2014/04/23 by Henne Holstege, Wayne Pfeiffer, Daoud Sie +15 · 1 citation
Biochemistry, Genetics and Molecular Biology · Medicine · #Cancer Genomics and Diagnostics #Acute Myeloid Leukemia Research #Genomics and Rare Diseases #Biology #Somatic cell #Haematopoiesis #Telomere #Genetics #Mutation #Germline mutation #Stem cell #Blood cell #Compartment (ship) #Genome #Gene #White (mutation) #Allele #Hematopoietic stem cell
paper · pdf · doi:10.1101/gr.162131.113
openalex publication_date 2014/04/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
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.