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Borte, Stephan; von Döbeln, Ulrika; Fasth, Anders; Wang, Ning; Janzi, Magdalena; Winiarski, Jacek; Sack, Ulrich; Pan-Hammarström, Qiang; Borte, Michael; Hammarström, Lennart
Blood, 03/2012, Volume: 119, Issue: 11Journal Article
Severe combined immunodeficiency (SCID) and X-linked agammaglobulinemia (XLA) are inborn errors of immune function that require prompt diagnosis and treatment to prevent life-threatening infections. The lack of functional T or B lymphocytes in these diseases serves as a diagnostic criterion and can be applied to neonatal screening. A robust triplex PCR method for quantitation of T-cell receptor excision circles (TRECs) and κ-deleting recombination excision circles (KRECs), using a single Guthrie card punch, was developed and validated in a cohort of 2560 anonymized newborn screening cards and in 49 original stored Guthrie cards from patients diagnosed with SCID, XLA, ataxia-telangiectasia, Nijmegen-breakage-syndrome, common variable immunodeficiency, immunoglobulin A deficiency, or X-linked hyper-IgMsyndrome. Simultaneous measurement of TREC and KREC copy numbers in Guthrie card samples readily identified patients with SCID, XLA, ataxia-telangiectasia and Nijmegen-breakage-syndrome and thus facilitates effective newborn screening for severe immunodeficiency syndromes characterized by the absence of T or B cells.
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