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狗从哪里来 基因研究揭晓答案【亚博买球】

2020年12月7日 - 科技

本文摘要:Where do dogs come from?

亚博买球

Where do dogs come from? 狗是从哪里来的? graywolvesaretheirancestors.scientistsareprettyconsistentaboutthat.andresearchershavesuggestedthatdogs’originscanbout在这件事上研究人员认为,狗的起源可以追溯到欧洲、近东、西伯利亚和中国南方。在centralasiaisthenewestandbestcandidate、accordingtoalargestudyofdogsfromaroundtheworld .对世界各地狗展开的大规模研究中,狗最有可能的发源地Laura m.shannonandadamr.boykoatcornelluniversity,andaninternationalgroupofotherscientists, studiednotonlypurebrees butalsostreetorvillagedogs-thefree-rangingscavengersthatmakeupabout 75 percentoftheplanet’sonebillionde 劳拉m莎伦(Laura M. Shannon )和亚当r博伊科(Adam R. Boyko )与其他科学家一起组成了国际研究小组。该小组不仅调查了纯种狗,还调查了路上和乡村狗——世界共计10亿只狗,其中约75%是有权访问的流浪狗。

dr.shannonanalyzedthreedifferentkindsofdna,Dr. Boyko said,thefirsttimethishasbeendoneforsuchalargeanddiversegroup more than 4, 500 dogs of 161 breeds and 549 villagedogsfrom 38 countries.thatallowedtheresearcherstodeterminewhichgeographicgroupsofmoderndogswee o ns genetically.andthatledthemtocentralasiaastheplaceoforiginfordogsinmuchthesamewaythatgeneticstudde havelocatedtheoriginofmodes 博伊科博士首次对如此多、多样的狗展开了研究。包括161多种狗。因此,研究者有必要分析哪个现代狗的地理群落在基因上最像祖先群体。

基因研究确认了现代人来自东非,但他们也用几乎同样的方式确认了犬类的发源地是中亚。The analysis,Dr. Boyko said,pointed to Central Asia,including Mongolia and Nepal, astheplacewhere“allthedogsalivetoday”come from.thedatadidnotallowprecisedatingoftheorigin,he said是butshoweditoccurredatlean 000 years ago.theyreportedtheirfindingsmondayinproceedingsofthenationalacademyofsciences .他说这些数据足以准确测量起源,而且本周一,他们的报告发表在《美国国家科学院院刊》 (proceedingsofthenationalacademyofsciences )上。Greger Larson of Oxford University,whoisleadingalargeinternationalefforttoanalyzeancientdnafromfossilizedbones, saidhewasimpressedbythescopeofthestudy .“it’sreallygreattoseenotjustthesheernumberofstreetdogs, butalsothegeographicbreadthandthenumberofremotelocationswherethedogsweresampled, “hesaidinanemail.healsopraisedthesamplingofdifferentkindsofdnaandtheanalyticmethods .牛津大学的格雷格拉森(Greger Larson )拉森他在邮件中说:“这项研究中包括的流浪狗数量,与狗取样相关的地区面积和边远地区数量,是真的。” 他还称赞了采样不同种类DNA的做法和分析方法。

But in the world of dog studies,verylittleisdefinitive.themostrecentcommonancestoroftoday’sdogslivedincentralasia, dr althoughhecannotruleoutthepossibilitythatsomedogscouldhavebeendomesticatedelsewhereanddiedout.ordogsdomesticatedelsewherecc somewhereelseandthendiversifiedintoallthecaninesalivetoday,he said .但是,在犬类研究领域,确认的研究很少。博伊科博士回答说,现有犬种的最近祖先住在中亚,但有些狗只能在其他地方被驯养灭绝。

他回答说,在其他地方驯养的狗从其他地方回到中亚后,随着多样化的发展,进化成了现有的所有犬种。Dr. Larson,who was not involved with the study, saidhethoughtthecentralasiafindingrequiredfurthertesting.hesaidhesuspectedthattheoriginsofmoderndogswere“extremely messing”t populationswillbedefinitive.hesaidacombinationofstudiesofmodernandancientdnaisnecessary .没有参加。他指出现代狗的起源“非常可怕”,即使再继续取样现存的狗也无法确认。

他回答说必须融合现代和古代对DNA的研究。dr.boykosaidthenewresearchforthefirsttimeanalyzedthreesourcesofdnafrombothpurebredandvillagedogsworldwide.theteamanalys romas nucleus,from the Y chromosome specifically,found only in males,and from mitochondria,cellularenergymachinesoutsidethenucleusthatares 该小组分析了细胞核的所有染色体,以及只有公犬搭载的y染色体和线粒体的DNA,线粒体是位于母体遗传的细胞核外的细胞能量生产结构。

dr.boykotraveledtoanumberofthelocationswherebloodwasdrawnfromvillagedogs.he said, “thegreatthingaboutworkingwithdogsisthatifyoushowupwithfoodyoudon’tusuallyhavetroublerecruitingsubjects.usually .”与狗一起工作的最巴一般来说是这样的。》he added :“weshowedupinpuertoricoatafishingvillageandthedogsturneduptheirnosesatroastbeefsandwiches.theywereusedtoears”他。

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