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Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2025,4,22]]},"abstract":"<jats:p>Membrane frizzled-related protein (MFRP), present in the retinal pigment epithelium (RPE), is an integral membrane protein essential for ocular development and the normal physiology of the retina. Mutations in MFRP are associated with autosomal recessive nonsyndromic nanophthalmos, leading to severe hyperopia and early-onset retinitis pigmentosa. While several preclinical gene-augmentation and gene-editing trials hold promise for future therapies aimed at stopping degeneration and restoring retinal function, the molecular mechanisms involved in MFRP biology are still not well understood. Here, we studied the biochemical properties of MFRP and the molecular consequences of its loss of function in the retinal degeneration 6 (rd6) mouse model. Using transcriptomic and lipidomic approaches, we observed that accumulation of docosahexaenoic acid (DHA) constitutes a primary defect in the MFRP-deficient RPE. In biochemical assays, we showed that MFRP undergoes extensive glycosylation, and it preferentially binds lipids of several classes, including phosphatidylserine and phosphatidylinositol-4-phosphate; as well as binding to several transmembrane proteins, notably adiponectin receptor 1 (ADIPOR1) and inward rectifier potassium channel 13 (KCNJ13). Moreover, MFRP determines the subcellular localization of ADIPOR1 and KCNJ13 in the RPE in vivo. This feature is altered by MFRP deficiency and can be restored by gene-therapy approaches. Overall, our observations suggest that MFRP constitutes an important interaction hub within the apical membrane of RPE cells, coordinating protein trafficking and subcellular localization within the RPE, and lipid homeostasis within the entire retina.<\/jats:p>","DOI":"10.1073\/pnas.2425523122","type":"journal-article","created":{"date-parts":[[2025,4,18]],"date-time":"2025-04-18T13:45:16Z","timestamp":1744983916000},"update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":6,"title":["MFRP is a molecular hub that organizes the apical membrane of RPE cells by engaging in interactions with specific proteins and lipids"],"prefix":"10.1073","volume":"122","author":[{"given":"Aleksander","family":"Tworak","sequence":"first","affiliation":[{"name":"Department of Ophthalmology, Gavin Herbert Eye Institute, University of California","place":["Irvine"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roman","family":"Smidak","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Gavin Herbert Eye Institute, University of California","place":["Irvine"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carolline","family":"Rodrigues Menezes","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Gavin Herbert Eye Institute, University of California","place":["Irvine"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9655-3659","authenticated-orcid":false,"given":"Samuel W.","family":"Du","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Gavin Herbert Eye Institute, University of California","place":["Irvine"]},{"name":"Department of Physiology and Biophysics, University of California","place":["Irvine"]},{"name":"Department of Chemistry, University of California","place":["Irvine"]},{"name":"Department of Molecular Biology and Biochemistry, University of California","place":["Irvine"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4921-1429","authenticated-orcid":false,"given":"Susie","family":"Suh","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Gavin Herbert Eye Institute, University of California","place":["Irvine"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8762-5473","authenticated-orcid":false,"given":"Elliot H.","family":"Choi","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Gavin Herbert Eye Institute, University of California","place":["Irvine"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sanae S.","family":"Imanishi","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, and Stark Neurosciences Research Institute, Indiana University School of Medicine","place":["Indianapolis"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhiqian","family":"Dong","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Gavin Herbert Eye Institute, University of California","place":["Irvine"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2233-5501","authenticated-orcid":false,"given":"Dominik","family":"Lewandowski","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Gavin Herbert Eye Institute, University of California","place":["Irvine"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kristen E.","family":"Fong","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Gavin Herbert Eye Institute, University