DNA提取纯化试剂

Extraction of genomic DNA from whole blood

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Author:Laura-LeeBoodram
Source:Laura-LeeBoodram,DepartmentofLifeSciences,TheUniversityoftheWestIndies
Abstract:Theprotocolissimpleandfairlyrapid.Itdoesnotrequiretheuseoforganicsolventsbutratherutilizessaltextractiontoprecipitatecontaminatingproteins.HighqualityDNAisobtainedsuitableforimmediatePCRapplications.Onecanobtainapproximately100-200ugofDNAfrom4-8mLoffreshorfrozenwholeblood.

Reagents

BufferA(Redbloodcelllysisbuffer)composition

  • 0.32Msucrose
  • 10mMTrisHCl
  • 5mMMgCl2
  • 0.75%Triton-X-100

AdjustpHto7.6

BufferB(ProteinaseKbuffer)composition

  • 20mMTris-HCl
  • 4mMNa2EDTA
  • 100mMNaCl

AdjustpHto7.4

N.B.Allsolutionsshouldbesterile.BufferAshouldbeautoclavedpriortoadditionofTriton-X-100.Sterilefilteringofsolutionsinsteadofautoclavingisabetteroption.Procedure

  1. Add1volumeofbufferAto1volumeofbloodand2volumesofcold,sterile,distilled,deionisedwater.Vortexgentlyorinverttube6-8timesandleavetoincubateonicefor2-3minutes.
  2. Spinat3500rpmfor15minutesat4oC.Discardsupernatantinto2.5%bleachsolutionandre-sUSPendpellet(vortexfor30secondsatmediumspeed)in2mlofbufferAand6mlofwater.Spinat3500rpmfor15minutesat4oC.Thepelletshouldbewhitetocreamincolour.Ifpelletissignificantlyred,repeatwashingstepagain.
  3. Add5mlofBufferBand500µlof10%SDStopellet.Re-suspendpelletbyvortexingvigorouslyfor30-60seconds.Thenadd50µlofProteinaseKsolution(20mg/ml).TheProteinaseKsolutionshouldbemadefreshandrefrigeratedpriortouse.
  4. Leavetoincubatefortwohoursat55oCinawaterbath.Removesamplesandleavetocooltoroomtemperature(orleavefor2-3minutesonice).Add4mlof5.3MNaClsolution.Vortexgentlyfor15seconds.
  5. Spinat4500rpmfor15-20minutesat4oC.Pouroffsupernatantintoafreshtube.Takecarenottodislodgepellet.Addanequalvolumeofcoldisopropanol(storedat-20oC).Invert5-6timesgentlytoprecipitateDNA.
  6. RemoveDNAwithawideboretipandtransfertoamicrofugetube.Washwith1mlof70%ethanol.LeaveDNAtodryfor15-20minutesat37oC.Re-suspendin300-400µlofTrisHCl,pH8.5(notTE!).Leavetore-dissolveovernightatroomtemperature.DNAcanbesafelyrefrigeratedforuptoayear.Long-termstoragemayinvolveethanolat-70oC.

References

  1. Helms,C.SaltingoutProcedureforHumanDNAextraction.InTheDonis-KellerLab-LabManualHomepage[online].24April1990.[cited19November2002;11:09EST].Availablefrom:http://hdklab.wustl.edu/lab_manual/dna/dna2.html.
  2. Epplen,J.E.,andT.Lubjuhn.1999.DNAprofilingandDNAfingerprinting.BirhkhauserVerlag,Berlin.p.55.