9p21 冠動脈疾患に関連するDNA変異は,インターフェロン-γシグナル伝達応答を損なう
Olivier Harismendy1, Dimple Notani, Xiaoyuan Song
1Department of Pediatrics and Rady's Children's Hospital, University of California at San Diego, School of Medicine, La Jolla, California 92093, USA.
Nature
|February 11, 2011
まとめ
9p21領域の遺伝子変異は,冠動脈疾患 (CAD) と2型糖尿病に関連しています. この研究では,9p21の増強剤を特定し,リスクアレルがSTAT1結合を妨害し,炎症への反応として遺伝子発現に影響を与える方法を明らかにしました.
科学分野:
- ゲノミクスゲノミクスとは
- 分子生物学は分子生物学である.
- 心血管遺伝学 心血管遺伝学
背景:
- 全ゲノム関連性研究 (GWAS) は,9p21遺伝子砂漠の単一核酸多形態 (SNP) を冠動脈疾患 (CAD) と2型糖尿病と関連付けています.
- これらの遺伝的関連の背後にある正確な生物学的メカニズムは,関連するゲノム領域の規制的役割の証拠にもかかわらず,ほとんど説明されていないままです.
研究 の 目的:
- 9p21の場所内の規制要素を特定し,特徴づけること.
- CADに関連したSNPが遺伝子調節と細胞応答に与える機能的影響を明らかにする.
- 長期的なゲノム相互作用と,疾患の感受性におけるその役割を調査する.
主な方法:
- 9p21場所における強化剤の識別と特徴付け.
- STAT1結合の分析と,リンパ芽細胞細胞系におけるCDKN2BAS発現に対するその影響.
- 人間の血管内皮細胞における長距離クロマチンの相互作用を検出するための新しいアプローチを使用.
- インターフェロン-γの活性化が9p21場所内のクロマチンの構造と遺伝子発現に与える影響を調査.
主要な成果:
- 9p21の位置は,予測された増強剤に例外的に豊かであり,全ゲノムよりも大幅に多く含まれています.
- rs10811656とrs10757278のCADリスクアレルは,強化剤内のSTAT1結合部位を破壊する.
- STAT1結合はCDKN2BAS発現を否定的に調節し,CADリスクアレルによって影響されるプロセスである.
- 強化器領域は,CDKN2A/BおよびMTAP遺伝子と物理的に相互作用し,IFNA21のダウンストリームのインターバルと相互作用する.
- インターフェロン-γの活性化により,血管内皮細胞の9p21場所におけるクロマチンの構造,STAT1結合,増強剤の相互作用,および遺伝子発現が深刻に変化します.
結論:
- 9p21の局所には,隣接する遺伝子を調節する上で重要な役割を果たす多数の増強剤が含まれています.
- CADに対する遺伝的感受性は,STAT1媒介の遺伝子調節の障害を通じた血管細胞の炎症反応経路と関連しています.
- GWASの発見は,新しいゲノム領域や病気の病因学に関連する生物学的メカニズムに関する研究を効果的に導くことができます.
関連する概念動画
Pharmacogenomics: Identification of New Drug Targets
Advances in genomics have profoundly influenced drug discovery by increasing both the speed and accuracy of pharmaceutical development. Pharmacogenomics, which examines how genetic variation influences drug response, facilitates the identification of novel therapeutic targets and enables patient stratification for personalized treatment. These strategies contribute to improved drug efficacy, minimized adverse effects, and more efficient clinical trial design.Mapping genetic differences...
Single Nucleotide Polymorphisms-SNPs
A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu
Genetic variations significantly influence drug response through pharmacokinetics, receptor interactions, and biologic milieu modifications. Pharmacokinetic alterations impact drug metabolism and clearance, affecting efficacy and toxicity. Variants in drug-metabolizing enzymes, such as CYP2C9 and CYP2C19, alter drug activation and elimination. For example, CYP2C9 loss-of-function variants require lower warfarin doses to prevent excessive bleeding, while CYP2C19 variants reduce clopidogrel...
Principles of Pharmacogenetics: Types of Genetic Variants
The human genome is over 99.9% identical between individuals, yet genetic differences exist at millions of bases. The human genome contains approximately 3 million variant positions per individual, many of which are heterozygous, contributing to genetic diversity and individual traits. Genetic variations include single-nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations (CNVs).SNPs, the most common variation, involve single-base changes in DNA. These can be...
Genome-wide Association Studies-GWAS
Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...
GWAS does not require the identification of the target gene involved in...
Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase
Genetic polymorphisms in drug targets have emerged as critical determinants of interindividual variability in drug response and toxicity. Pharmacogenomic investigations increasingly focus on identifying these variations to personalize and optimize therapeutic interventions. A drug target may be a receptor, enzyme, or signaling protein involved in pharmacologic responses or disease-related pathways. While early pharmacogenetic studies focused primarily on drug metabolism, current research...

