What correlations did they find when assessing ASBT protein, ASBT mRNA, and histopath grade?

• A. Positive correlation between ASBT protein and mRNA; cumulative histopath score in ileum negatively correlated with ASBT protein
• B. Positive correlations between ASBT protein and histopath score; mRNA with DI
• C. Negative correlation between ASBT protein and mRNA; histopath score positively correlated with ASBT protein
• D. No correlation between ASBT protein and mRNA; histopath score unrelated to ASBT protein

Answer: (C)

The idea is to understand how gene expression at the mRNA level, the actual protein amount, and tissue injury relate to each other. A negative correlation between ASBT protein and ASBT mRNA means that higher mRNA levels do not translate into higher protein levels; in fact, they move in opposite directions. This points to post-transcriptional regulation or increased protein turnover that decouples transcription from the final protein abundance.

At the same time, a positive correlation between histopath grade and ASBT protein indicates that as the tissue shows more severe histologic changes, the amount of ASBT protein detected rises. This suggests that the inflammatory or injury environment is associated with more ASBT protein, perhaps through pathways that boost translation or retention of the protein, or through changes in the cellular sources of ASBT.

Together, these patterns—mRNA and protein moving in opposite directions, and protein increasing with greater histologic damage—fit the described results. The other patterns would imply more straightforward, parallel relationships that aren’t observed here.