AJTMH Transactions of the Royal Society of Tropical Medicine and Hygiene
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Am. J. Trop. Med. Hyg., 51(4), 1994, pp. 495-500
Copyright © 1994 by The American Society of Tropical Medicine and Hygiene

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Cloning and Characterization of a Repetitive DNA Sequence Specific for Wuchereria bancrofti

Kithmini Siridewa, Eric H. Karunanayake, N. V. Chandrasekharan, W. Abeyewickreme, Lena Franzen, Lena Aslund AND Ulf Pettersson
Department of Biochemistry and Molecular Biology and Department of Parasitology, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka; Department of Medical Genetics, Biomedical Center, University of Uppsala, Uppsala, Sweden; Department of Immunology, Karolinska Institute, Stockholm, Sweden

A genomic library constructed in a bacteriophage lambda replacement vector (EMBL3) with Wuchereria bancrofti DNA partially digested with Sau 3A I was screened with 32P-labeled W. bancrofti total DNA, and a strongly reactive recombinant, EMBL3Wb34, was isolated. This clone contained an approximately 16-kb insert that showed some cross-hybridization with Brugia malayi and B. pahangi DNA. However, a 969-bp subclone from EMBL3Wb34, designated pWb12, hybridized only with W. bancrofti DNA and was able to detect as little as 300 pg. Furthermore, pWb12 could detect DNA from a single infective larva or one microfilaria. It has a moderate copy number (450–700) and appears to be interspersed within the parasite genome. The nucleotide sequence contains 66% A + T and 34% G + C and shows no notable internal repeats.







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Copyright © 1994 by the American Society of Tropical Medicine and Hygiene.