Abstract
The rate of 3H-uridine incorporation into X-chromosome and autosomal RNA was measured as an indicator of relative transcription activity in larvae carrying various Sxl mutant alleles. Hyperactivity of X chromosomes was found in heteroallelic Sxl f#1/Sxlfhv#1 and homozygous Sxl f#2 female larvae. Sxl fhv#1 homozygotes, Sxl f#1/Sxl+ heterozygotes, heteroallelic Sxl f#2/Sxlf#2 as well as homozygous Sxl f#ba female larvae exhibited normal X chromosome transcription. Except for Sxl f#ba, there is a correlation between the viability of the mutants and the degree to which X-chromosome activity is elevated. Male larvae carrying the dominant male-specific lethal mutation Sxl M#1 displayed X chromosomes only half as wide as those of control larvae. However, it could not be determined whether this property is the result of a lower transcription rate or of underreplication of the mutated X chromosomes. The results demonstrate that the Sxl gene plays an important role in controlling X-chromosome activity. The relationship among the various genes known to act in sex differentiation and dosage compensation is discussed.
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References
Ashburner, M.: Pattern of puffing activity in the salivary gland chromosomes of Drosophila. V. Responses to environmental treatments. Chromosoma (Berl.) 31, 356–376 (1970)
Baker, B.S., Ridge, K.A.: Sex and the single cell. I. On the action of major loci affecting sex determination in Drosophila melanogaster. Genetics 94, 383–423 (1980)
Belote, J.M., Lucchesi, J.C.: Male-specific lethal mutations of Drosophila melanogaster. Genetics 94, 165–186 (1980a)
Belote, J.M., Lucchesi, J.C.: Control of X chromosome transcription by the maleless gene in Drosophila. Nature (Lond.) 285, 573–575 (1980b)
Bridges, C.B.: The genetics of sex in Drosophila. In: Sex and internal secretions, pp. 55–93. Baltimore: Williams and Wilkins 1932
Cline, T.W.: Two closely linked mutations in Drosophila melanogaster that are lethal to opposite sexes and interact with daughterless. Genetics 90, 683–698 (1978)
Cline, T.W.: A product of the maternally-influenced Sex-lethal gene determines sex in Drosophila melanogaster. Genetics 91, s22 (1979a)
Cline, T.W.: A male-specific lethal mutation in Drosophila melanogaster that transforms sex. Develop. Biol. 72, 266–275 (1979b)
Lindsley, D.L., Grell, E.H.: Genetic Variations of Drosophila melanogaster. Carnegie Inst. Wash. Publ. No. 627 (1968)
Lucchesi, J.C.: Dosage compensation: transcription-level regulation of X-linked genes in Drosophila. Amer. Zool. 17, 685–693 (1977)
Maroni, G., Plaut, W.: Dosage compensation in Drosophila melanogaster triploids. I. Autoradiographic study. Chromosoma (Berl.) 40, 361–377 (1973)
Mukherjee, A.S., Beermann, W.: Synthesis of ribonucleic acid by the X-chromosomes of Drosophila melanogaster and the problem of dosage compensation. Nature (Lond.) 207, 785–786 (1965)
Muller, H.J.: Evidence of the precision of genetic adaptation. Harvey Lecture Ser. 43, 165–229 (1950)
Muller, H.J., Zimmering, S.: A sex-linked lethal without evident effect in Drosophila males but partially dominant in females. Genetics 45, 1001–1002 (1960)
Skripsky, T., Lucchesi, J.C.: Females with sex-combs. Genetics 94, s98 (1980)
Smith, P.D., Lucchesi, J.C.: The role of sexuality in dosage compensation in Drosophila. Genetics 61, 607–618 (1969)
Snedecor, G.W., Cochran, W.G.: Statistical Methods. Ames: The Iowa State University Press 1967
Stewart, B., Merriam, J.: Dosage compensation. In: The genetics and biology of Drosophila (M. Ashburner and T.R.F. Wright, eds.), Vol. 2d, pp. 107–140. London: Academic Press 1980
Zimmering, S., Muller, H.J.: Studies on the action of the dominant Female-lethal Fl and of a seemingly less extreme allele Fls. Dros. Inf. Serv. 35, 103–104 (1961)
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We dedicate this work, with respect and affection, to Professor Wolfgang Beermann in honor of his sixtieth birthday
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Lucchesi, J.C., Skripsky, T. The link between dosage compensation and sex differentiation in Drosophila melanogaster . Chromosoma 82, 217–227 (1981). https://doi.org/10.1007/BF00286106
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DOI: https://doi.org/10.1007/BF00286106