TY - JOUR A1 - Schneider, Valerie A. A1 - Graves-Lindsay, Tina A1 - Howe, Kerstin A1 - Bouk, Nathan A1 - Chen, Hsiu-Chuan A1 - Kitts, Paul A. A1 - Murphy, Terence D. A1 - Pruitt, Kim D. A1 - Thibaud-Nissen, Françoise A1 - Albracht, Derek A1 - Fulton, Robert S. A1 - Kremitzki, Milinn A1 - Magrini, Vincent A1 - Markovic, Chris A1 - McGrath, Sean A1 - Steinberg, Karyn Meltz A1 - Auger, Kate A1 - Chow, William A1 - Collins, Joanna A1 - Harden, Glenn A1 - Hubbard, Timothy A1 - Pelan, Sarah A1 - Simpson, Jared T. A1 - Threadgold, Glen A1 - Torrance, James A1 - Wood, Jonathan M. A1 - Clarke, Laura A1 - Koren, Sergey A1 - Boitano, Matthew A1 - Peluso, Paul A1 - Li, Heng A1 - Chin, Chen-Shan A1 - Phillippy, Adam M. A1 - Durbin, Richard A1 - Wilson, Richard K. A1 - Flicek, Paul A1 - Eichler, Evan E. A1 - Church, Deanna M. T1 - Evaluation of GRCh38 and de novo haploid genome assemblies demonstrates the enduring quality of the reference assembly Y1 - 2017/05/01 JF - Genome Research JO - Genome Research SP - 849 EP - 864 DO - 10.1101/gr.213611.116 VL - 27 IS - 5 UR - http://genome.cshlp.org/content/27/5/849.abstract N2 - The human reference genome assembly plays a central role in nearly all aspects of today's basic and clinical research. GRCh38 is the first coordinate-changing assembly update since 2009; it reflects the resolution of roughly 1000 issues and encompasses modifications ranging from thousands of single base changes to megabase-scale path reorganizations, gap closures, and localization of previously orphaned sequences. We developed a new approach to sequence generation for targeted base updates and used data from new genome mapping technologies and single haplotype resources to identify and resolve larger assembly issues. For the first time, the reference assembly contains sequence-based representations for the centromeres. We also expanded the number of alternate loci to create a reference that provides a more robust representation of human population variation. We demonstrate that the updates render the reference an improved annotation substrate, alter read alignments in unchanged regions, and impact variant interpretation at clinically relevant loci. We additionally evaluated a collection of new de novo long-read haploid assemblies and conclude that although the new assemblies compare favorably to the reference with respect to continuity, error rate, and gene completeness, the reference still provides the best representation for complex genomic regions and coding sequences. We assert that the collected updates in GRCh38 make the newer assembly a more robust substrate for comprehensive analyses that will promote our understanding of human biology and advance our efforts to improve health. ER -