PMID: 2093704Jan 1, 1990Paper

Chromosomal localization and copy number of 18S + 28S ribosomal RNA genes in evolutionarily diverse mosquitoes (Diptera, Culicidae)

Hereditas
A Kumar, K S Rai

Abstract

In situ hybridization using 3H-labeled 18S and 28S ribosomal DNA (rDNA) probes from Aedes albopictus was performed on the mitotic chromosomes of 20 species of mosquitoes belonging to 8 genera of subfamilies Culicinae and Anophelinae. In all but one species examined, the rDNA family was localized to a single chromosome per haploid genome. Aedes triseriatus was the only exception, with the rDNA cistrons present on chromosome 1 and on chromosome 3. The ribosomal RNA genes were located on chromosome 1 in Ae. albopictus, Ae. aegypti, Ae. flavopictus, Ae. seatoi, A. polynesiensis, Ae. alcasidi, Ae. annandalei, Ae. mascarensis, Ae. hendersoni, Ae. atropalpus, Ae. epactius, Culex pipiens quinquefasciatus, Wyeomyia smithii, and Sabethes cyaneus; chromosome 2 in Ae. mediovittatus and Haemagogus equinus; chromosome 3 in Armigeres subalbatus and Tripteroides bambusa; and the heteromorphic X and Y chromosomes in Anopheles quadrimaculatus. The variation in the location of ribosomal RNA genes on the different chromosomes and at different positions on the chromosome arm among the mosquito species examined is suggestive of considerable chromosome repatterning through translocations and inversions in the karyotypic evolution of mosquitoes. Dot-b...Continue Reading

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