一般的なNOS1AP変異は,ロッテルダム研究でQTc間隔の延長と関連しています
Albert-Jan L H J Aarnoudse1, Christopher Newton-Cheh, Paul I W de Bakker
1Department of Epidemiology and Biostatistics, Erasmus Medical Center, PO Box 2040, 3000 CA, Rotterdam, The Netherlands.
Circulation
|June 20, 2007
まとめ
NOS1AP遺伝子の一般的な変異は,高齢者のQT間隔の長さに著しく影響を与えます. しかし,この研究では,これらの遺伝的変異と突然心臓死のリスクとの明確な関連性が見つかりませんでした.
科学分野:
- 心血管遺伝学 心血管遺伝学
- 人間の遺伝学 人間の遺伝学
- 分子心臓病学 分子心臓病学
背景:
- QT延長は突然の心臓死亡の重要な危険因子であり,遺伝性がその変動の約35%を占めています.
- 全ゲノム関連研究により,QT間隔の変動に関連する酸化窒素合成酵素1アダプタータンパク質 (NOS1AP) 遺伝子の共通変異体 (rs10494366) が特定されました.
研究 の 目的:
- 2つのNOS1AP遺伝子変異 (rs10494366とrs10918594) とQT間隔の持続時間との関連を調査する.
- これらのNOS1AP変異体と突然心臓死のリスクとの関係を評価する.
主な方法:
- この研究では,人口ベースのロッテルダム研究から55歳以上6571人の個人をゲノタイプ化しました.
- QT間隔の持続時間は,心電図 (ECG) 分析を使用して測定され,QTの持続時間と突然の心臓死との関連性は,統計モデルを使用して分析されました.
主要な成果:
- rs10494366 Gアレルは,アレルコピーの1つのQTc間隔の長さの3.8ms増加と関連していました.
- rs10918594 Gアレルは同様の関連性を示し,QTc間隔の持続時間をアレルのコピーあたり3.6ms増加させた.
- 233件の急性心疾患による死亡による11.9年間の追跡期間の中央値にもかかわらず,研究されたNOS1APの変種と急性心疾患による死亡リスクとの間に有意な関連性が見つかりませんでした.
結論:
- NOS1AP遺伝子内の一般的な変異は,高齢者集団におけるQT間隔の持続時間と強い関連性を示しています.
- これらの変種が突然の心臓死リスクに及ぼす潜在的な影響を明確に確認または反証するために,より大きなサンプルサイズが必要です.
関連する概念動画
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...
ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias
Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
Acute Coronary Syndrome III: Diagnostic Studies
Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
Dysrhythmias IV: Characteristics of Bradyarrhythmias
Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
Comparing Copy Number Variations and SNPs
Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...

