A Novel Family of Putative Pheromone Receptors in Mammals with a Topographically Organized and Sexually Dimorphic Distribution  Gilles Herrada, Catherine.

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A Novel Family of Putative Pheromone Receptors in Mammals with a Topographically Organized and Sexually Dimorphic Distribution  Gilles Herrada, Catherine Dulac  Cell  Volume 90, Issue 4, Pages 763-773 (August 1997) DOI: 10.1016/S0092-8674(00)80536-X

Figure 1 Anatomical Organization of the VNO and the Main Olfactory System (A) Drawing of a parasagittal section of an adult rat head. Neurons from the main olfactory epithelium (MOE) project to the olfactory bulb (OB). VNO neurons are segregated into two neuronal populations distinguished by differential expression of the G-protein subunits Gαi2 (indicated by green color) and Go (indicated by red color) and are likely to project to different areas of the accessory olfactory bulb (AOB). (B) Schematic representation of VNO and MOE axonal projections. In the bulb, MOE and VNO axons form neuropils called glomeruli where they synapse with mitral cells. OB and AOB mitral cells project to distinct centers of the brain. aot, accessory olfactory tract; lot, lateral olfactory tract. Cell 1997 90, 763-773DOI: (10.1016/S0092-8674(00)80536-X)

Figure 2 Identification of a Novel Receptor Gene Family Specifically Expressed by VNO Neurons Coexpressing the G Protein Go (A–D) Coronal sections of VNOs dissected from adult male rats were hybridized with antisense RNA probes for G protein Go (A), G protein Gαi2 (C), a mix of pheromone receptor probes (Gαi2-VN) expressed by Gαi2+ neurons (D), and the cDNA Go-VN13b identified by differential screening of a cDNA library prepared from an isolated VNO neuron (B). (E) Rat genomic DNA was digested with EcoR1 (a) and BamH1 (b) and analyzed on Southern blots after hybridization with Go-VN13a (1) and Go-VN13b (2 and 3) probes under conditions of high stringency (1 and 2) and low stringency (3). Cell 1997 90, 763-773DOI: (10.1016/S0092-8674(00)80536-X)

Figure 3 Amino Acid Sequences of cDNAs from the Go-VN Family of Pheromone Receptors The deduced amino acid sequences of eight cDNAs belonging to the Go-VN family of putative pheromone receptors. Predicted position of seven transmembrane domains is indicated (I–VII). Amino acids common to at least five cDNAs are shaded. Amino acids common to the rat mGluR1 and Ca2+-sensing receptors are indicated by a star. Cell 1997 90, 763-773DOI: (10.1016/S0092-8674(00)80536-X)

Figure 4 Southern Blot Analysis with Divergent Subfamilies of Go-VN Receptors Rat genomic DNA was digested with EcoR1 (a and a′) and BamH1 (b and b′) and analyzed by Southern blots after hybridization with 32P-labeled probes corresponding to five divergent Go-VN cDNAs (1, Go-VN1; 2, Go-VN2; 3–5, Go-VN4 to Go-VN6) under conditions of high (a and b) and low stringency (a′ and b′). Cell 1997 90, 763-773DOI: (10.1016/S0092-8674(00)80536-X)

Figure 5 Expression and Localization of Go-VN Receptor Transcripts in Coronal Sections of Adult Rat VNO Cross-sections of VNO dissected from male or female adult rats were hybridized to digoxigenin-labeled antisense RNA probes under high and low (LS) conditions of stringency. Individual cDNA clones encoding for Go-VN1 to Go-VN6 and a mix of Go-VN1 to Go-VN6 cDNAs were used as templates. Scale bar = 120 μm. Cell 1997 90, 763-773DOI: (10.1016/S0092-8674(00)80536-X)

Figure 6 Analysis of the Spatial Distribution of Go-VN1 to Go-VN6 along the Basal–Apical Axis in Adult Rat VNOs The basal–apical axis of each VNO section was divided into ten hemiconcentric rings of increasing diameters. Each point of the curve represents an average number of labeled cells per discrete zone after counting six to eight sections originating from four independent animals analyzed during two independent experiments. For Go-VN2, 14 sections corresponding to ten individuals and four independent experiments were analyzed for each sex. Cell 1997 90, 763-773DOI: (10.1016/S0092-8674(00)80536-X)

Figure 7 Spatial Distribution of VNO Sensory Neurons Expressing Go, Gαi2, Go-VN, and Gαi2-VN Receptors in Young Animals In situ hybridization was performed on cross-sections through the head of 1-week-old rats. Antisense digoxigenin-labeled RNA probes were generated from cDNA encoding Go, Gαi2, and mix or Go-VN and Gαi2-VN receptors. Scale bar = 120 μm. Cell 1997 90, 763-773DOI: (10.1016/S0092-8674(00)80536-X)