関連する実験動画
Updated: Jul 21, 2026

07:42
Dissection of Hippocampal Dentate Gyrus from Adult Mouse
Published on: November 17, 2009
まとめ
ヒトの胚性ゼータ・グロービン遺伝子は,異なる進化の経路を示している. 1つのゼータ・グロービン遺伝子は機能的であり,もう1つはユニークなイントロンと進化の歴史を持つ擬似遺伝子である.
科学分野:
- ゲノミクスゲノミクスとは
- 進化生物学の進化生物学について
- 分子生物学は分子生物学である.
背景:
- 人間の胚の発達には,特定のグロービン遺伝子発現が含まれています.
- アルファ型およびベータ型グロービンの遺伝子ファミリーは,異なる役割と進化的起源を持っています.
研究 の 目的:
- 人間の胚性グロービン遺伝子,特にゼータ (ζ) とエプシロン (ε) の進化的分岐を調査する.
- 人間のゼータ・グロービン遺伝子のイントロンを含む構造的特徴を分析する.
主な方法:
- 人間の胚性アルファ型グロービン遺伝子のDNAシーケンシング.
- ゼータおよびアルファグロービン遺伝子の比較配列解析.
- イントロンの配列と重複要素の分析.
主要な成果:
- 3つの塩基対によって異なる1つの機能的なヒトゼータ (ζ) グロービン遺伝子と1つの擬似遺伝子 (ψζ) を特定しました.
- この2つのゼータグロービン遺伝子は,単純に繰り返される配列 (ACAGTGGGGAGGGGとCGGGG) の大きなイントロンを有しています.
- 人間のアルファ型およびベータ型胚性グロービンの遺伝子は,進化の異なる分岐時間 (4億対2億年前) を表しています.
結論:
- ゼータとエプシロン・グロービン遺伝子の進化史は,発達過程で協調的に発現したにもかかわらず,区別されています.
- 構造分析により,ゼータ・グロービン遺伝子イントロンのユニークな特徴が明らかになり,特定の調節的役割が示唆されています.
- 比較ゲノミクスは,アルファ型グロービン遺伝子ファミリー内の早期の分岐を強調しています.
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...
Histone Variants at the Centromere
Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3 variants are also...
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...

