Trichohyalin is a protein in humans that is encoded by the TCHHgene.
Trichohyalin confers mechanical strength to the hair follicle inner root sheath and to other toughened epithelial tissues, such as the hard palate and filiform ridges of the tongue, by forming multiple complex crosslinks with itself and with other structural proteins. The enzyme converts arginine to citrulline at the inner root sheath and medulla of hair follicles.
^Rogers GE, Rothnagel JA (1983). "A sensitive assay for the enzyme activity in hair follicles and epidermis that catalyses the peptidyl-arginine-citrulline post-translational modification". Current Problems in Dermatology. 11: 171–84. PMID6653155.
Yamamoto S, Hirai K, Hasegawa-Oka Y, Hirai Y (February 2009). "Molecular elements of the regulatory control of keratin filament modulator AHF/trichohyalin in the hair follicle". Experimental Dermatology. 18 (2): 152–9. doi:10.1111/j.1600-0625.2008.00777.x. PMID18643848.
Lee SC, Wang M, McBride OW, O'Keefe EJ, Kim IG, Steinert PM (January 1993). "Human trichohyalin gene is clustered with the genes for other epidermal structural proteins and calcium-binding proteins at chromosomal locus 1q21". The Journal of Investigative Dermatology. 100 (1): 65–8. doi:10.1111/1523-1747.ep12354504. PMID8423399.
Steinert PM, Parry DA, Marekov LN (October 2003). "Trichohyalin mechanically strengthens the hair follicle: multiple cross-bridging roles in the inner root shealth". The Journal of Biological Chemistry. 278 (42): 41409–19. doi:10.1074/jbc.M302037200. PMID12853460.
O'Keefe EJ, Hamilton EH, Lee SC, Steinert P (July 1993). "Trichohyalin: a structural protein of hair, tongue, nail, and epidermis". The Journal of Investigative Dermatology. 101 (1 Suppl): 65S–71S. doi:10.1111/1523-1747.ep12362866. PMID7686953.
Fietz MJ, Rogers GE, Eyre HJ, Baker E, Callen DF, Sutherland GR (November 1992). "Mapping of the trichohyalin gene: co-localization with the profilaggrin, involucrin, and loricrin genes". The Journal of Investigative Dermatology. 99 (5): 542–4. doi:10.1111/1523-1747.ep12667301. PMID1431214.
Leung MC, Sutton CW, Fenton DA, Tobin DJ (October 2010). "Trichohyalin is a potential major autoantigen in human alopecia areata". Journal of Proteome Research. 9 (10): 5153–63. doi:10.1021/pr100422u. PMID20722389.
Lee SC, Kim IG, Marekov LN, O'Keefe EJ, Parry DA, Steinert PM (June 1993). "The structure of human trichohyalin. Potential multiple roles as a functional EF-hand-like calcium-binding protein, a cornified cell envelope precursor, and an intermediate filament-associated (cross-linking) protein". The Journal of Biological Chemistry. 268 (16): 12164–76. PMID7685034.