title: Isolation of nucleated red blood cells in maternal blood for Non-invasive prenatal diagnosis.
abstract: This paper introduces a two-step cascade enrichment method for isolating nucleated red blood cells (NRBCs) in maternal blood. The two-step enrichment platform consists of a positive enrichment process based on a red blood cell (RBC) hyperaggregation method and a negative enrichment process using microfluidic technology. An analytical evaluation using blood samples from patients with leukemia showed that the while blood cell (WBC) depletion and NRBC loss rates of the positive enrichment process were 93.98 % and 6.02 %, respectively. Through the two-step cascade enrichment method, 1-396 NRBCs and only 0-6 WBCs were isolated from 1 mL of 18 maternal blood samples. Experimental results also showed that the WBC depletion rate of the proposed two-step method was more than 625,000-fold, and the purity of enriched NRBCs ranged from 20 % to 100 %. Furthermore, SRY (the sex-determining region of the Y chromosome) genes were detected in enriched NRBCs, thereby demonstrating that enriched NRBCs contain fetus-derived NRBCs.
authors.affiliation: Department of Nano Science and Engineering, Center for Nano Manufacturing, Inje University, 607 Obang-dong, Gimhae, Gyongnam, 621-749, Republic of Korea.
authors.forename: Yeongje
authors.initials: Y
authors.lastname: Byeon
authors.affiliation: Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, 81 Irwon-ro, Gangnam-gu, Seoul, 135-710, Republic of Korea. changski@skku.edu.
authors.forename: Chang-Seok
authors.initials: CS
authors.lastname: Ki
authors.affiliation: Department of Nano Science and Engineering, Center for Nano Manufacturing, Inje University, 607 Obang-dong, Gimhae, Gyongnam, 621-749, Republic of Korea. mems@inje.ac.kr.
authors.forename: Ki-Ho
authors.initials: KH
authors.lastname: Han
mesh_terms: D002469:Cell Separation; D004867:Equipment Design; D004900:Erythroblasts / Q000166:cytology*; D004906:Erythrocyte Count; D004912:Erythrocytes / Q000166:cytology; D005260:Female; D005312:Fetal Blood; D006801:Humans; D007962:Leukocytes / Q000166:cytology; D008297:Male; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*; D051876:Sex-Determining Region Y Protein / Q000235:genetics
chemical_list: C497745:SRY protein, human; D051876:Sex-Determining Region Y Protein
keywords: Lateral magnetophoretic microseparator; Microfluidic device; Nucleated red blood cells; Prenatal diagnosis; RBC hyperaggregation