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Cai, W., Jin, Y., Girton, J., Johansen, J., Johansen, K. M. Preparation of Drosophila Polytene Chromosome Squashes for Antibody Labeling. J. Vis. Exp. (36), e1748, doi:10.3791/1748 (2010).
Cai, W., Bao, X., Deng, H., Jin, Y., Girton, J., Johansen, J. & Johansen, K.M. RNA polymerase II-mediated transcription at active loci does not require histone H3S10 phosphorylation in Drosophila. Development 135, 2917-2925, (2008).
DiMario, P., Rosby, R., & Cui, Z. Direct visualization of GFP-fusion proteins on polytene chromosomes. Dros. Inf. Serv. 89, 115-118, (2006).
Johansen, K.M., Cai, W., Deng, H., Bao, X, Zhang, W., Girton, J. & Johansen, J. Methods for studying transcription and epigenetic chromatin modification in Drosophila polytene chromosome squash preparations using antibodies. Methods 48, 387-397, (2009).
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Fixative 1. mix 50 ul 10X PBS, 5μl Triton X-100, 345 ul dH2O and 100 ul of 5X formaldehyde stock. Warm to disperse the Triton X-100. Fixative 2. mix 150ul dH2O, 250 ul Glacial Acetic Acid, and 100 ul of 5X formaldehyde stock. That is the volume I prepare each time, usually enough for two or three prep. You need to prepare 5X formaldehyde stock first and this stock you can keep in -20C for a long time. However the Fix1 and Fix2 you need to prepare freshly. If you have any question you can send me another e-mail. Thanks!
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This may be a dumb question but when you put the tissue in Fixative 1 the Triton will lyse the membrane(s), correct? What keeps you from losing the chromosomes in either Fixative 1 and/or Fixative 2? Is it the PFA? The reason I ask is because I have followed your protocol and I see ALOT of tissue that resemble lysed cells (i.e. rounded edges with "tear" spots at various locations); however, I obtain very few polytene chromosomes? My thought is that they may be getting flushed out during my transfers. Do you have any advice? Thanks!
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You are right about the Triton. If you leave the glands in too long they will fall apart. The trick is to leave them in just long enough. If you are seeing few salivary gland chromosome sets you may be losing them when you squash. When you put them on the coverslip and then pick up the coverslip with the slide the chromosomes may float away to the edges of the cover slip if there is too much liquid present. Try placing them on the coverslip in a smaller drop of liquid and being careful about how you apply the pressure when you squash. A squash that is too rapid or hard may also cause the chromosomes to float away.
can you please send me the protocal
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ReplyPosted by: monaApril 21, 2010, 4:46 AM