Suppression of Ca2+ signaling in a mouse model of Best disease

Youwen Zhang, J. Brett Stanton, Jiang Wu, Kuai Yu, H. Criss Hartzell, Neal S. Peachey, Lihua Y. Marmorstein, Alan D. Marmorstein

Research output: Contribution to journalArticle

66 Scopus citations

Abstract

Mutations in BEST1, encoding bestrophin-1 (Best1), cause Best vitelliform macular dystrophy (BVMD), a dominantly inherited macular degeneration characterized by a diminished electrooculogram light peak (LP), lipofuscin in retinal pigment epithelial cells (RPE), and fluid-and debris-filled retinal detachments. To understand the pathogenesis of BVMD we generated knock-in mice carrying the BVMD-causing mutation W93C in Best1. Both Best1+/W93Cand Best1W93C/W93C mice had normal ERG a- and b-waves, but exhibited an altered LP luminance response reminiscent of that observed in BVMD patients. Morphological analysis identified fluid-and debris-filled retinal detachments in mice as young as 6 months of age. By 18-24 months of age Best1+/W93Cand Best1W93C/W93C mice exhibited enhanced accumulation of lipofuscin in the RPE, and a significant deposition of debris composed of unphagocytosed photoreceptor outer segments and lipofuscin granules in the subretinal space. Although Best1 is thought to function as a Ca2+-activated Cl- channel, RPE cells from Best1W93C mice exhibited normal Cl- conductances. We have previously shown that Best1-/- mice exhibit increased [Ca2+]i in response to ATP stimulation. However, ATP-stimulated changes in [Ca2+]i in RPE cells from Best1+/W93C and Best1W93C/W93C mice were suppressed relative to Best1+/+ littermates. Based on these data we conclude that mice carrying the Best1W93C mutation are a valid model for BVMD. Furthermore, these data suggest that BVMD is not because of Best1 deficiency, as the phenotypes of Best1+/W93C and Best1W93C/W93C mice are distinct from that of Best1-/- mice with regard to lipofuscin accumulation, and changes in the LP and ATP Ca2+ responses. Published by Oxford University Press 2010.

Original languageEnglish (US)
Article numberddp583
Pages (from-to)1108-1118
Number of pages11
JournalHuman molecular genetics
Volume19
Issue number6
DOIs
StatePublished - Mar 2010

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Genetics(clinical)

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    Zhang, Y., Stanton, J. B., Wu, J., Yu, K., Hartzell, H. C., Peachey, N. S., Marmorstein, L. Y., & Marmorstein, A. D. (2010). Suppression of Ca2+ signaling in a mouse model of Best disease. Human molecular genetics, 19(6), 1108-1118. [ddp583]. https://doi.org/10.1093/hmg/ddp583