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LOCATION AND UNDERREPLICATION OF SATELLITE DNA IN DROSOPHILA MELANOGASTER
Paul Wollenzien 1, Paolo Barsanti 1, and John E. Hearst 1
1 Department of Chemistry, University of California, Berkeley,
California 94720
The two light nuclear satellites (
CsCl = 1.672
and CsCl = 1.687) have been quantified in DNA isolated from
the larvel imaginal discs and brains of Drosophila melanogaster with
the genotypes X/O, X/X and X/Y. By comparing the results
from these different genotypes, the amounts of the two satellites in the
X and Y chromosomes and in the autosomes have been determined.
The lightest satellite is not located to any appreciable extent in the
X chromosome. The heterochromatic regions are not completely filled by
these satellites.—Satellite DNA has also been quantified in DNA isolated
from adults containing different genotypes. The two satellites are underreplicated
to different extents. The apparent amount of underreplication for one of the
satellites is different in different parts of the genome.
Revised on June 2, 1977
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