Genetics, Vol 137, 1039-1048, Copyright © 1994


INVESTIGATIONS

string of pearls Encodes Drosophila Ribosomal Protein S2, Has Minute-Like Characteristics, and Is Required During Oogenesis

S. E. Cramton and F. A. Laski
Molecular Biology Institute, Department of Biology, University of California, Los Angeles, Los Angeles, California 90024

The first allele of string of pearls (sop) was isolated as a recessive female sterile mutant in a P element enhancer trap screen. Oogenesis in homozygous sop females arrests at approximately stage 5. In addition, homozygous flies of both sexes have Minute-like characteristics that include reduced bristles, delayed development and larval lethality. sop maps to 30D/E on chromosome 2L and encodes the Drosophila homolog of eukaryotic ribosomal protein S2. The gene is present in a single copy in the Drosophila genome and the level of mRNA present in mutant animals is reduced. The identification of a mutant allele that blocks development at a mid-stage of oogenesis may indicate that sop has a specific developmental role during oogenesis in addition to its general role in protein synthesis as a component of the small ribosomal subunit.


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