まとめ
この研究は,ヒトアルファ-グロービン擬似遺伝子 (psi alpha 1) の核酸配列を提示しています. 偽遺伝子には,タンパク質の産生を阻害する変異と,変化したスプライシングが含まれているため,機能的でないことを示唆しています.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- 進化生物学の進化生物学について
背景:
- 人間のアルファグロービン遺伝子は,酸素輸送に不可欠です.
- 偽遺伝子は,遺伝子進化の洞察を提供できる非機能的な遺伝子コピーです.
- 偽遺伝子形成を理解することは,ゲノム進化の解読の鍵です.
研究 の 目的:
- 人間のアルファ・グロービン擬似遺伝子 (psi alpha 1) の完全な核酸配列を決定する.
- 機能的なアルファ-グロービン遺伝子 (アルファ1とアルファ2) とのpsi alpha 1を比較する.
- 隣接するアルファ-グロービン遺伝子とpsi alpha 1の進化的関係を調査する.
主な方法:
- ヒューマン・アルファ・グロービンの擬似遺伝子 (psi alpha 1) の核酸配列解析
- psiαα1と機能的なヒトα-グロービン遺伝子 (α1,α2) の間の比較シーケンス解析.
- 機能的要素の側面の領域と中間配列の分析.
主要な成果:
- psi alpha 1は,イニシアターコドン変異とフレームシフト削除を含んでおり,アルファ-グロービンポリペプチドを生成することができません.
- 擬似遺伝子は,哺乳類のアルファグロービン遺伝子の典型的な2つの干渉配列を有しているが,スプライシングシグナルが変化している,または存在しない.
- psi alpha 1,alpha 1,およびalpha 2は,それらのポリ (A) 付加部位に隣接する同類配列 (GCCTGTGTGTGCCTG) を共有しており,遺伝子の複製における役割を示唆しています.
結論:
- 人間のアルファ・グロービン擬似遺伝子 (psi alpha 1) は,重大な変異とスプライシングの欠陥のために機能不全である.
- 欠陥にもかかわらず,特徴的な中間配列の存在は,機能的なアルファグロービン遺伝子からの起源を示しています.
- アルファ・グロービン遺伝子の複製単位に接する同型配列は,psi alpha 1のような擬似遺伝子の起源と進化を容易にしたのかもしれない.
関連する概念動画
Organization of Genes
Overview
Gene Families
Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
Protein Families
Protein families are groups of homologous proteins; that is, they have similarities in amino acid sequences and three-dimensional structures. Protein families usually occur because of gene duplication, where an additional copy of a gene is inserted into the genome of an organism. Mutations that change the amino acids but still allow the protein to be properly synthesized, will lead to new protein family members. If these new proteins contain similar amino acids in key locations, protein...
Gene Duplication and Divergence
The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
Exon Recombination
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Duplication of Chromatin Structure
The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...


