UO Lockery Lab
Tight-seal whole-cell patch clamping of C. elegans neurons: erratum (October,2000)

We regret to inform the C. elegans community that the published recipe for internal (in-pipette) saline for whole-cell recordings[1,2] from neurons was incorrect. The published recipe was (in mM):

KGluconate 125, KCl 18, NaCl 0, CaCl2 0.7, MgCl2 1, HEPES 10, EGTA 10.

The recipe actually used was (in mM):

KGluconate 125, KCl 18, NaCl 4, CaCl2 0.6, MgCl2 2, HEPES 10, EGTA 10.

The main effect of this error resides in the difference in NaCl concentration. The correct saline will produce a predicted Na reversal potential of 90 mV with the published external saline, while the erroneous published saline has an undefined ENa. Because C. elegans lacks voltage-gated Na channels, this difference in salines may have little or no effect on recordings of voltage-gated currents. It may, however, affect measurements of currents carried by ligand-gated currents and currents carried by DEG/ENaC channels. We apologize for any inconvenience this error may have caused.

1. Goodman, M.B., Hall, D.H., Avery, L., and Lockery, S.R. (1998) Active Currents Regulate Sensitivity and Dynamic Range in C. elegans Neurons. Neuron 20:763-772.

2. Lockery, S.R. and Goodman, M.B. (1998) Tight-seal whole-cell patch clamping of C. elegans neurons. Methods in Enzymology 295:201-217.

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