構造的な系統遺伝学と古代言語の歴史の再構築
Michael Dunn1, Angela Terrill, Ger Reesink
1Max Planck Institute for Psycholinguistics, Post Office Box 310, 6500 AH Nijmegen, Netherlands. michael.dunn@mpi.nl
Science (New York, N.Y.)
|September 24, 2005
まとめ
言語の構造に生物学的クラディスティクスを用いた新しい言語学的方法は,深い歴史を明らかにします. このアプローチは,現在の限界を超えて人間の分散の研究を拡張します.
科学分野:
- 歴史的言語学の歴史的言語学
- コンピューティング・フィロジェネティクス
- 人間の進化に関する研究
背景:
- 人間の分散を追跡するための伝統的な言語学的方法は,約8,000年に限られています.
- 言語に系統学的方法を適用する以前の試みは,語彙に焦点を当て,浅い時間深さを得ました.
研究 の 目的:
- 初期の人類の分散を研究するための言語学的分析の時間深さを拡張する.
- 言語の構造 (音声学と文法) に生物学的クラディスティック法を適用し,系統遺伝的再構築を行う.
主な方法:
- 言語的特徴 (音声システムと文法) に適用された生物学的クラディスティック・メソッドを利用した.
- 確立されたオセアニック・オストロネシア語族を用いて方法を検証した.
- この方法を,以前は関連性のない,メラネジア島のパプア語に適用した.
主要な成果:
- この研究は,言語構造にクラディスティック・メソッドを成功裏に適用し,歴史的言語学的分析を拡張した.
- パプアの言語は,その地理的分布と相関する,群島ベースの系統遺伝信号を示している.
- この信号は,プレイストセンの後半の分散期における共通の祖先株からの分岐と一致しています.
結論:
- クラディスティック・メソッドを用いた言語構造の系統学的分析は,深い歴史的言語学の実行可能なアプローチである.
- この発見により,パプアの言語は,プレイストセンの末期の人類の分散の一環として,共通の祖先から離れていったことを示唆しています.
- この方法論は,言語的証拠を通して,初期の人間の移住パターンを理解するための新しい道を提供します.
関連する概念動画
03:17Inheritance of Chromatin Structures
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...
02:08Gene 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...
02:54Evolutionary Relationships through Genome Comparisons
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
02:31Synteny and Evolution
John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...
02:37Gene 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.
02:08Gene 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...