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1、中國農(nóng)業(yè)大學博士學位論文黑腹果蠅亮紅眼突變型的遺傳學和分子生物學特性分析姓名:楊軍申請學位級別:博士專業(yè):動物遺傳育種與繁殖指導教師:連林生吳常信20060601中國農(nóng)業(yè)大學博二:學位論文AbstractAbstractAsanidealgeneticmaterialandmodelanimal,Drosophilamelanogasterhasbeenusedforgeneticresearchforabout100yearsComp
2、oundeyetraitssuchaseyeshapeandeyecolorarealwaysthehot—spotsforgeneticresearchThenormalred—browncompoundeyecolorofDrosophilamelanogasterisduetothepresenceoftwotypesofpigmentsThereddrosopterinissynthesizedfromguanineviapte
3、ridineintermediateswhilethebrownxanthommatinisderivedfromtryptophanviafourenzymaticreactionsThepigmentprecursorthentransportedintopigmentcellsbytransmembranetransportersEyecolormutantswithbright—redeyeWasfoundinF2crosspr
4、ogenyofBandprfliesAfterwildtypefliescrossedtoBandprfliesrespectivelymutantbright—redeyeflieswereobtainedinF2progenyofwildtypeandBfliesbutnoeyecolormutantswasfoundincrossprogenyofwildtypeandprflieseveninF7progenyPurebrigh
5、t—redeyeflylineWasobtainedbyinbreedingThemutantgeneresponsibleforthebright—redeyewasidentifiedasanalleleofscarletgenewhichlocatesonchromosome3afterthebright—redeyefliesWascrossedwithtypeflies,underwenttwo—pointtestswithv
6、gandemutantsandcomplementationtestswitheyecolormutantscn。,st。andV。respectivelyThebrightredeyemutantflylinewasnamedass亡rEyepigmentofwildtype,B,stb7andst。fliesWasextractedandtheabsorbanceWasmeasuredEyepigmentcontentofdiffe
7、rentflylinesWasanalyzedbysignificancetestThexanthommatincontentdifferencebetweenwildtypeandeyecolormutantsstb7andst。isextremelysignificant(JP005)NosignificantdifferenceofxanthommatincontentWasfoundbetween5,andst。flies(P0
8、05)Bflieshavemuchmorexanthommatinthans產(chǎn)randst/flies‘P如01)butsignificantlylessthanwildtypeflies(POO1)ItisconcludedthatlowlevelofxanthommatincontentinthecompoundeyeisresponsibleforthemutantbrightredeyephenotypeSixpaimofpri
9、mersweredesignedforamplifyingscarletgeneA75一kb412elementinsertionwithinexon4ofscarletgeneWasdetectedinB,spandstiflieswiththefourthpairprimersThe412elementinsertedinto1612‘“bp~1613mbpofst。scarletgenewitha450bplossof5“LTRi
10、nthesamedirectiontosc口mftranscriptionwhilethe412elementinsertedinto1722ndbp1723阿bpofs,scarletgeneinthereversedirectiontoscarlettranscriptionRTPCRforexonsamplificationofdifferentflylinesWasperformedSevenexonswithnosequenc
11、ealterationwereamplifiedinwildtypeandBfliesandexons13withnosequencealterationwereamplifiedinspandstlfliesTherewerenocDNAproductsamplifiedwhichiscorrespondenttothesequencebetweenexon4‘“to7mKeywords:Drosophilamelanogaster,
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