Nucleolus organizer-suppressed position-effect variegation in Drosophila melanogaster
نویسندگان
چکیده
منابع مشابه
Histone Gene Multiplicity and Position Effect Variegation in DROSOPHILA MELANOGASTER.
The histone genes of wild-type Drosophila melanogaster are reiterated 100-150 times per haploid genome and are located in the segment of chromosome 2 that corresponds to polytene bands 39D2-3 to E1-2. The influence of altered histone gene multiplicity on chromatin structure has been assayed by measuring modification of the gene inactivation associated with position effect variegation in genotyp...
متن کاملGenomic imprinting and position-effect variegation in Drosophila melanogaster.
Genomic imprinting is a phenomenon in which the expression of a gene or chromosomal region depends on the sex of the individual transmitting it. The term imprinting was first coined to describe parent-specific chromosome behavior in the dipteran insect Sciara and has since been described in many organisms, including other insects, plants, fish, and mammals. In this article we describe a mini-X ...
متن کاملSingle-locus modification of position-effect variegation in Drosophila melanogaster. I. White variegation.
mechanism of position-eff ect variegation has been and remains a fasciT?ating puzzle, tan talizing the student of the genetics of somewhat higher organisms with the hope that here is a clue to the riddle of the sequential shifts of control during development. This view is elaborated in BAKER’S (1963) able review of his own and his colleagues’ work. One of the more refractory aspects of the puzz...
متن کاملEffect of the Suppressor of Underreplication (SuUR) gene on position-effect variegation silencing in Drosophila melanogaster.
It has been previously shown that the SuUR gene encodes a protein located in intercalary and pericentromeric heterochromatin in Drosophila melanogaster polytene chromosomes. The SuUR mutation suppresses the formation of ectopic contacts and DNA underreplication in polytene chromosomes; SuUR+ in extra doses enhances the expression of these characters. This study demonstrates that heterochromatin...
متن کاملPosition effect variegation in Drosophila melanogaster: relationship between suppression effect and the amount of Y chromosome.
Position effect variegation results from chromosome rearrangements which translocate euchromatic genes close to the heterochromatin. The euchromatin-heterochromatin association is responsible for the inactivation of these genes in some cell clones. In Drosophila melanogaster the Y chromosome, which is entirely heterochromatic, is known to suppress variegation of euchromatic genes. In the presen...
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ژورنال
عنوان ژورنال: Genetical Research
سال: 1991
ISSN: 0016-6723,1469-5073
DOI: 10.1017/s0016672300029396