Cl− extrusion capacity measurements from in utero electroporated cortical neurons reveal impaired Cl− extrusion by KCC2‐R952H IUE of EGFP and either KCC2‐WT.

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Cl− extrusion capacity measurements from in utero electroporated cortical neurons reveal impaired Cl− extrusion by KCC2‐R952H IUE of EGFP and either KCC2‐WT or KCC2‐R952H at embryonic day 14.5 targets mouse cortical layer 2/3 pyramidal neurons (analysis at postnatal day (P) 6). Cl− extrusion capacity measurements from in utero electroporated cortical neurons reveal impaired Cl− extrusion by KCC2‐R952H IUE of EGFP and either KCC2‐WT or KCC2‐R952H at embryonic day 14.5 targets mouse cortical layer 2/3 pyramidal neurons (analysis at postnatal day (P) 6). Transfected neurons co‐express either of the KCC2 constructs (red) with EGFP, while endogenous mKCC2 levels in non‐transfected neurons at this age are low. Scale bars: 100 μm and 20 μm (insets). Whole‐cell patch clamp recordings of GABA uncaging‐elicited GABAA‐mediated currents (IGABA) in transfected cortical layer 2/3 pyramidal neurons with a somatically imposed Cl− load. Sample EGABA recordings and corresponding I‐V curves at the soma and dendrite. Horizontal bars in the sample traces indicate the duration of the uncaging UV‐flash. Cl− extrusion capacity of P6‐7 cortical pyramidal neurons expressing EGFP (n = 8), KCC2‐WT (n = 15), KCC2‐R952H (n = 16) or rKCC2‐ΔNTD (n = 8) was quantified as the somatodendritic EGABA gradient (ΔEGABA = EGABA‐soma − EGABA‐dendrite). EGFP‐negative neurons (n = 17) served as controls. Statistical analysis was performed using one‐way ANOVA with Holm–Sidak post hoc test. *P < 0.05; **P < 0.01. Error bars represent SEM. Martin Puskarjov et al. EMBO Rep. 2014;embr.201438749 © as stated in the article, figure or figure legend