美國(guó)康奈爾大學(xué)研究人員利用果蠅研究得出結(jié)論,，一見(jiàn)鐘情可能真實(shí)存在并且由基因決定。這一結(jié)論可能同樣適用于包括人類(lèi)在內(nèi)的哺乳動(dòng)物,。
研究人員用一組雌性果蠅分別與一組同種類(lèi)雄性果蠅和一組不同種類(lèi)雄性果蠅交配。結(jié)果發(fā)現(xiàn)，當(dāng)雌性果蠅與不同種類(lèi)雄性果蠅交配時(shí),，它們似乎可以識(shí)別,，后者與同類(lèi)雄性果蠅相比，在基因上與它們更加契合,。原因可能是雌性果蠅與不同種類(lèi)雄性果蠅交配產(chǎn)生的后代更不易因近親繁殖出現(xiàn)基因缺陷,，產(chǎn)卵數(shù)量更多，成活率更高,。
這項(xiàng)研究表明,，雌性果蠅在一定程度上與雄性果蠅見(jiàn)第一面時(shí)，就能確定對(duì)方是否為“好伴侶”,。如果答案為“是”,，雌性果蠅隨后會(huì)發(fā)生生理反應(yīng)，以提高繁殖成功率,。
研究發(fā)起人之一安德魯·克拉克說(shuō)：“你可以稱(chēng)這種現(xiàn)象為‘一見(jiàn)鐘情’,，這樣描述更準(zhǔn)確，因?yàn)槲覀冄巯律胁磺宄悄姆矫嫣卣髯尨菩怨壸鞒雠袛唷?rdquo;他解釋說(shuō),，這可能是視覺(jué)、嗅覺(jué),、聽(tīng)覺(jué)或其他感覺(jué),。
研究人員說(shuō)，研究結(jié)果可能同樣適用于包括人類(lèi)在內(nèi)的哺乳動(dòng)物,。女性有可能分辨出哪些男性與她在基因上更適合,，從而身體作出反應(yīng)，提高繁殖成功率,。但由于果蠅與人類(lèi)繁殖方式差別較大,，尚無(wú)法直接把實(shí)驗(yàn)結(jié)論應(yīng)用于人類(lèi)。
這一研究論文發(fā)表在《遺傳學(xué)》（Genetics）雜志2009年4月刊上,。（生物谷Bioon.com）
生物谷推薦原始出處：
Genetics, Vol. 181, 1273-1280, April 2009, doi:10.1534/genetics.108.099622
Strain-Dependent Differences in Several Reproductive Traits Are Not Accompanied by Early Postmating Transcriptome Changes in Female Drosophila melanogaster
Lisa A. McGraw*,1, Greg Gibson, Andrew G. Clark* and Mariana F. Wolfner*,2
* Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York 14853 and School of Integrative Biology, University of Queensland, Brisbane QLD 4072, Australia
2 Corresponding author: Department of Molecular Biology and Genetics, Cornell University, 423 Biotechnology Bldg., Ithaca, NY 14853.
Upon mating, Drosophila melanogaster females undergo numerous alterations in their behavior and reproductive physiology that are accompanied by small-magnitude transcript-level changes in up to 1700 genes. Many of these postmating transcriptome changes are the direct result of the sperm and seminal fluid proteins (Acps) that females receive from their mates. To begin to determine if the genetic background of the female's mate contributes to the previously described gene expression changes, we assessed whether interactions between the genotypes of two commonly used laboratory strains of D. melanogaster (Canton-S and Oregon R) influence the female's postmating transcriptome as well as several pre- and postcopulatory phenotypes. We find negligible differences in the female's transcriptome at 1–3 hr postmating regardless of the strain of the male with whom she mated. However, a male x female genotype interaction significantly influenced mate selection, and, in some cases, fecundity, fertility, and hatchability. Our data support previous work suggesting that many of the early postmating changes observed in D. melanogaster females are not caused by large modifications of transcript levels. Instead, early postmating phenotypes result from preexisting receptors or pathways that are already in place upon sexual maturity.
