ヒトにおけるmtDNA複製数とヘテロプラズミーの核遺伝的制御
PubMedで要約を見る
まとめ
この要約は機械生成です。核ゲノム変異はミトコンドリアDNA (mtDNA) の複製数とヘテロプラズミに影響する. この研究は,mtDNAの豊富さと遺伝に対する遺伝的コントロールを明らかにし,人間の健康と老化に影響を与えています.
科学分野
- 遺伝学
- 分子生物学
- 人間の生理学
背景
- ミトコンドリアDNA (mtDNA) は細胞のエネルギー生産に不可欠であり,母性的に受け継がれます.
- 異なるmtDNA変異の共存であるヘテロプラズミーは,老化と病気に関連していますが,その遺伝的基盤は十分に理解されていません.
- mtDNAの変異に対する核ゲノムの影響については,さらなる調査が必要である.
研究 の 目的
- ヒトミトコンドリアDNAの異質性のメカニズムを調査する.
- 核ゲノムがミトコンドリアDNA複製数 (mtCN) とヘテロプラズミーに与える影響を調査する.
- mtDNAの変異とダイナミクスに関連した核の位置を特定する.
主な方法
- 274,832 個の全ゲノム配列からのmtDNA複製数とヘテロプラズミーの量化.
- mtDNA変異に関連した核の位置を特定するための全ゲノム関連研究 (GWAS).
- 年齢によるmtCNの変化を分析するために,血液細胞の構成を修正する.
主要な成果
- mtDNA複製数 (mtCN) は年齢とともに線形的に減少し,92の核ロシと関連しています.
- ほぼすべての個体には異質性mtDNAの変種があり,ソマティック単核酸変種は70歳以降に蓄積される.
- 母親から受け継がれるヘテロプラズマインデルは,mtDNAの複製と維持に関与する42の核ロキと関連したアレル特異レベルを示している.
- 特定のmtDNA長さの変種 (chrM:302) は,mtDNAの豊富さに対するシス作用の制御と,核調節遺伝子とのトランス作用の関連を示している.
結論
- 核ゲノムの一般的な変異は,mtDNA複製数とヘテロプラズミーの動態の変異を著しく形作る.
- 核遺伝子はmtDNAの複製と維持に影響を与え,特定のmtDNAアレルに選択的優位性を与える可能性があります.
- これらの発見はミトコンドリアの多様性の遺伝的構造と 人間の健康と老化への影響を洞察します
関連する概念動画
Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm—such as chloroplasts and mitochondria—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
Mitochondria are present in both plants and animal cells. They are regarded as the “powerhouses” of eukaryotic...
A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...
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%...
DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their survival. Therefore, the copying errors are checked and repaired at three levels.
Proofreading - DNA polymerase enzymes, for example, introduce 1 incorrect nucleotide...
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...

