中编目了24,159个caQTL.
- 在基因调节元件中证明了caQTLs的强烈丰富.
- 显示的caQTLs将遗传变异与基因表达变化 (eQTLs) 和人类特征联系起来.
结论:
- 在以前未经定型的样本中建立了caQTL分析的原理证明.
- 创建了最大和最多样化的caQTL资源之一.
- 提供了对基因表达和疾病机制的遗传调节的见解.
相关概念视频
02:32Histone Modification
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
02:25Spreading of Chromatin Modifications
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer is an enzyme that can...
Writers
The writer is an enzyme that can...
03:17Inheritance of Chromatin Structures
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...
02:35Chromatin Position Affects Gene Expression
Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area.
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the timing and level of...
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the timing and level of...
02:36Chromatin Immunoprecipitation- ChIP
Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
02:38Heterochromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...