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#1 Re: rf-cloning troubles » trouble with 2nd PCR! Please help » 2019-06-23 07:47:27

Hi,
another thing: what did you mean by :"you're trying to remove the better part of a KB of parental sequence".
indeed the deletion /replacement that I try to do is about 700bp, is is too long? an and the insert is 672bp long.
it would be graet if you could comment on it.
Hyla

#2 Re: rf-cloning troubles » trouble with 2nd PCR! Please help » 2019-06-23 07:24:17

Hi,
thanks for your reply. the 2nd PCR reaction are as the following:
I then set up and ran the secondary PCR with the quantities of insert: plasmid and elongation time  indicated in the website using the 3-step protocol. I used Phusion polymerase.
The cycle was as follows:
98°C 30"
98°C 10"
61°C  30''
72 °C 3'
72 °C 5'
72°C 5'   
total of 35 cycles
would you suggest me to try 2 step PCR?
Thanks

#3 rf-cloning troubles » trouble with 2nd PCR! Please help » 2019-06-20 14:57:30

hyla
Replies: 4

Hi,
I used the website to design the primers for 1st PCR. You can see the details here.
I sequenced the 1st PCR product and it seems that I have it correct however after the 2nd PCR (tried different annealing temp 61 to 68), I get colonies only with parental plasmid.
I would appreciate your tips and help.
the insert size is 672 bp long.
Best,
Hyla

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