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Wnt domain found in the WNT signaling gene family, also called Wingless-type mouse mammary tumor virus (MMTV) integration site family Wnt genes have been identified in vertebrates and invertebrates, but not in plants, unicellular eukaryotes, or prokaryotes. In humans, 19 WNT proteins are known. Because of their insolubility little is known about the structure of Wnt proteins, but all have 23 or 24 Cys residues whose spacing is highly conserved. Signal transduction by Wnt proteins (including the Wnt/beta-catenin, the Wnt/Ca++, and the Wnt/polarity pathway) is mediated by receptors of the Frizzled and LDL-receptor-related protein (LRP) families. Wnt signaling mediated by Wnt proteins orchestrates and influences a myriad of cellular processes, such as cell proliferation, differentiation, tumorigenesis, apoptosis, and participation in immune defense during microbe infection.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",