Structural analysis of point mutations in the Hairless gene and their association with the activity of the Hairless protein.

The Notch signaling pathway (NSP) is an important intercellular communication mechanism that regulates embryo development and adult physiological functions. The Hairless (H) protein is a powerful antagonist of the NSP by its interaction with the Suppressor of Hairless (Su[H]) protein, recruiting the corepressors Gro and CtBP. In the present work, we examined the role of several important amino acids in different H protein domains analyzing four mutant lines of Drosophila melanogaster. The mutant alleles were evaluated by single-strand conformational polymorphism (SSCP) analysis and we located mutated regions at different positions along the sequence of the Hairless gene.