96-well plate fluorescent in situ hybridization (FISH)

1st Day
  1. Mass isolated egg-chambers were transferred stepwise into PBT0.1% (each wash few minutes):
    1. MeOH/PBT 3:1
    2. MeOH/PBS 1:1
    3. MeOH/PBS 1:3

  2. Egg-chambers were then washed 6x in PBT0.1%, 5 minutes each

  3. Egg-chambers were briefly washed in PBT0.1%/Hyb 1:1

  4. Pre-Hybridization of egg-chambers was done in 200µl hybridization buffer at 55°C for 1 hour.

  5. Egg-chambers were then added to a 96-well plate and hybridized over-night at 55°C in Hybridization Buffer with Dextran Sulfate supplemented with 2µl of probe.

    6. 2nd Day

  6. 100µl of warm Wash Buffer was added to each well and immediately removed together with probe-solution.

  7. Egg-chambers were rinsed once with 150µl of Wash Buffer and then washed four times for one hour at 55°C in Wash Buffer.

  8. Egg-chambers were then washed five times for 1hr at 55°C in 150µl PBT, the last wash was done over-night at 55°C.

    9. 3rd Day

  9. Egg-chambers were washed twice for 1hr at room temperature in 150µl PBT.

  10. The primary antibody (Anti-Digoxigenin-POD Fab Fragments (Roche)was diluted 1:200 and egg-chambers were incubated in 200µl antibody solution over-night.

    11. 4th Day

  11. Egg-chambers were rinsed with 150µl of PBT and then washed ten times for 30min at RT in 150µl of PBT0.1%.

  12. For detection egg-chambers were incubated with Cy3-Tyramides (Perkin-Elmer) 1:70 diluted in amplification buffer for 30 minutes.

  13. Egg-chambers were then washed ten times for 30min at room temperature in 150µl of PBT. DAPI, diluted 1:1000, was included in one wash step.

  14. All PBT was removed and ~50µl mounting medium (100% glycerol with 2% N-propyl-gallate) was added.

Solutions and Buffers

PBS: NaCl 8g, KCl 0,2g, KH2PO4 0,24g, Na2HPO4.7H2O 2,72g. Dissolve in 0,8l DEPC H2O, adjust pH to 7,4 with HCl and adjust volume to 1l.

PBT0.1%: Add 1ml Tween-20 to PBS.

20xSSC: NaCl 87,7g, Sodium Citrate 44,1g. Dissolve in 0,4l H2O, adjust pH to 7,0 with 10N NaOH and adjust volume to 0.5l.

Hybridization Buffer: H2O 150ml, Formamide 250ml, 20x SSC 100ml, Tween 20 0,5ml. Total 500ml.

Hybridization Buffer with Dextran Sulfate: H2O 100ml, Formamide 250ml, 20x SSC 100ml, Tween 20 0,5ml, 50% Dextran Sulfate 50ml. Total 500. For dextrane sulfate: prepare 100g of dextran sulfate in DEPC H2O and adjust volume to 200ml. Store at 4°C.

Wash Buffer: H2O 200ml, Formamide 250ml, 20x SSC 50ml, Tween 20 0,5ml. Total 500