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Background  Although originally identified as embryonic axon guidance cues, semaphorins are now known to regulate multiple, distinct, processes crucial for neuronal network formation including axon growth and branching, dendritic morphology, and neuronal migration. Semaphorin7A (Sema7A), the only glycosylphosphatidylinositol-anchored semaphorin, promotes axon growth in vitro and is required for the proper growth of the mouse lateral olfactory tract in vivo. Sema7A has been postulated to signal through two unrelated receptors, an RGD-dependent α1β1-integrin and a member of the plexin family, plexinC1. β1-integrins underlie Sema7A-mediated axon growth and Sema7A function in the immune system. Sema7A-plexinC1 interactions have also been implicated in immune system function, but the neuronal role of this ligand-receptor pair remains to be explored. To gain further insight into the function(s) of Sema7A and plexinC1 during neural development, we present here a detailed analysis of  Sema7A  and  plexinC1  expression in the developing rat nervous system.    Results  In situ hybridization revealed select expression of  Sema7A  and  plexinC1  in multiple neuronal systems including: the olfactory system, the hypothalamo-hypophysial system, the hippocampus, the meso-diencephalic dopamine system, and the spinal cord. Within these systems,  Sema7A  and  plexinC1  are often expressed in specific neuronal subsets. In general,  Sema7A  transcript levels increase significantly towards adulthood, whereas  plexinC1  expression decreases as development proceeds.   PlexinC1 , but not  Sema7A , is strongly expressed by distinct populations of migrating neurons. In addition to neuronal expression,  Sema7A  and  plexinC1  transcripts were detected in oligodendrocytes and ependymal cells, respectively.    Conclusion   Sema7A  and  plexinC1  expression patterns are consistent with these proteins serving both cooperative and separate functions during neural development. The prominent expression of  plexinC1  in several distinct populations of migrating neurons suggests a novel role for this plexin family member in neuronal migration.

Expression patterns of semaphorin7A and plexinC1during rat neural development suggest roles in axon guidance and neuronal migration