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. 1988 Oct;120(2):503–517. doi: 10.1093/genetics/120.2.503

Genetic Analysis of the Heterochromatin of Chromosome 3 in Drosophila Melanogaster. I. Products of Compound-Autosome Detachment

G E Marchant 1, D G Holm 1
PMCID: PMC1203528  PMID: 17246480

Abstract

The heterochromatin of the third chromosome is the largest uncharacterized region of the Drosophila melanogaster genome, and the last major block of D. melanogaster heterochromatin to be thoroughly analyzed. In the present study, this region was genetically dissected by generating and analyzing a series of attached, detached and reattached third chromosomes. Separate detachment experiments were conducted for all 12 possible combinations of four newly synthesized sister-strand compound-3L and three newly synthesized sister-strand compound-3R chromosomes. A total of 443 recessive lethal detachment products carrying putative heterochromatic deficiencies were tested for complementation in a several-stage complementation analysis. The results revealed the presence of seven separable vital regions in the heterochromatin of chromosome 3. Attempts to reattach deficiency-carrying detachment products established that six of these vital regions are on the left arm, but only one is on the right arm. An analysis of the types and frequencies of detachment-product deficiencies generated in each detachment experiment permitted the genetic characterization of the progenitor compounds. It was also possible to determine the proximal-distal orientation of the genes on each arm, and to identify possible breakpoints for each lethal detachment product produced. The results of this study suggest that vital genes in the heterochromatin of the third chromosome are not randomly distributed between, nor within, the heterochromatic blocks of the left and right arms.

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Selected References

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