TLR4 and psoriatic arthritis: Significant association was observed between a missense variant rs4986790 of TLR4 (Asp229Gly) and plaque type psoriasis (p = 2 × 10−4) which was also notable in those with psoriatic arthritis (p = 2 × 10−4) and early-onset psoriasis (p = 8 × 10−4).