A group of cDNAs isolated from a subtractive ciliary body library of a normal human eye donor revealed 100% identity with TIGR a candidate gene responsible for juvenile open zangle glaucoma [Science 275 (1997) 668-670]. Several structural features of tile deduced human protein have been noted: a cleavable N-terminal signal peptide, a periodic repetition at the N-terminus of leucine and arginine residues at every seventh and eleven position respectively in helix conformation (leucine zipper-like motif) exhibiting homology with myosin, and with olfactomedin in the C-terminus. The mRNA for TIGR is abundantly expressed in the ciliary body, iris, heart and skeletal muscle.
Ortego, J., Escribano, J., & Coca-Prados, M. (1997). Cloning and characterization of subtracted cDNAs from a human ciliary body library encoding TIGR, a protein involved in juvenile open angle glaucoma with homology to myosin and olfactomedin. FEBS Letters, 413(2), 349–353. https://doi.org/10.1016/S0014-5793(97)00934-4