PCR not consistent

[elynn]

Dear everyone,

I have a problem with my PCR. Its not consistent. Sometimes i got bands on my gel and sometimes i don't get bands. however the mixture and pcr protocol is the same. I hv check my DNA and primers and they're in good conditions. Is it normal to have this kind of problem? Can anyone suggest some solutions?

Thanks

[emadsadeghian]

have u tried adding dmso?

[gislab03]

Do you include positive control for every run and does the positive control give appropriate band? And agarose gel is also important in visualising the results. You should use freshly prepared agarose and ethidium bromide solution.