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. 1991 Sep;129(1):191–201. doi: 10.1093/genetics/129.1.191

Interallelic Complementation among Der/Flb Alleles: Implications for the Mechanism of Signal Transduction by Receptor-Tyrosine Kinases

E Raz 1, E D Schejter 1, B Z Shilo 1
PMCID: PMC1204566  PMID: 1936959

Abstract

The large number of available embryonic lethal alleles in the Drosophila EGF receptor homolog (DER)/faint little ball locus allowed us to test the possibility of positive or negative interactions among different DER alleles. These interactions were monitored by examining the embryonic cuticular phenotypes of different heteroallelic combinations. Several positive interactions were identified, while negative interactions were restricted to a single allele. This is the first example of positive interactions within the same cell type among alleles of a receptor tyrosine kinase gene. The basis for these interactions is likely to arise from the mechanism of signal transduction by receptor tyrosine kinases, which involves receptor aggregation. A combination of two different DER mutant proteins defective in temporally distinct stages of the signal transduction process, may thus form a functional heterodimer. The mutation sites in four alleles showing positive interactions were localized. They identify regions within the protein which are likely to be important for these temporally distinct signal transduction processes.

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Selected References

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