Cai Y, Saiyin H, Lin Q, Zhang P, Tang L, Pan X, Yu L. Identification of a new RTN3 transcript, RTN3-A1, and its distribution in adult mouse brain.
ACTA ACUST UNITED AC 2005;
138:236-43. [PMID:
15946766 DOI:
10.1016/j.molbrainres.2005.04.020]
[Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2004] [Revised: 03/15/2005] [Accepted: 04/18/2005] [Indexed: 10/25/2022]
Abstract
The Reticulon (RTN) family of proteins is thought to play important roles in the regulation of neuronal regeneration. In this study, we have identified a novel alternative splicing isoform of the RTN gene family, RTN3-A1, which contains an additional 2.3-kb exon. The transcripts of human and mouse RTN3-A1 (about 5.0 kb) were first discovered by database sequence mining and analysis, and verified by cloning and sequencing. Northern blot analysis of 16 human tissues with a common probe of RTN3 transcripts and a specific probe for RTN3-A1 demonstrated that human RTN3-A1 is expressed mainly in brain tissues with a weak expression in the skeletal muscle. With Western blot analysis, the expected 100-kDa RTN3-A1 protein was detected in mouse brain. In situ hybridization with a mouse RTN3-A1-specific cRNA probe revealed that the mouse RTN3-A1 mRNA was regionally expressed in the neurons of the cerebral cortex, hippocampus, hypothalamus, and cerebellum of the adult mouse brain. In contrast to the transcripts of RTN1 and RTN2, RTN3-A1 shares some significant similarity with RTN4-A in exon structure, tissue distribution, and brain expression profile. Since other reports have shown that RTN4-A inhibits neuronal outgrowth and restricts the plasticity of the central nervous system, we speculate that RTN3-A1 might play certain roles in the central nervous system.
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