Ribosomal profiling (Ribo-seq) was performed using the
ARTseq-TM Ribosome Profiling kit from Illumina (#RPHMR12126, Illumina) according to the manufacturer's instructions [30 (
link)]. For final amplification of the library, 12 PCR cycles were run with subsequent library purification. The quality and quantity of the samples were determined using a
Fragment Analyzer (Advanced Analytical Technologies).
Reads were mapped against the human genome (hg38) using STAR [69 (
link)] and processed based on annotations from Ensembl (v86). A generative model was fitted to the observed positions of annotated codons in strongly translated ORFs. Translated ORFs were determined and each ORF was quantified using the number of reads mapped to its codons.
For corresponding RNA-sequencing analysis, reads were mapped against the human genome (hg38) using STAR. Then, reads per gene were counted when they were consistent with at least one transcript annotated in Ensembl v86.
Schmidt S., Gay D., Uthe F.W., Denk S., Paauwe M., Matthes N., Diefenbacher M.E., Bryson S., Warrander F.C., Erhard F., Ade C.P., Baluapuri A., Walz S., Jackstadt R., Ford C., Vlachogiannis G., Valeri N., Otto C., Schülein-Völk C., Maurus K., Schmitz W., Knight J.R., Wolf E., Strathdee D., Schulze A., Germer C.T., Rosenwald A., Sansom O.J., Eilers M, & Wiegering A. (2019). A MYC/GCN2/eIF2α negative feedback loop limits protein synthesis to prevent MYC-dependent apoptosis in colorectal cancer. Nature cell biology, 21(11), 1413-1424.