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  • Title: Peptidylarginine deiminase enzymes and citrullinated proteins in female reproductive physiology and associated diseases†.
    Author: Christensen AO, Li G, Young CH, Snow B, Khan SA, DeVore SB, Edwards S, Bouma GJ, Navratil AM, Cherrington BD, Rothfuss HM.
    Journal: Biol Reprod; 2022 Dec 10; 107(6):1395-1410. PubMed ID: 36087287.
    Abstract:
    Citrullination, the post-translational modification of arginine residues, is catalyzed by the four catalytically active peptidylarginine deiminase (PAD or PADI) isozymes and alters charge to affect target protein structure and function. PADs were initially characterized in rodent uteri and, since then, have been described in other female tissues including ovaries, breast, and the lactotrope and gonadotrope cells of the anterior pituitary gland. In these tissues and cells, estrogen robustly stimulates PAD expression resulting in changes in levels over the course of the female reproductive cycle. The best-characterized targets for PADs are arginine residues in histone tails, which, when citrullinated, alter chromatin structure and gene expression. Methodological advances have allowed for the identification of tissue-specific citrullinomes, which reveal that PADs citrullinate a wide range of enzymes and structural proteins to alter cell function. In contrast to their important physiological roles, PADs and citrullinated proteins are also involved in several female-specific diseases including autoimmune disorders and reproductive cancers. Herein, we review current knowledge regarding PAD expression and function and highlight the role of protein citrullination in both normal female reproductive tissues and associated diseases.
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