人間のサブテロメアは,染色体間再結合とセグメンタル重複のホットスポットです

Elena V Linardopoulou¹, Eleanor M Williams, Yuxin Fan

¹Division of Human Biology, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North C3-168, Seattle, Washington 98109, USA.

Nature

|September 2, 2005

まとめ

人間のサブテロメアは,染色体の末端で,最近,繰り返しDNAの転位によって形成されました. 非同類の末端結合は主要な修復メカニズムであり,急速な進化と染色体末端の遺伝子複製を推進する.

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
分子遺伝学分子遺伝学

背景:

人間のサブテロメアは,染色体末端にある複雑な領域です.
これらの領域は,ポリモルフなセグメンタル重複で構成されています.
彼らの形成と進化は完全に理解されていません.

研究の目的:

サブテロメア複製形成のメカニズムを調査する.
サブライン領域の進化のダイナミクスを理解する.
ゲノム進化とヒト生物学に対するサブテロメア変化の影響を評価する.

主な方法:

比較ゲノミクスとは
サイトジェネティック分析
シーケンス分析シーケンス分析
サブテロメア領域の系統遺伝分析

主要な成果:

サブテロメアパッチワークは,再発的な転位によって最近発生した.
非同類の末端結合は,サブテロメア複製の主要なメカニズムである.
サブテロメア領域は,高度の染色体間再結合と配列移転を示しています.
人間のサブテロメア配列の有意な部分は,最近,人間特異的な出来事によって形成されました.
サブテロメア動態は,高い遺伝子複製率に寄与する.

結論:

サブテロメアの進化は,急速な変化とセグメンタル不安定性が特徴です.
これらのダイナミクスは遺伝子複製率に影響を与え,人間の健康に影響を及ぼします.
セグメンタルポリモルフィズムとゲノム再編成の間に進化のサイクルが存在します.

さらに関連する動画

12:16

Robust 3D DNA FISH Using Directly Labeled Probes

Published on: August 15, 2013

11:49

Enhanced Genetic Analysis of Single Human Bioparticles Recovered by Simplified Micromanipulation from Forensic ‘Touch DNA’ Evidence

Published on: March 9, 2015

関連する概念動画

01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...

02:40

Chromosome Structure

A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...

02:30

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...

02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...

02:53

Conservative Site-specific Recombination and Phase Variation

Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...

02:32

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...

関連する実験動画