of California","place":["Irvine"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabriela","family":"Grigorean","sequence":"additional","affiliation":[{"name":"Proteomics Core Facility, Genome Center, University of California","place":["Davis"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonio F. M.","family":"Pinto","sequence":"additional","affiliation":[{"name":"Clayton Foundation Laboratories for Peptide Biology, Salk Institute for Biological Studies","place":["La Jolla"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qianlan","family":"Xu","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Gavin Herbert Eye Institute, University of California","place":["Irvine"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dorota","family":"Skowronska-Krawczyk","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Gavin Herbert Eye Institute, University of California","place":["Irvine"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1338-8476","authenticated-orcid":false,"given":"Seth","family":"Blackshaw","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Johns Hopkins University","place":["Baltimore"]},{"name":"Department of Neurology, Institute for Cell Engineering, Kavli Neuroscience Discovery Institute, Johns Hopkins University","place":["Baltimore"]},{"name":"Solomon H. Snyder Department of Neuroscience, Johns Hopkins University","place":["Baltimore"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4696-4836","authenticated-orcid":false,"given":"Yoshikazu","family":"Imanishi","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, and Stark Neurosciences Research Institute, Indiana University School of Medicine","place":["Indianapolis"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0788-545X","authenticated-orcid":false,"given":"Krzysztof","family":"Palczewski","sequence":"additional","affiliation":[{"name":"Department of Ophthalmology, Gavin Herbert Eye Institute, University of California","place":["Irvine"]},{"name":"Department of Physiology and Biophysics, University of California","place":["Irvine"]},{"name":"Department of Chemistry, University of California","place":["Irvine"]},{"name":"Department of Molecular Biology and Biochemistry, University of California","place":["Irvine"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"341","published-online":{"date-parts":[[2025,4,18]]},"reference":[{"key":"e_1_3_4_1_2","doi-asserted-by":"publisher","DOI":"10.1093\/hmg\/11.16.1879"},{"key":"e_1_3_4_2_2","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.0501451102"},{"key":"e_1_3_4_3_2","first-page":"2623","article-title":"Membrane frizzled-related protein gene-related ophthalmological syndrome: 30-month follow-up of a sporadic case and review of genotype-phenotype correlation in the literature","volume":"18","author":"Neri A.","year":"2012","unstructured":"A. Neri , Membrane frizzled-related protein gene-related ophthalmological syndrome: 30-month follow-up of a sporadic case and review of genotype-phenotype correlation in the literature. Mol. Vis. 18, 2623\u20132632 (2012).","journal-title":"Mol. 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Wang , Acyl-CoA synthetase 6 controls rod photoreceptor function and survival by shaping the phospholipid composition of retinal membranes. Commun. Biol. 71, 1\u201311 (2024).","journal-title":"Commun. Biol."},{"key":"e_1_3_4_41_2","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.1142-19.2019"},{"key":"e_1_3_4_42_2","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.bi.63.070194.003125"},{"key":"e_1_3_4_43_2","doi-asserted-by":"publisher","DOI":"10.1172\/jci.insight.156301"},{"key":"e_1_3_4_44_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.jbc.2024.107291"},{"key":"e_1_3_4_45_2","doi-asserted-by":"publisher","DOI":"10.1016\/S1350-9462(00)00004-5"},{"key":"e_1_3_4_46_2","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0002839"},{"key":"e_1_3_4_47_2","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.0607241103"},{"key":"e_1_3_4_48_2","doi-asserted-by":"publisher","DOI":"10.1074\/jbc.M112.346569"},{"key":"e_1_3_4_49_2","unstructured":"G. Grigorean K. Palczewski MFRP in the retina is a molecular hub that organizes the apical membrane of RPE cells by engaging in interactions with specific protein and lipid molecules- MS dataset. MassIVE. https:\/\/doi.org\/doi:10.25345\/C5S756X5Z. Deposited 6 December 2024."},{"key":"e_1_3_4_50_2","unstructured":"A. Tworak K. Palczewski MFRP in the retina is a molecular hub that organizes the apical membrane of RPE cells by engaging in interactions with specific protein and lipid molecules - RNAseq dataset. NCBI Gene Expression Omnibus. https:\/\/www.ncbi.nlm.nih.gov\/geo\/query\/acc.cgi?acc=GSE283089. 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