Author:
Holstege Henne,Pfeiffer Wayne,Sie Daoud,Hulsman Marc,Nicholas Thomas J.,Lee Clarence C.,Ross Tristen,Lin Jue,Miller Mark A.,Ylstra Bauke,Meijers-Heijboer Hanne,Brugman Martijn H.,Staal Frank J.T.,Holstege Gert,Reinders Marcel J.T.,Harkins Timothy T.,Levy Samuel,Sistermans Erik A.
Abstract
The somatic mutation burden in healthy white blood cells (WBCs) is not well known. Based on deep whole-genome sequencing, we estimate that approximately 450 somatic mutations accumulated in the nonrepetitive genome within the healthy blood compartment of a 115-yr-old woman. The detected mutations appear to have been harmless passenger mutations: They were enriched in noncoding, AT-rich regions that are not evolutionarily conserved, and they were depleted for genomic elements where mutations might have favorable or adverse effects on cellular fitness, such as regions with actively transcribed genes. The distribution of variant allele frequencies of these mutations suggests that the majority of the peripheral white blood cells were offspring of two related hematopoietic stem cell (HSC) clones. Moreover, telomere lengths of the WBCs were significantly shorter than telomere lengths from other tissues. Together, this suggests that the finite lifespan of HSCs, rather than somatic mutation effects, may lead to hematopoietic clonal evolution at extreme ages.
Publisher
Cold Spring Harbor Laboratory
Subject
Genetics (clinical),Genetics
Cited by
128 articles.
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