Annealing temperature for oligos

Ken Howe howe at DARWIN.UCSC.EDU
Thu Nov 23 12:50:20 EST 1995


Thomas,
Your formulas are basically the same.  What Adela was using it to 
determine was annealing temperature, which, for short oligos, is 
generally taken as 5-6 degrees below the Tm.
Ken

On 22 Nov 1995, Thomas Urbig 
wrote:

> Date: 22 Nov 1995 16:44:03 GMT
> From: Thomas Urbig <Thomas at hastingsmac2.fas.harvard.edu>
> To: methods-and-reagents at net.bio.net, Adela.Torres at uv.es
> Subject: Re: Annealing temperature for oligos
> 
> Adela.Torres at uv.es (Adela Torres Calatayud) wrote:
> >Hi everybody:
> >
> >I'm currently working on DNA non-radioactive cycle sequencing, and I'd like to 
> >know if there is a reliable formula by which I can choose the annealing 
> >temperature of the PCR program when I'm sequencing using custom-made oligos. 
> >Right now the formula I'm using is:
> >
> >		2(A+T) + 4(G+C) - 6 = T ann.
> >
> >But it didn't give me good results when I tried it. So if there's anyone out 
> >there that can help me, thanks very much! E-mail or post.
> >
> >					Adela Torres
> >				         (Adela.Torres at uv.es)
> 
> I don't where you got the formula, the one I am using Is 
> 
> Tm = 4(G+C) + 2(A+T)
> 
> Ref.: Thein and Wallace 1986, Human Genetic Deseases: A practical approach, K. E. Davis, ed., IRL Press
> 
> Hope that helps
> 
>                 Thomas
> 
> 
> 
> 



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