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Polygenic Traits01:18

Polygenic Traits

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When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
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Synteny and Evolution02:31

Synteny and Evolution

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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...
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Incomplete Dominance01:43

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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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Human Genetics01:28

Human Genetics

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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Genetics of Speciation02:16

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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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Updated: Sep 9, 2025

Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
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人 の 手 と 足 の 進化 の 基礎 に ある 複雑 な 遺伝子 の 構造

Alexander Okamoto1, Gayani Senevirathne1, Pushpanathan Muthuirulan1

  • 1Harvard University.

Research square
|September 2, 2025
PubMed
まとめ

ヒトの進化は双脚運動のために手と足 (オートポッド) の重要な骨格の変化を伴う. 遺伝分析はオートポッドの発達におけるヒト特有の規制要素を明らかにし,進化的適応におけるその役割を強調する.

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科学分野:

  • 進化生物学
  • 発達生物学
  • ゲノミクス

背景:

  • 人間の進化における二足の移動は,特に手と足 (オートポッド) の大きな骨格の修正を必要とした.
  • 霊長類の前肢と後肢は連続的に同型であり,オートポッドの統合的な進化的変化を示唆している.
  • 以前の研究では 手足の適応を 単独で調べたことが多かったのです

研究 の 目的:

  • ヒトのオートポッド進化の 遺伝的基盤を調査する
  • 人間の手足の骨の発達における規制要素と遺伝子発現パターンを特定する.
  • 遺伝子調節とオートポッドの形態学的変化の関連性を調べる

主な方法:

  • 機能的ゲノミクス技術が採用された.
  • ファランゲとメタカルパルの発達における遺伝子発現と規制要素の分析.
  • 異なる組織と発達時のゲノム特性の比較

主要な成果:

  • 遺伝子の発現と調節パターンは近辺-遠端軸に沿って,そして発達期にわたって変化した.
  • 手足のタイプや個々の指の間の遺伝子発現や調節において,有意な差異は観察されなかった.
  • 何千ものヒト特有のゲノム特徴がオートポッドの規制要素の中で特定され,その中には広範な組織アクセシビリティを示し,他のものは組織特異的であった.

結論:

  • 人間の手足の進化は 複雑なゲノム構造によって支えられています
  • オートポッドの発達と進化の形づくりに 重要な役割を果たしています
  • 前肢と後肢の調整された進化の洞察を 提供しています