Bdh1l遺伝子発現は,カロチノイドベースの色彩多様性の進化における潜在的な分子因子である
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PubMedで要約を見る
まとめ
この要約は機械生成です。この研究では,3 - ヒドロキシブチラート脱水素酵素1型 (bdh1l) という遺伝子がカロチノイドの色変化を誘発する分子スイッチとして作用することが明らかになった. bdh1lとhsd3b遺伝子の差異表現は,それぞれ赤と黄色に結びついている.
科学分野
- 進化生物学
- 分子遺伝学
- 生物化学
背景
- カロチノイドは動物の色付けに不可欠ですが,赤と黄色の色の間の進化的シフトの分子基盤は未知のままです.
- カロチノイドベースの色進化を研究するために,複製された色変異を持つモデルシステムをシヒリド魚が提供しています.
研究 の 目的
- 赤と黄色のカロテノイド色差の基礎にある生化学的および遺伝的メカニズムを調査する.
- 異なるケトカロテノイドの生物合成に関与する重要な遺伝子と経路を特定する.
主な方法
- 赤いシチリドの皮膚におけるケトカロテノイドの分析
- 改良されたバイオインフォマティクスパイプラインを使用して,赤と黄色のシチリドの皮膚からRNA配列データを再分析する.
- 密接に関連したシチリドの3組の遺伝子発現を比較した分析
主要な成果
- 赤色の皮膚のサンプルには ロドキサンチン,カンタキサンチン,アスタゼンを含むケトカロテノイドが含まれていた.
- 3ヒドロキシブチラート脱水素酵素1型 (bdh1l) と他のカロテノイド関連遺伝子 (scarb1,bco2,ttc39b) の発現が著しく高かったのは,研究された全ての分類群の皮膚に比べて赤色であった.
- シトクロームP450遺伝子発現の一貫した差異は見つかりませんでしたが,これはbdh1Iの調節がC4-ケトカロテノイドのバイオシンセシスの鍵であることを示唆しています.
- hsd3bの差異的発現は,他のケトカロテノイドと異なる経路であるロドキサンチン生物合成における潜在的な役割を示唆する.
結論
- bdh1I発現の調節は,C4-ケトカロテノイド生物合成とシチリドの色差分化のための分子スイッチとして機能する.
- この発見は,カロテノイド経路の進化と色彩の多様化における特定の脱水酵素の役割を強調しています.
- ロドキサンチンと他のケトカロテノイドのような異なるカロテノイドの生物合成の基礎となるのは,異なる遺伝的メカニズムである.
関連する概念動画
Overview
An organism is diploid if it inherits two variants, or alleles, of each gene, one from each parent. These two alleles constitute the genotype for a given gene. The term genotype is also used to refer to an organism’s complete set of genes. A diploid organism with two identical alleles has a homozygous genotype, whereas two different alleles indicates a heterozygous genotype. Observable traits arising from genotypes are called phenotypes, which can also be influenced by...
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...
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.
In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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...
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.
According to Mendel, organisms with both copies or a single copy of the dominant allele display a...