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See detailTruncation mutations in ABCA1 suppress normal upregulation of full-length ABCA1 by 9-cis-retinoic acid and 22-R-hydroxycholesterol
Wellington, C. L.; Yang, Y. Z.; Zhou, S. et al

in Journal of Lipid Research (2002), 43(11), 1939-1949

Mutations in ABCA1 uniformly decrease plasma HDL-cholesterol (HDL-C) and reduce cholesterol efflux, yet different mutations in ABCA1 result in different phenotypic effects in heterozygotes. For example ... [more ▼]

Mutations in ABCA1 uniformly decrease plasma HDL-cholesterol (HDL-C) and reduce cholesterol efflux, yet different mutations in ABCA1 result in different phenotypic effects in heterozygotes. For example, truncation mutations result in significantly lower HDL-C and apoliprotein A-I (apoA-I) levels in heterozygotes compared with nontruncation mutations, suggesting that truncation mutations may negatively affect the wild-type allele. To specifically test this hypothesis, we examined ABCA1 protein expression in response to 9-cis-retinoic acid (9-cis-RA) and 22-R-hydroxycholesterol (22-R-OH-Chol) in a collection of human fibroblasts representing eight different mutations and observed that truncation mutations blunted the response to oxysterol stimulation and dominantly suppressed induction of the remaining full-length allele to 5–10% of wild-type levels. mRNA levels between truncation and nontruncation mutations were comparable, suggesting that ABCA1 expression was suppressed at the protein level. Dominant negative activity of truncated ABCA1 was recapitulated in an in vitro model using transfected Cos-7 cells. Our results suggest that the severe reduction of HDL-C in patients with truncation mutations may be at least partly explained by dominant negative suppression of expression and activity of the remaining full-length ABCA1 allele. [less ▲]

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See detailAge and residual cholesterol efflux affect HDL cholesterol levels and coronary artery disease in ABCA1 heterozygotes
Clee, S. M.; Kastelein, J. J.; van Dam, M. et al

in Journal of Clinical Investigation (2000), 106(10), 1263-1270

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See detailMutations in ABC1 in Tangier disease and familial high-density lipoprotein deficiency
Brooks-Wilson, A.; Marcil, M.; Clee, S. M. et al

in Nature Genetics (1999), 22(4), 336-45

Detailed reference viewed: 173 (15 UL)