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Mishra S, Manohar V, Chandel S, Manoj T, Bhattacharya S, Hegde N, Nath VR, Krishnan H, Wendling C, Di Mattia T, Martinet A, Chimata P, Alpy F, Raghu P. A genetic screen to uncover mechanisms underlying lipid transfer protein function at membrane contact sites. Life Sci Alliance 2024; 7:e202302525. [PMID: 38499328 PMCID: PMC10948934 DOI: 10.26508/lsa.202302525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 03/04/2024] [Accepted: 03/05/2024] [Indexed: 03/20/2024] Open
Abstract
Lipid transfer proteins mediate the transfer of lipids between organelle membranes, and the loss of function of these proteins has been linked to neurodegeneration. However, the mechanism by which loss of lipid transfer activity leads to neurodegeneration is not understood. In Drosophila photoreceptors, depletion of retinal degeneration B (RDGB), a phosphatidylinositol transfer protein, leads to defective phototransduction and retinal degeneration, but the mechanism by which loss of this activity leads to retinal degeneration is not understood. RDGB is localized to membrane contact sites through the interaction of its FFAT motif with the ER integral protein VAP. To identify regulators of RDGB function in vivo, we depleted more than 300 VAP-interacting proteins and identified a set of 52 suppressors of rdgB The molecular identity of these suppressors indicates a role of novel lipids in regulating RDGB function and of transcriptional and ubiquitination processes in mediating retinal degeneration in rdgB9 The human homologs of several of these molecules have been implicated in neurodevelopmental diseases underscoring the importance of VAP-mediated processes in these disorders.
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Affiliation(s)
- Shirish Mishra
- https://ror.org/03gf8rp76 National Centre for Biological Sciences-TIFR, GKVK Campus, Bangalore, India
| | - Vaishnavi Manohar
- https://ror.org/03gf8rp76 National Centre for Biological Sciences-TIFR, GKVK Campus, Bangalore, India
| | - Shabnam Chandel
- https://ror.org/03gf8rp76 National Centre for Biological Sciences-TIFR, GKVK Campus, Bangalore, India
| | - Tejaswini Manoj
- https://ror.org/03gf8rp76 National Centre for Biological Sciences-TIFR, GKVK Campus, Bangalore, India
| | - Subhodeep Bhattacharya
- https://ror.org/03gf8rp76 National Centre for Biological Sciences-TIFR, GKVK Campus, Bangalore, India
| | - Nidhi Hegde
- https://ror.org/03gf8rp76 National Centre for Biological Sciences-TIFR, GKVK Campus, Bangalore, India
| | - Vaisaly R Nath
- https://ror.org/03gf8rp76 National Centre for Biological Sciences-TIFR, GKVK Campus, Bangalore, India
- School of Biotechnology, Amrita Vishwa Vidyapeetham, Kollam, India
| | - Harini Krishnan
- https://ror.org/03gf8rp76 National Centre for Biological Sciences-TIFR, GKVK Campus, Bangalore, India
| | - Corinne Wendling
- Université de Strasbourg, CNRS, Inserm, IGBMC UMR 7104- UMR-S 1258, Illkirch, France
| | - Thomas Di Mattia
- Université de Strasbourg, CNRS, Inserm, IGBMC UMR 7104- UMR-S 1258, Illkirch, France
| | - Arthur Martinet
- Université de Strasbourg, CNRS, Inserm, IGBMC UMR 7104- UMR-S 1258, Illkirch, France
| | - Prasanth Chimata
- https://ror.org/03gf8rp76 National Centre for Biological Sciences-TIFR, GKVK Campus, Bangalore, India
| | - Fabien Alpy
- Université de Strasbourg, CNRS, Inserm, IGBMC UMR 7104- UMR-S 1258, Illkirch, France
| | - Padinjat Raghu
- https://ror.org/03gf8rp76 National Centre for Biological Sciences-TIFR, GKVK Campus, Bangalore, India
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