Background: Human mitochondrial DNA (mtDNA) polymorphisms can be used to detect allogeneic transfused platelets. To increase the number of informative polymorphisms we investigated three hypervariable regions (HVR1, HVR2, and HVR3) within the displacement loop (D-loop) region of the mtDNA.
Study Design And Methods: mtDNA was obtained from 119 unrelated blood donors. Forward and reverse primers were designed and conditions optimized to amplify and sequence the template mtDNA by dye terminator cycle sequencing.
Results: We established a sequencing protocol for all three HVRs of the mtDNA. Polymorphic sites were found in all three regions: 66 in HVR1, 44 in HVR2, and 18 in HVR3. Combining the sequence information of HVR1, -2, and -3 resulted in 105 different genotypes of which 95 were unique. We were able to discriminate between two randomly chosen individuals with a random match probability of 1.2 percent.
Conclusion: The D-loop region of mtDNA contains a wealth of informative molecular markers for chimerism and survival studies after transfusions of cellular blood components.
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