deletion mutant in Cyanobacteria

Edgar Valencia edgar at
Wed Jun 19 10:24:05 EST 1996

Hi Farid:
I guess what you want to do after having your construction will be to 
introduce this construction into your strain and try to get the double 
recombinant isnt it? Well, if this is what you want to do i think wont be 
problem if the size of your casstte is different from the size of the 
cloned fragment  you will replace. Instead, the problem will be how much 
homology remains bordering your cassette, the lesser, the harder to get 
the double recombinants
I hope this helps
good luck
                          Edgar Valencia Morales
                    Departamento de Genetica Molecular
                               CIFN - UNAM
                        e-mail edgar at

On Tue, 18 Jun 1996, Farid jalali wrote:

> Hello,
> I have designed a construct where a cloned cyanobacterial restriction 
> fragment will be cut, a region of the fragment removed, and in its place 
> a cassette conferring resistance to an antiobiotic will be placed. My 
> question deals with the fact that the region I will remove is not the 
> same size as the cassette. The species I work with undergoes homologous 
> recombination quite readily, and I am wondering if removing a region 
> from the construct that is larger than the genomic region is going to be 
> a problem. 
> I hope this doesn't sound to confusing. Any info would be greatly 
> appreciated.
> Thanks 
> Farid Jalali
> Department of Botany
> Erindale College
> University of Toronto

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