Abstract:
BACKGROUND:The characterization of microchimerism (MC) by gene amplification has been limited by few allogeneic markers, ascertainment bias, and assay analytic performance. To address this, a panel of 12 MC assays based on insertion-deletion (InDel) polymorphisms had been optimized. STUDY DESIGN AND METHODS:The InDel assays were validated with comprehensive in vitro spiking studies at the stochastic limit of detection. Their ability was also determined to ascertain MC of unknown source genotype with both theoretical and actual donor-recipient pairs, and the assays were applied to a clinical population of 73 trauma patients who received transfusions where MC was previously characterized by HLA-based assays alone. RESULTS:In the stochastic spiking experiments, all assays were sensitive to a single copy of target DNA, and no false-positive amplification occurred among 1128 samples studied. Among 219 theoretical donor-recipient pairs, informative alleles existed for 99.5 percent with both InDel and HLA compared to 91.3 percent with HLA alone. In the clinical population, 33 cases of MC were detected (9 more cases than by HLA-DR alone) in the nonleukoreduced (non-LR) group and 8 cases (1 more case than by HLA-DR) in the LR group for the short-term follow-up. Among 27 long-term follow-up samples, 8 cases were detected overall (3 more cases than by HLA-DR alone). CONCLUSION:It is concluded that an InDel-based assay panel has excellent technical performance characteristics while also allowing for ascertainment of some MC cases not detectable with HLA alone. The tandem use of both the InDel and the HLA provides a powerful tool for the enhanced ascertainment of MC.
journal_name
Transfusionjournal_title
Transfusionauthors
Lee TH,Chafets DM,Reed W,Wen L,Yang Y,Chen J,Utter GH,Owings JT,Busch MPdoi
10.1111/j.1537-2995.2006.00992.xsubject
Has Abstractpub_date
2006-11-01 00:00:00pages
1870-8issue
11eissn
0041-1132issn
1537-2995pii
TRF00992journal_volume
46pub_type
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