Anti-Troponin I fast skeletal muscle/TNNI2 Antibody Picoband® Fluoro594 Conjugated

Troponin I, fast skeletal muscle is a protein that in humans is encoded by the TNNI2 gene. It is mapped to 11p15.5. This gene encodes a fast-twitch skeletal muscle protein, a member of the troponin I gene family, and a component of the troponin complex including troponin T, troponin C and troponin I subunits. The troponin complex, along with tropomyosin, is responsible for the calcium-dependent regulation of striated muscle contraction. Mouse studies show that this component is also present in vascular smooth muscle and may play a role in regulation of smooth muscle function. In addition to muscle tissues, this protein is found in corneal epithelium, cartilage where it is an inhibitor of angiogenesis to inhibit tumor growth and metastasis, and mammary gland where it functions as a co-activator of estrogen receptor-related receptor alpha. This protein also suppresses tumor growth in human ovarian carcinoma. Mutations in this gene cause myopathy and distal arthrogryposis type 2B. Alternatively spliced transcript variants have been found for this gene.

Highly expressed in brain and weakly in heart, small intestine and uterus. Isoform 1A is mostly expressed in granular cell and molecular layer. Isoform 1B is mostly expressed in Purkinje cells. Isoform 1E is predominantly expressed in peripheral tissues as kidney, lung, trachea, colon, small intestine, stomach, bone marrow, thymus and mammary gland. .

Troponin I is the inhibitory subunit of troponin, the thin filament regulatory complex which confers calcium-sensitivity to striated muscle actomyosin ATPase activity.

1. Barton, P. J. R., Townsend, P. J., Brand, N. J., Yacoub, M. H. Localization of the fast skeletal muscle troponin I gene (TNNI2) to 11p15.5: genes for troponin I and T are organized in pairs. Ann. Hum. Genet. 61: 519-523, 1997. 2. Drera, B., Zoppi, N., Barlati, S., Colombi, M. Recurrence of the p.R156X TNNI2 mutation in distal arthrogryposis type 2B. (Letter) Clin. Genet. 70: 532-534, 2006.