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We recently generated a mouse strain deficient in expression of the mitochondrial pyrimidine nucleoside kinase thymidine kinase 2 (Tk2), showing that these mice exhibit progressive mtDNA depletion in multiple organs. We used this mouse strain as a model for mtDNA depletion syndromes to investigate the effects of mtDNA depletion on hematopoiesis. MtDNA levels in spleen from the Tk2\u2010deficient mice were decreased 50%, but in contrast to all other investigated organs, both thymus and peripheral blood leukocytes showed normal mtDNA levels. Analysis of peripheral blood and cell populations in spleen, thymus, and bone marrow showed normal findings in the Tk2\u2010deficient mice. The total rates of thymidine phosphorylation\u2014which also include phosphorylation catalyzed by cytosolic Tk 1\u2014in both spleen and thymus from wild\u2010type mice were &gt;50\u2010fold higher than in liver, brain, and muscle. In summary, our data show that blood cells are less dependent on mitochondrial Tk2 compared with several other tissues and that these cells can synthesize deoxyribonucleotides required for mtDNA replication by alternative pathways such as phosphorylation of thymidine by cytosolic Tk1.<\/jats:p>","DOI":"10.1007\/s10545-010-9102-x","type":"journal-article","created":{"date-parts":[[2010,5,3]],"date-time":"2010-05-03T11:12:14Z","timestamp":1272885134000},"page":"231-236","source":"Crossref","is-referenced-by-count":3,"title":["Hematopoiesis in the thymidine kinase 2 deficient mouse model of mitochondrial DNA depletion syndrome"],"prefix":"10.1002","volume":"33","author":[{"given":"Xiaoshan","family":"Zhou","sequence":"first","affiliation":[{"name":"Clinical Microbiology F68, Department of Laboratory Medicine, Karolinska Institute Karolinska University Hospital Huddinge Stockholm SE\u201014186 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