PT - JOURNAL ARTICLE AU - Christopher A. Miller AU - Jason R. Walker AU - Travis L. Jensen AU - William F. Hooper AU - Robert S. Fulton AU - Jeffrey S. Painter AU - Mikkael A. Sekeres AU - Timothy J. Ley AU - David H Spencer AU - Johannes B. Goll AU - Matthew J. Walter TI - Failure to detect mutations in <em>U2AF1</em> due to changes in the GRCh38 reference sequence AID - 10.1101/2021.05.07.442430 DP - 2021 Jan 01 TA - bioRxiv PG - 2021.05.07.442430 4099 - http://biorxiv.org/content/early/2021/05/08/2021.05.07.442430.short 4100 - http://biorxiv.org/content/early/2021/05/08/2021.05.07.442430.full AB - The U2AF1 gene is a core part of mRNA splicing machinery and frequently contains somatic mutations that contribute to oncogenesis in MDS, AML, and other cancers. A change introduced in the GRCh38 version of the human reference build prevents mutations in this gene from being detected by many variant calling pipelines. We describe the problem in detail and show that a modified GRCh38 reference build with unchanged coordinates can be used to ameliorate the issue. This reference is available at https://zenodo.org/record/4684553 (doi:10.5281/zenodo.4684553)Competing Interest StatementThe authors have declared no competing interest.