Help about computers applied to Biology

[J. Ibave]

Hello, I'm working on developing an algorithim to determine the DNA 
sequence of a natural polypeptide based on a polypeptide which has suffered
a mutation. I'm analyzing this kind of situations and can't figure out an
efficient method to determine which was the mutation. (insertion, deletion
or a change of nucleotides).
If you are working on something similar, I will appreciate your help.
              Thanks a lot.
                                  Luis Arturo Medrano Soto

Dr. Jose L. Ibave
Facultad de Ciencias Agrotecnologicas
P.O. Box 24
University of Chihuahua
Chihuahua, Chih. Mexico 31000
tel. (voice) 0152+14+146615
     (fax)   0152+14+134888