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Identification of a novel Brugia pahangi beta-tubulin gene (beta 2) and a 22-nucleotide spliced leader sequence on beta 1-tubulin mRNA. Export

Molecular and Biochemical Parasitology, Vol. 50 (1992), pp. 275-284.

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We have examined the expression of beta-tubulin genes in the parasitic nematode, Brugia pahangi. A genomic library was constructed and screened by hybridization with a Haemonchus contortus beta-tubulin cDNA fragment which recognizes several B. pahangi beta-tubulin sequences, including sequences which correspond to the previously characterized beta 1-tubulin gene. The B. pahangi beta 2-tubulin gene was isolated by selecting clones which hybridize to the H. contortus beta-tubulin gene but which do not hybridize to the beta 1-tubulin gene. A partial sequence of the beta 2-tubulin gene confirms that it codes for a distinct beta-tubulin. Southern hybridization analyses show that the beta 2-tubulin sequence exists as a single copy gene within the B. pahangi genome. Expression of the beta 2-tubulin gene is developmentally regulated and the message is found predominantly in adult male worms, whereas the beta 1-tubulin gene is expressed in microfilariae and approximately equal levels of the transcript are found in male and female adult worms. During mRNA maturation the beta 1-tubulin mRNA of microfilariae and adult worms acquires a trans-spliced leader identical to the SL1 of Caenorhabditis elegans.


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