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ChIP sample storage - (Mar/28/2005 )

Does anyone has the same situation?
After I sonic my sample and centrifuge them , aliquot them , put them -80c, this morning , when I dissove them on ice , they all have the precipitate.I know it bz the SDS in it, but do I need warm them to let tehm clear or centrifuge again?
I need to continue IP.
Thanks thousand times!
wll

-wllway-

Don't worry. That's normal and it's OK to store samples after sonication.

-pcrman-

If you let the sample warm to room temp, the precipitate should dissolve away again, although not doing this step has not affected my IP's in the past.

Nick

-methylnick-

Hello. I am a little confused about this step. I found two ways to store the sample. One like that: after sonication, then centrifuge, divide supernatant as 200ul per aliquot, store it directly to -80 degree.

The other like that: add ChIP dilution buffer to the 200ul aliquot, then store to -80 degree. Is there any difference? or I must add ChIP dilution buffer before storing sample to -80? What do you ususally do? Thank you very much. I am naive in this field.

-seenew-

QUOTE (seenew @ Apr 22 2005, 02:36 AM)
Hello. I am a little confused about this step.  I found two ways to store the sample. One like that: after sonication, then centrifuge, divide supernatant as 200ul per aliquot, store it directly to -80 degree. 

The other like that: add ChIP dilution buffer to the 200ul aliquot, then store to -80 degree.  Is there any difference? or I must add ChIP dilution buffer before storing sample to -80? What do you ususally do? Thank you very much. I am naive in this field.


Well you can add dilution buffer, however it will diulte your sample, I have stored all my samples without the addition of dilution buffer. Are you using Upstates CHIP kit?

Nick

-methylnick-

Well you can add dilution buffer, however it will diulte your sample, I have stored all my samples without the addition of dilution buffer. Are you using Upstates CHIP kit?

Nick


[/quote]


Yes, I use ChIP kit from Upstate. But unfortunately, I never made it work. There are always problems.

-seenew-