Báo cáo khoa học: Molecular cloning and functional expression of the human sodium channel b1B subunit, a novel splicing variant of the b1 subunit

Molecular cloning and functional expression of the human sodium channel ẞ1B subunit, a novel splicing variant of the ẞ₁ subunit

Authors: Ning Qin, Michael R. D’Andrea, Mary-Lou Lubin, Navid Shafaee, Ellen E. Codd, and Ana M. Correa

Field: Pharmacology / Neuroscience

Document Content: This study details the identification and characterization of a novel splicing variant of the human sodium channel beta-1 (β₁) subunit, designated as β1B. The research describes the molecular cloning, sequence analysis, tissue distribution, and functional expression of this new subunit. The β1B subunit shares an identical N-terminal half with the human β₁ subunit but possesses a distinct C-terminal half. Functional studies in Xenopus oocytes indicate that the human β1B subunit enhances ionic current when coexpressed with the tetrodotoxin-sensitive channel Nay1.2, without significantly altering voltage-dependent kinetics. This finding distinguishes it from the human β₁ and rat β1A subunits. The study also explores the genomic organization and tissue expression patterns of the β1B subunit, suggesting its potential role in regulating sodium channel function, particularly in response to nerve injury.

Detailed Table of Contents:

• Molecular cloning and functional expression of the human sodium channel β1B subunit, a novel splicing variant of the β₁ subunit
• Keywords: sodium channel; β1B subunit; splicing variant
• Experimental procedures
• Molecular cloning of the human sodium channel β1B subunit
• Generation of polyclonal antibody
• Northern blot analysis
• Immunohistochemistry
• In vitro synthesis of cRNA
• Oocyte preparation and RNA injection
• Recording solutions
• Recording and analysis of macroscopic ionic and gating currents
• Results
• Cloning and analysis of the human VGSC β1B subunit
• Tissue distribution of the human β1B subunit
• Functional expression of the human β1B subunit with Nay1.2 in Xenopus oocytes
• Discussion
• References