Abstract：
:Sequences of the internal transcribed spacers (ITS1 and ITS2) of the mosquito Aedes aegypti, and the ITS2 of six related species, A. simpsoni, A. albopictus, A. vexans, A. triseriatus, Haemagogus mesodentatus, and Psorophora ferox are reported. Intraspecific variation in A. aegypti ITS1 is 1.07% among four clones from three individuals, and in the ITS2 is 1.17% among 15 clones from four individuals. In A. simpsoni, intraspecific ITS2 variation is 0.46% among 10 clones from a single individual. Alignment of the ITS2 sequence of the seven species reveals several homologous domains. Secondary structure predictions for the ITS2 region indicate that these domains base pair to form a core region central to several stem features. The sequence outside the ITS2 homologous domains tends to be GC-rich and characteristically slippage generated; these areas preserve or add to the stem length of the predicted secondary structures. These ITS2 intraspacer variable regions resemble previously described expansion segments of the 28S gene region. Evolutionary analysis of the ITS2 of these species, using both sequence and secondary structure information, leads to the prediction of divergence in the mosquito tribe Aedini that is not clearly reflected in current taxonomic designations.
journal_name
Mol Phylogenet Evoljournal_title
Molecular phylogenetics and evolutionauthors
Wesson DM,Porter CH,Collins FHdoi
10.1016/1055-7903(92)90001-wkeywords:
subject
Has Abstractpub_date
1992-12-01 00:00:00pages
253-69issue
4eissn
1055-7903issn
1095-9513journal_volume
1pub_type
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