In vivo PAR-CLIP (viP-CLIP) of liver TIAL1 unveils targets regulating cholesterol synthesis and secretion

Hasan Vatandaslar, Aitor Garzia, Cindy Meyer, Svenja Godbersen, Laura T. L. Brandt, Esther Griesbach, Jeffrey A. Chao, Thomas Tuschl and Markus Stoffel ()
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Hasan Vatandaslar: ETH Zurich
Aitor Garzia: The Rockefeller University
Cindy Meyer: The Rockefeller University
Svenja Godbersen: ETH Zurich
Laura T. L. Brandt: ETH Zurich
Esther Griesbach: Friedrich Miescher Institute for Biomedical Research
Jeffrey A. Chao: Friedrich Miescher Institute for Biomedical Research
Thomas Tuschl: The Rockefeller University
Markus Stoffel: ETH Zurich

Nature Communications, 2023, vol. 14, issue 1, 1-17

Abstract: Abstract System-wide cross-linking and immunoprecipitation (CLIP) approaches have unveiled regulatory mechanisms of RNA-binding proteins (RBPs) mainly in cultured cells due to limitations in the cross-linking efficiency of tissues. Here, we describe viP-CLIP (in vivo PAR-CLIP), a method capable of identifying RBP targets in mammalian tissues, thereby facilitating the functional analysis of RBP-regulatory networks in vivo. We applied viP-CLIP to mouse livers and identified Insig2 and ApoB as prominent TIAL1 target transcripts, indicating an important role of TIAL1 in cholesterol synthesis and secretion. The functional relevance of these targets was confirmed by showing that TIAL1 influences their translation in hepatocytes. Mutant Tial1 mice exhibit altered cholesterol synthesis, APOB secretion and plasma cholesterol levels. Our results demonstrate that viP-CLIP can identify physiologically relevant RBP targets by finding a factor implicated in the negative feedback regulation of cholesterol biosynthesis.

Date: 2023
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DOI: 10.1038/s41467-023-39135-8

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