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Prepublished online as a Blood First Edition Paper on September 22, 2003; DOI 10.1182/blood-2003-05-1724.

Submitted May 29, 2003
Accepted September 11, 2003
Marked mitochondrial DNA sequence heterogeneity in single CD34+ cell clones from normal adult bone marrow
Myung G Shin, Sachiko Kajigaya, J P McCoy, Jr, Barbara C Levin, and Neal S Young*
Hematology Branch, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD, USA
Flow Cytometry Core Facility, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD, USA
Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, USA
* Corresponding author; email: youngn{at}nhlbi.nih.gov.
Somatic mitochondrial DNA (mtDNA) mutations accumulate with age in postmitotic tissues but have been postulated to be diluted and lost in continually proliferating tissues such as bone marrow (BM). Having observed marked sequence variation among normal individuals' total BM cell mtDNA, we undertook to analyze the mtDNA control region in a total of 611 individual CD34+ clones from six adult BM donors and to compare these results with the sequences from 580 CD34+ clones from five umbilical cord blood (CB) samples. On average, twenty-five percent (11-50%) of individual CD34+ clones from adult BM showed mtDNA heterogeneity, or sequence differences from the aggregate mtDNA sequence of total BM cells of the same individual. In contrast, only 1.6% of single CD34+ clones from CB showed mtDNA sequence variation from the aggregate pattern. Thus, age-dependent accumulation of mtDNA mutations appears relatively common in a mitotically active human tissue and may provide a method to approximate the mutation rate in mammalian cells, to assess the contribution of reactive oxygen species to genomic instability, and for natural 'marking' of hematopoietic stem cells; our data also have important implications for the aging process, forensic identifications and anthropological conclusions dependent on the mtDNA sequence.

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