Summary
As a result of a genetic analysis of 63 third chromosome suppressor mutations of position-effect variegation 12 different loci showing dominant suppression have been identified and their map positions determined. A compilcation of the genetic data available for each suppressor locus is given. The strong suppressor effects of the mutations have been quantified by measurements of white variegation inw m4h/w m4h,w m4h/Y andw m4h/O flies. Mutant alleles of three loci were found in these studies to dominate over the strong enhancer effect of complete loss of the Y chromosome. Most of the identified loci suppressing position-effect variegation represent essential genetic funtions; only three loci represent nonessential functions. Mutations of two loci display recessive butyrate sensitivity and lethal interaction with the heterochromatic Y chromosome suggesting that these genes affect chromosomal condensation. Studies with deficiencies and triploids revealed that most of the loci represent haplo-abnormal suppressor functions. The use of the isolated mutant material for genetic, developmental and molecular studies of processes connected with gene inactivation in position-effect variegation is discussed.
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Communicated by K. Illmensee
Dedicated to Prof. H.J. Becker on the occasion of his 6th birthday
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Reuter, G., Dorn, R., Wustmann, G. et al. Third chromosome suppressor of position-effect variegation loci in Drosophila melanogaster . Molec Gen Genet 202, 481–487 (1986). https://doi.org/10.1007/BF00333281
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DOI: https://doi.org/10.1007/BF00333281