- Nohara A, Kawashiri M, Claudel T, Mizuno M, Tsuchida M, Takata M, et al. High frequency of a retinoid X receptor gamma gene variant in familial combined hyperlipidemia that associates with atherogenic dyslipidemia. Arterioscler Thromb Vasc Biol. 2007;27:923-8 pubmed..01). In vitro, RXRgamma Ser14 showed significantly stronger repression of the lipoprotein lipase promoter than RXRgamma Gly14. These findings suggest that RXRgamma contributes to the genetic background of FCHL. ..