title: Differentially expressed genes in the rat cochlear nucleus.
abstract: The cochlear nucleus is the first central pathway involved in the processing of peripheral auditory activity. The anterior ventral cochlear nucleus (AVCN), posterior ventral cochlear nucleus (PVCN) and dorsal cochlear nucleus (DCN) each contain predominant populations of neurons that have been well characterized regarding their morphological and electrophysiological properties. Little is known, however, of the underlying genetic factors that contribute to these properties and the initial steps in auditory processing. Serial analysis of gene expression (SAGE), supported by microarray experiments, was performed on each subdivision of the rat cochlear nucleus to identify genes that may sub-serve specialized roles in the central auditory system. Pair-wise comparisons between SAGE libraries from the AVCN, PVCN and DCN were correlated with microarray experiments to identify individual transcripts with significant differential expression. Twelve highly correlated genes were identified representing cytoskeletal, vesicular, metabolic and g-protein regulating proteins. Among these were Rgs4 which showed higher expression in the DCN, Sst and Cyp11b1 with very high expression in the AVCN and Calb2 with preferential expression in the PVCN. The differential expression of these genes was validated with real-time reverse transcriptase-polymerase chain reaction. These experiments provide a basis for understanding normal auditory processing on a molecular level and a template for investigating changes that may occur in the cochlear nucleus with hearing loss, the generation and percept of tinnitus, and central auditory processing disorders.
authors.affiliation: Department of Otolaryngology and Communication Sciences, Medical College of Wisconsin, 9200 West Wisconsin Avenue, Milwaukee, WI 53226, USA. dfriedla@mcw.edu
authors.forename: D R
authors.initials: DR
authors.lastname: Friedland
authors.forename: P
authors.initials: P
authors.lastname: Popper
authors.forename: R
authors.initials: R
authors.lastname: Eernisse
authors.forename: J A
authors.initials: JA
authors.lastname: Cioffi
mesh_terms: D000818:Animals; D064032:Calbindin 2; D017626:Cochlear Nucleus / Q000033:anatomy & histology / Q000502:physiology*; D005260:Female; D015870:Gene Expression / Q000502:physiology*; D020869:Gene Expression Profiling / Q000379:methods; D015723:Gene Library; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods; D020710:RGS Proteins / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D064030:S100 Calcium Binding Protein G / Q000235:genetics / Q000378:metabolism; D013252:Steroid 11-beta-Hydroxylase / Q000235:genetics / Q000378:metabolism
chemical_list: C576512:Calb2 protein, rat; D064032:Calbindin 2; D020710:RGS Proteins; D012333:RNA, Messenger; D064030:S100 Calcium Binding Protein G; C098799:RGS4 protein; D013252:Steroid 11-beta-Hydroxylase