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. 2022 Feb 17;13:958. doi: 10.1038/s41467-022-28636-7

Fig. 10. Kdm6b acts as a coactivator of Isl1-Lhx3.

Fig. 10

Kdm6b is associated with Lhx3 (a) or Isl1-Lhx3 (b) in co-immunoprecipitation assays in HEK293 cells. HEK293 cells were transfected with the constructs indicated on the left of the immunoblotting results. Antibodies used for immunoprecipitation were noted on the top. HA or Flag antibodies were used for immunoblotting assays, as shown on the right. The assays were performed three times in each condition and the representative results were shown. c Luciferase reporter assays in HEK293 cells transfected with HxRE:LUC or control LUC vector with (+) or without (−) Isl1-Lhx3, Kdm6b or Kdm6a, as indicated on the graph. Kdm6b enhanced Isl1-Lhx3-mediated transcriptional activity in a dose-dependent manner. n = 3 biologically independent samples. Error bars represent the standard deviation of the mean. d ChIP assays in E12.5 spinal cords with IgG or Kdm6b antibody. Kdm6b was recruited to the Isl1-Lhx3 binding loci in Mnx1, Isl1, and Lhx4 genes. The Untr6 was used as a negative control region. n = 3 biologically independent samples. Error bars represent the standard deviation of the mean. e The model depicts Kdm6b action in the development of spinal MNs. Kdm6b is recruited to the Isl1-Lhx3-binding hexamer response element (HxRE) by associating with Isl1-Lhx3 complex and activates the Isl1-Lhx3 target genes, including Isl1/2, Lhx3/4, and Mnx1 genes. This transcriptional activation promotes nbMN and MMC fates, in part by further enhancing Isl1-Lhx3 activity. Moreover, as Lhx3 inhibits Foxp1 expression, Kdm6b-mediated transcriptional activation indirectly suppresses LMC and PGC fates. Thus, Kdm6b controls the balanced production of MN subtypes.