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Repeat sequences of approximately 100 base pairs in length were found in the rDNA ITS2 region of  Anopheles barbirostris  van der Wulp (Diptera: Culicidae) species A1, A2, A3, A4, and  An. campestris -like in the  An. barbirostris  complex. Variation in the number of repeats was observed among the five sibling species. Specifically, 10 repeats were observed in A1, eight in A2, A4, and  campestris -like, and three in A3. Based on similarities in the sequences of the repeats, related repeats were classified into nine groups. Although A2, A4, and the  campestris -like species had the same number of repeats, the ITS2 region of the three species contained different groups of repeats. Excluding the repeat sequences facilitated good alignment of the ITS2 region in the five sibling species. Phylogenetic analyses of the 95 isolines were compared with results obtained from mitochondrial genes (COI and COII). The results revealed marked differences among the five sibling species, particularly regarding the ITS2 region of A3, which was more distinct from the other four species than COI and COIL Repeat sequences in the ITS2 region of other  Anopheles  species retrieved from GenBank also were analyzed. New repeat sequences were found in  An. beklemishevi  Stegnii and Kabanova,  An. crucians  Wiedemann and  An. funestus  Giles, suggesting that the occurrence of repeat sequences in the ITS2 region are not rare in anopheline mosquitoes.

journal of insect science

Variation in Number and Formation of Repeat Sequences in the rDNA ITS2 Region of Five Sibling Species in the<i>Anopheles barbirostris</i>Complex in Thailand

Variation in Number and Formation of Repeat Sequences in the rDNA ITS2 Region of Five Sibling Species in theAnopheles barbirostrisComplex in Thailand