RT Journal Article
SR Electronic
T1 Genome diversification, deleterious mutation accumulation, and evidence of negative selection among clonally propagated grapevines
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 585869
DO 10.1101/585869
A1 Amanda M. Vondras
A1 Andrea Minio
A1 Barbara Blanco-Ulate
A1 Rosa Figueroa-Balderas
A1 Michael A. Penn
A1 Yongfeng Zhou
A1 Danelle Seymour
A1 Ye Zhou
A1 Dingren Liang
A1 Lucero K. Espinoza
A1 Michael M. Anderson
A1 M. Andrew Walker
A1 Brandon Gaut
A1 Dario Cantu
YR 2019
UL http://biorxiv.org/content/early/2019/04/17/585869.abstract
AB Vegetatively propagated clones accumulate somatic mutations. The purpose of this study was to better understand the consequences of clonal propagation and involved defining the nature of somatic mutations throughout the genome.Sixteen Zinfandel winegrape clone genomes were sequenced and compared to one another using a highly contiguous genome reference produced from one of the clones, Zinfandel 03.Though most heterozygous variants were shared, somatic mutations accumulated in individual and subsets of clones. Overall, heterozygous mutations were most frequent in intergenic space and more frequent in introns than exons. A significantly larger percentage of CpG, CHG, and CHH sites in repetitive intergenic space experienced transition mutations than genic and non-repetitive intergenic spaces, likely because of higher levels of methylation in the region and the disposition of methylated cytosines to spontaneously deaminate. Of the minority of mutations that occurred in exons, larger proportions of these were putatively deleterious when they occurred in relatively few clones.Repetitive intergenic space is a major driver of clone genome diversification. Clonal propagation is associated with the accumulation of putatively deleterious mutations. The data suggest selection against deleterious variants in coding regions such that mutations are less frequent in coding than noncoding regions of the genome.