Help! Amino acid homology <50%
Mary P. Remington
mremingt at umaryland.edu
Thu Apr 1 11:54:39 EST 1999
How significant is a homology at the amino acid level (between different
species) of less than 50%? I have PCR-ed a gene from a cDNA using the 5'
and 3' sequence from a sequence in Genbank. The fragment I amplified
bears no resemblence to the Genbank sequence. The Genbank sequence in
question when translated is less than 50% homologous to the same gene from
different species. There is a much higher degree of homology between the
other species than the one species I am trying to amplify.
The Genbank sequence in question was generated from probing a cDNA
library. This generated a 3' clone. The 5' end was generated by using
the RACE protocol. So, I am wondering if there might not be a problem
with the sequence. Any suggestions or ideas appreciated. Thanks, Mafy
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