The Mcp element mediates stable long-range chromosome-chromosome interactions in Drosophila.
Chromosome organization inside the nucleus is not random but rather is determined by a variety of factors, including interactions between chromosomes and nuclear components such as the nuclear envelope or nuclear matrix. Such interactions may be critical for proper nuclear organization, chromosome partitioning during cell division, and gene regulation. An important, but poorly documented subset, includes interactions between specific chromosomal regions. Interactions of this type are thought to be involved in long-range promoter regulation by distant enhancers or locus control regions and may underlie phenomena such as transvection. Here, we used an in vivo microscopy assay based on Lac Repressor/operator recognition to show that Mcp, a polycomb response element from the Drosophila bithorax complex, is able to mediate physical interaction between remote chromosomal regions. These interactions are tissue specific, can take place between multiple Mcp elements, and seem to be stable once established. We speculate that this ability to interact may be part of the mechanism through which Mcp mediates its regulatory function in the bithorax complex.
Vazquez
Julio
J
Division of Shared Resources, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA. jvazquez@fhcrc.org
Müller
Martin
M
Pirrotta
Vincenzo
V
Sedat
John W
JW
D018528:ATP-Binding Cassette Transporters / Q000235:genetics; D000818:Animals; D023902:Chromosome Pairing / Q000235:genetics*; D002875:Chromosomes / Q000235:genetics / Q000378:metabolism*; D004330:Drosophila / Q000166:cytology / Q000235:genetics*; D029721:Drosophila Proteins / Q000235:genetics; D005136:Eye Proteins / Q000235:genetics; D009875:Operator Regions, Genetic; D012097:Repressor Proteins / Q000378:metabolism; D020218:Response Elements
D018528:ATP-Binding Cassette Transporters; D029721:Drosophila Proteins; D005136:Eye Proteins; D012097:Repressor Proteins; C059254:w protein, Drosophila