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. 1991 Nov 1;88(21):9387–9391. doi: 10.1073/pnas.88.21.9387

Isolation of temperature-sensitive mutations of the tyrosine kinase receptor sevenless (sev) in Drosophila and their use in determining its time of action.

M C Mullins 1, G M Rubin 1
PMCID: PMC52722  PMID: 1658781

Abstract

Loss-of-function mutations in the sevenless (sev) gene in Drosophila result in the failure to differentiate a specific photoreceptor cell type--namely, the R7 cell. The sev gene encodes a cell-surface receptor tyrosine kinase that functions in the presumptive R7 cell to transduce developmental cues from its neighbors, instructing it to differentiate along the R7 cell pathway. We have isolated temperature-sensitive alleles of sev and used them to show that Sev activity is required for several hours during the development of each R7 cell to specify R7 cell differentiation. Our data also suggest that the presumptive R7 cell remains for approximately 5 hr in an undetermined state in the absence of the Sev-mediated signal before committing to an alternative fate. We have determined the molecular lesions in four of the temperature-sensitive alleles. One of these mutations disrupts the Gly-Xaa-Gly-Xaa-Xaa-Gly consensus in the ATP-binding site of the kinase domain.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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