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        Whole mount TUNEL analysis of Xenopus embryos

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        Fixation and pretreatment

        Dejelly albino embryos carefully in 2% Cystein (pH 7.8).

        Remove the vitellin membrane with two pairs of tweezers
                (or carefully pierce multiple times after fixation)

        Fix the embryos in MEMPFA for 1 hour at room temperature
                (MEMPFA: 100 mM MOPS pH 7.4, 2 mM EGTA, 1 mM MgSO4 , 4% paraformaldehyde)

        Wash 2 times 30 minutes in methanol, store in methanol at -20 °C.

        Wash embryos 2 times 15 minutes at room temperature in PBT
                (0.2% Tween in phosphate buffered saline (PBS))

        Wash embryos 2 times 15 minutes at room temperature in PBS
         

        End labelling

        Wash embryos 30 min. in TdT buffer (Gibco) 1 hr. at room temp.

        Incubate embryos overnight at room temp., in TdT buffer containing
                0.5 µM digoxygenin-dUTP (Boehringer) and
                150 U/ml TdT (Gibco).

        Wash 2 x 1 hr. with PBS/EDTA (1 mM), at 65°C

        Wash 4 x 1 hr. with PBS at room temp.
         

        Detection and chromogenic reaction

        As for in situ hybridization, see:

        Harland,R.M. (1991) In Kay,B.K. and Peng,H.B. (eds.), In situ hybridization: An improved whole mount method for Xenopus embryos , vol. 36. Academic Press Inc., San Diego, pp. 685-695.

         

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