Fig 2: KO of Cc2d1b does not alter developmental myelination in the PNS. (A,B) Single cells RNA-seq–based gene expression values (RPKM) of Cc2d1b in myelinating Schwann cells (mySC), non-myelinating Schwann cells (nmSC), and all Schwann cells (allSC; Gerber et al., 2021). Schwann cells were isolated from mouse sciatic nerve embryonic day 13.5 (E13.5), E17.5, P1, P5, P14, P24, P60 (Gerber et al., 2021). (C) Western blot analysis shows that CC2D1B protein levels are decreased in sciatic nerves of Cc2d1b KO mice at 30 days of age. CC2D1A protein levels are not affected by the absence of CC2D1B. Calnexin was used as a protein loading control. (D) Myelination in Cc2d1b KO mice. Semithin analysis of control and Cc2d1b KO sciatic nerves at P10, P20, and P60. The thickness of myelin (g ratio) was measured. n = 3–5 mice for each genotype. (E) Measurements of compound muscle action potential amplitude from Cc2d1b KO animals at P60. n = 6 nerves for each genotype. (F) Measurements of nerve conduction velocity (NCV) from Cc2d1b KO animals at P60. n = 6 nerves for each genotype. Data are represented as mean ± s.e.m. Scale bars 10 µm.

Fig 3: Myelin protein level and OLIG2-positive cell number are not affected in Cc2d1b KOCNS. (A) Representative coronal sections of brain tissue immunostained for MBP and OLIG2 collected from adult Cc2d1b KO animals, at 30 days of age. Scale bar, 200 µm. (B) Integrated fluorescence intensity for MBP, MOG, and PLP1 and the number of OLIG2-positive cells were quantified in the lateral corpus callosum (CC), the cingulate cortex (CX), and striatum (ST). (C) Representative cross sections of optic nerve immunostained for OLIG2 and KI67 collected from adult Cc2d1b KO animals, at 30 days of age. Scale bar, 50 µm. (D) Integrated fluorescence intensity for PLP1, and the number of OLIG2-positive and KI67-positive cells were quantified in the optic nerves. n = 3–4 mice for genotype. Data are presented as mean ± s.e.m.