Which objective included characterizing ASBT mRNA and protein distribution along the canine GI tract?

• A. Characterize ASBT mRNA and protein distribution along the canine GI tract
• B. Compare ASBT expression between CIE and control dogs
• C. Investigate associations between ASBT expression and fecal dysbiosis index
• D. Assess liver enzyme levels in healthy dogs

Answer: (A)

Characterizing ASBT mRNA and protein distribution along the canine GI tract focuses on mapping where this transporter is present and at what levels across different gut segments, using measurements of both RNA and protein. This approach directly answers how ASBT is spatially expressed along the tract, which regions express it and to what extent, providing a layout of its physiological role in bile acid reabsorption. Typically, researchers would sample multiple GI regions (from stomach through colon) and assess mRNA levels (e.g., qPCR) and protein localization or abundance (e.g., immunohistochemistry, Western blot) to create a segment-by-segment expression map. Other objectives that aim to compare diseased and healthy animals, link expression to fecal dysbiosis indices, or measure unrelated liver enzymes do not specifically describe the spatial distribution of ASBT along the GI tract.