Mosaic: A position-effect variegation eye-color mutant in the mosquito anopheles gambiae

Article Abstract:

The Mosaic (Mos) mutation in mosquitoes confers variegated eye color in the mosquito anopheles gambiae. The inheritance, karyotype and temperature effects on expression of the mutant phenotype is reported. Expression of Mos can be suppressed by rearing larvae at 32 degrees C relative to 22 degrees C. Each characteristic is consistent with Mos being a duplicated wild copy of the pink eye gene.

Mosaicism, Mosquitoes

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Eye pigments in wild-type and eye-color mutant strains of the African malaria vector Anopheles gambiae

Article Abstract:

Mutations in the red-eye (r) and pink-eye (p) loci in the mosquito Anopheles gambiae cause a defect in the movement of or assembly of the eye pigments in the membrane-bound pigment-granules but the synthesis of ommochromes is unaffected. Mosquitoes homozygous for the mutation in the r locus have brick-red colored eyes and the low-mobility xanthommatin spot is ochre-brown instead of red-brown. Mosquitoes containing two mutant alleles at the p locus have white colored eyes and do not contain any xanthommatins. These mutations in the r and p loci affect the last step of xanthommatin synthesis.

Physiological aspects

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Mutations in the Anopheles gambiae pink-eye and white genes define distinct, tightly linked eye-color loci

Article Abstract:

The pink-eye and the white-eye gene loci are tightly linked in the mosquito, Anopheles gambiae. The loci exhibit a recombination frequency of 3.5% and 1.1%. Only two genes on the X chromosome influence eye color and are capable of undergoing mutations. Phenotypic similarity, chromosomal gene conservation, and the presence of molecular lesions in the white gene suggest that many sex-linked mutations in eye color are in white homologs. The white mutants, unlike the pink mutants, show epistasis on expression of the larval body pigmentation phenotype collarless(super +).

Observations

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