TY - JOUR
T1 - Droplet Microfluidics Platform for Highly Sensitive and Quantitative Detection of Malaria-Causing Plasmodium Parasites Based on Enzyme Activity Measurement
AU - Juul, Sissel
AU - Nielsen, Christine Juul Fælled
AU - Labouriau, Rodrigo
AU - Roy, Amit
AU - Tesauro, Cinzia
AU - Jensen, Pia Wrensted
AU - Harmsen, Charlotte
AU - Kristoffersen, Emil Laust
AU - Chiu, Ya-Ling
AU - Hougaard, Rikke Frøhlich
AU - Fiorani, Paola
AU - Cox-Singh, Janet
AU - Tordrup, David Paul
AU - Koch, Jørn Erland
AU - Bienvenu, Anne-Losi
AU - Desideri, Alessandro
AU - Picot, Stephane
AU - Petersen, Eskild
AU - Leong, Kam W
AU - Ho, Yi-Ping
AU - Stougaard, Magnus
AU - Knudsen, Birgitta R
PY - 2012/12
Y1 - 2012/12
N2 - We present an attractive new system for the specific and sensitive detection of the malaria-causing Plasmodium parasites. The system relies on isothermal conversion of single DNA cleavage–ligation events catalyzed specifically by the Plasmodium enzyme topoisomerase I to micrometer-sized products detectable at the single-molecule level. Combined with a droplet microfluidics lab-on-a-chip platform, this design allowed for sensitive, specific, and quantitative detection of all human-malaria-causing Plasmodium species in single drops of unprocessed blood with a detection limit of less than one parasite/μL. Moreover, the setup allowed for detection of Plasmodium parasites in noninvasive saliva samples from infected patients. During recent years malaria transmission has declined worldwide, and with this the number of patients with low-parasite density has increased. Consequently, the need for accurate detection of even a few parasites is becoming increasingly important for the continued combat against the disease. We believe that the presented droplet microfluidics platform, which has a high potential for adaptation to point-of-care setups suitable for low-resource settings, may contribute significantly to meet this demand. Moreover, potential future adaptation of the presented setup for the detection of other microorganisms may form the basis for the development of a more generic platform for diagnosis, fresh water or food quality control, or other purposes within applied or basic science.
AB - We present an attractive new system for the specific and sensitive detection of the malaria-causing Plasmodium parasites. The system relies on isothermal conversion of single DNA cleavage–ligation events catalyzed specifically by the Plasmodium enzyme topoisomerase I to micrometer-sized products detectable at the single-molecule level. Combined with a droplet microfluidics lab-on-a-chip platform, this design allowed for sensitive, specific, and quantitative detection of all human-malaria-causing Plasmodium species in single drops of unprocessed blood with a detection limit of less than one parasite/μL. Moreover, the setup allowed for detection of Plasmodium parasites in noninvasive saliva samples from infected patients. During recent years malaria transmission has declined worldwide, and with this the number of patients with low-parasite density has increased. Consequently, the need for accurate detection of even a few parasites is becoming increasingly important for the continued combat against the disease. We believe that the presented droplet microfluidics platform, which has a high potential for adaptation to point-of-care setups suitable for low-resource settings, may contribute significantly to meet this demand. Moreover, potential future adaptation of the presented setup for the detection of other microorganisms may form the basis for the development of a more generic platform for diagnosis, fresh water or food quality control, or other purposes within applied or basic science.
U2 - 10.1021/nn3038594
DO - 10.1021/nn3038594
M3 - Journal article
C2 - 23121492
SN - 1936-0851
VL - 6
SP - 10676
EP - 10683
JO - A C S Nano
JF - A C S Nano
IS - 12
ER -