関連する実験動画
Updated: Jul 10, 2026
10:55
Retrograde Labeling of Retinal Ganglion Cells in Adult Zebrafish with Fluorescent Dyes
Published on: May 3, 2014
SLC24A5は,推定カチオン交換体であり,ゼブラフィッシュとヒトの色素に影響を及ぼします
Rebecca L Lamason1, Manzoor-Ali P K Mohideen, Jason R Mest
1Jake Gittlen Cancer Research Foundation, Department of Pathology, The Pennsylvania State University College of Medicine, Hershey, PA 17033, USA.
Science (New York, N.Y.)
|December 17, 2005
まとめ
ゼブラフィッシュの黄金の遺伝子変異は,より明るい人間の肌に似たメラノソームの発達に影響します. 人間のSLC24A5遺伝子の変異は,ヨーロッパの集団におけるより明るい肌の色素化に関連しています.
科学分野:
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
- 人間の色素化
背景:
- 人間のより軽い色素は,メラノソームの数,サイズ,密度の減少と関連しています.
- メラノソームは,皮膚や髪の色を決定する重要な臓器である.
研究 の 目的:
- 肌の色素の違いの遺伝的根拠を調査する.
- 斑馬魚の"黄金色"変異の原因となる遺伝子を特定し,メラノソームの生体生成におけるその役割について.
- 皮膚の色素化に関連して,ヒトのオートロログ,SLC24A5の進化史と集団遺伝学を探求する.
主な方法:
- ゼブラフィッシュの遺伝子スクリーニングと変異分析.
- 黄金の遺伝子を特定するために,遺伝子クローンと配列を決定する.
- 表現分析とサブセルラー局所化研究.
- 人間SLC24A5.5の比較ゲノミクスと集団遺伝分析
主要な成果:
- 斑馬魚の黄金色変異は,slc24a5 (nckx5) 遺伝子の欠陥として特定されました.
- slc24a5は細胞内膜に局所化し,おそらくメラノソームまたはその前駆体である.
- 人間のSLC24A5オーソログは,ゼブラフィッシュに機能的に似ている.
- ヒト特有のSLC24A5アレルはヨーロッパ人群に多く見られ,肌の明るさと遺伝的多様性の減少と関連しています.
結論:
- SLC24A5はメラノソームの生体生成と色素化において重要な役割を果たします.
- 進化的に保存されたSLC24A5遺伝子は,ヒト集団で強い選択を受け,肌の色の変化に寄与しています.
関連する概念動画
01:19X-linked Traits
In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
02:32Position-effect Variegation
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
02:27Background and Environment Affect Phenotype
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
02:32X and Y Chromosomes
Among mammals, the gender of an organism is determined by the sex chromosomes. Humans have two sex chromosomes, X and Y. Every human diploid cell has 22 pairs of autosomes and one pair of sex chromosomes. A human female has two X chromosomes, while a male has one X chromosome and one Y chromosome.
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...