Total RNA isolated from tissues microdissected from C57Bl6/N embryos at E12 – P2 was subjected to scgn expression analysis after confirming RNA integrity (Supporting Information, Fig. S1A). Quantitative real-time PCR (qPCR) reactions were validated by preliminary testing of amplification efficacy and by excluding the possibility of genomic DNA contamination in the presence (+) or absence (−) of reverse transcriptase in parallel

and running the samples on 1.5% agarose gel (supporting Fig. S1A1). qPCR reactions were performed with custom-designed primers for scgn (supporting Fig. S1A2–A4; Mulder et al., 2009b). TATA binding protein Bortezomib mw (forward primer, 5′-ACCCTTCACCAATGACTCCTATG-3′; reverse primer, 5′-ATGACTGCAGCAAATCGCTTGG-3′) was used

to normalize scgn expression. Protein samples were analyzed under denaturing conditions. After electrophoresis, proteins were transferred onto Immobilon-FL PVDF membranes (Millipore, Billerica, MA, USA) and probed with rabbit anti-scgn (1 : 2000) and mouse anti-β-actin PD0325901 price (1 : 4000) primary antibodies (Mulder et al., 2009b). Immunoreactivities were revealed using IRDye680 and IRDye800 secondary antibodies (Invitrogen/Molecular Probes, Paisley, UK). Blots were scanned on a Li-Cor Odyssey-IR imager (Li-Cor Biosciences, Lincoln, NA, USA). Within the framework of the Human Protein Atlas program (http://www.proteinatlas.org), a rabbit antibody against a recombinant fragment of human scgn [amino acids (AA) out 135-273] was generated (Mulder et al., 2009a). The specificity of the ensuing anti-scgn antibody has been extensively evaluated (Mulder et al., 2009b) in accordance with existing guidelines on the application of primary antibodies (Fritschy, 2008). We have further validated our novel anti-scgn antibody by comparing its labelling pattern with that of a commercial polyclonal

anti-scgn antibody raised in goat against scgn’s AA164-276 fragment (R & D Systems, Minneapolis, MN, USA; supporting Fig. S2A) by both Western blotting (supporting Fig. S2B) and histochemistry (supporting Fig. S2C). We find that these antibodies unequivocally recognize a major protein band corresponding to scgn’s calculated molecular weight in Western applications (supporting Fig. S2B), and reveal the same neuron populations in E15 mouse forebrain (Fig. 3 and supporting Fig. S2C). Furthermore, our anti-scgn antibody produces a staining pattern in the olfactory bulb that is indistinguishable from that of a polyclonal anti-scgn antibody generated against the complete human scgn sequence (Wagner et al., 2000) (J. Attems & L. Wagner, personal communication). Multiple immunofluorescence histochemistry with cocktails of primary antibodies (Table 1) was performed in both species studied (Mulder et al., 2009b).