Introgressive hybridization and evolution of a novel protein phenotype: Glue protein profiles in thenasuta-albomicans complex ofDrosophila |
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Authors: | S Aruna H A Ranganath |
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Institution: | (1) Drosophila Stock Center, Department of Studies in Zoology, University of Mysore, Manasagangotri, 570 006 Mysore, India |
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Abstract: | Glue proteins are tissue-specific proteins synthesized by larval salivary gland cells ofDrosophila. InDrosophila nasuta nasuta andD. n. albomicans of thenasuta subgroup, the genes that encode the major glue protein fractions are X-linked. In the present study, these X-linked markers
have been employed to trace the pattern of introgression ofD. n. nasuta andD. n. albomicans genomes with respect to the major glue protein fractions in their interracial hybrids, called cytoraces. These cytoraces
have inherited the chromosomes of both parents and have been maintained in the laboratory for over 400–550 generations. The
analysis has revealed that cytoraces withD. n. albomicans X chromosome show eitherD. n. nasuta pattern or a completely novel pattern of glue protein fractions. Further, quantitative analysis also shows lack of correlation
between the chromosomal pattern of inheritance and overall quantity of the major glue protein fractions in the cytoraces.
Thus, in cytoraces the parental chromosomes are not just differentially represented but there is evidence for introgression
even at the gene level. |
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Keywords: | hybridization introgression glue proteins novel proteins Drosophila |
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