合成の母性効果の利己的な遺伝子要素が,ドロソフィラの集団の交換を促している
Chun-Hong Chen1, Haixia Huang, Catherine M Ward
1Division of Biology, Mail Code 156-29, California Institute of Technology, Pasadena, CA 91125, USA.
Science (New York, N.Y.)
|March 31, 2007
まとめ
研究者は,野生の集団を通して病気に対する耐性を急速に拡散するために,果物ハエの遺伝子要素をエンジニアリングしました. この戦略は,迅速な遺伝子駆動を確保し,機能的な解離を防止することによって,昆虫媒介の病原体伝播を制御することを目的としています.
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.
- エントモロジー エントモロジー学
背景:
- 昆虫媒介の病原体は,公衆衛生に重大なリスクをもたらす.
- 遺伝子駆動戦略は,疾患ベクトルを制御するために探索されています.
- 病原菌の伝播を制御するには,野生の昆虫の個体数を変化させるための効果的な方法が必要です.
研究 の 目的:
- ドロソフィラの新しい母性効果の利己的な遺伝子要素を作成する.
- 再結合媒介による解離に抵抗する遺伝子駆動システムを開発する.
- 疾病耐性で人口を迅速に置き換えるためのメカニズムを確立する.
主な方法:
- ドロソフィラの母性効果の利己的な遺伝子要素を設計した.
- 母体で発現する遺伝子のマイクロRNA媒介による静止を活用した.
- 配合された遺伝子サイレンシングと,救助トランスゲンの初期のジゴティック発現.
主要な成果:
- ドロソフィラが母性効果の利己的な遺伝子要素を成功裏に作り出した.
- 再結合媒介による駆動と屈折性の解離に対する耐性を示した.
- 人口置換のための機能的な遺伝子駆動システムを確立した.
結論:
- 母性効果の利己的な遺伝要素は,人口置換のための有望な戦略を提供します.
- このアプローチは,昆虫集団における病気の耐火性の拡散を容易にする可能性があります.
- 開発されたシステムは,昆虫媒介の病気の伝播を制御する可能性を示しています.
関連する概念動画
02:45The Ratio of X Chromosome to Autosomes
In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
01:09Mutation, Gene Flow, and Genetic Drift
In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
03:33Genetic Drift
Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.Life is not fair. A deer grazing contentedly in a field can have her meal cut tragically short by a bolt of lightning. If the doomed doe is one of only three in the population, 1/3 of the population’s gene pool is lost. Random events like this can...
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.
01:21Frequency-dependent Selection
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.Positive Frequency-Dependent SelectionIn positive...
02:39Gene Flow
Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.