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Retinal very long-chain PUFAs: new insights from studies on ELOVL4 protein
Open accessAbstract
Compared with other mammalian tissues, retina is highly enriched in PUFA. Long-chain PUFA (LC-PUFA; C18-C24) are essential FAs that are enriched in the retina and are necessary for maintenance of normal retinal development and function. The retina, brain, and sperm also contain very LC-PUFA (VLC-PUFA; >C24). Although VLC-PUFA were discovered more than two decades ago, very little is known about their biosynthesis and functional roles in the retina. This is due mainly to intrinsic difficulties associated with working on these unusually long polyunsaturated hydrocarbon chains and their existence in small amounts. Recent studies on the FA elongase elongation of very long chain fatty acids-4 (ELOVL4) protein, however, suggest that VLC-PUFA probably play some uniquely important roles in the retina as well as the other tissues. Mutations in the ELOVL4 gene are found in patients with autosomal dominant Stargardt disease. Here, we review the recent literature on VLC-PUFA with special emphasis on the elongases responsible for their synthesis. We focus on a novel elongase, ELOVL4, involved in the synthesis of VLC-PUFA, and the importance of these FAs in maintaining the structural and functional integrity of retinal photoreceptors.
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Endoplasmic reticulum stress and the unfolded protein responses in retinal degeneration
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BackgroundInfluentialHigh Resolution MALDI Imaging Mass Spectrometry of Retinal Tissue Lipids
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“These results further confirm that some teleostei Elovl4, in contrast to mammalian orthologues (Agbaga et al., 2010a), can play an active role in the biosynthesis of DHA (Monroig et al., 2010a; 2011).”
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Polyunsaturated Fatty Acid Biosynthesis and Metabolism in Fish
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Essential Role of ELOVL4 Protein in Very Long Chain Fatty Acid Synthesis and Retinal Function
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Why has Nature Chosen Lutein and Zeaxanthin to Protect the Retina?
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“More recently, a new class of non-dietary polyunsaturated fatty acids with chain lengths greater than 24 carbons, the very long-chain polyunsaturated acids (VLC-PUFAs), were identified in the vertebrate retina and just a few other tissues (2, 3).”
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“PLoS One 6, e16733 (2011) Abbreviations: AMD: age-related macular degeneration, BM: Bruch’s membrane, RPE: retinal pigment epithelium, CNV: choroidal neovascularization, BMP4: bone morphogenetic protein-4, TNF: tumor necrosis factor, SNP: single nucleotide polymorphisms, C3: complement component 3, MAC: membrane attac…”
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“Furthermore, phospholipids containing very long-chain PUFAs (VLC-PUFAs, >C24, with 3 to 9 double bonds) likely play a unique and important role in the retina because they are necessary for cell survival, and their loss leads to cell death [92,93].”
Cacciola, F., Donato, P., Sciarrone, D., Dugo, P., & Mondello, L. (2016) · Analytical Chemistry · doi:10.1021/acs.analchem.6b04370 · Cited by 60
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ELOVL4 protein preferentially elongates 20:5n3 to very long chain PUFAs over 20:4n6 and 22:6n3
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“It is currently unclear whether and to what degree photoreceptor loss observed in age-related macular degeneration (AMD) patients (9), STGD3 patients (10), and transgenic (TG)mouse STGD3models (11–13) are primarily caused by loss of VLC-PUFAs (4, 8, 14), from secondary dominant negative consequences of protein aggrega…”
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“[7, 16] concluded ELOVL4 did not participate in DHA biosynthesis in mammals or may play a redundant role, the latter hypothesis aligning well with the overlapping roles between Elovl2 and Elovl4 described above.”
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“The phospholipids containing very-long-chain polyunsaturated fatty acids present in the disk membranes of rod outer segments likely play a unique and important role in the retina because they are necessary for cell survival and their loss leads to cell death [157,158].”
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Sander, C. L., Sears, A. E., Pinto, A. F. M., Choi, E. H., Kahremany, S., Gao, F., Salom, D., Jin, H., Pardon, E., Suh, S., et al. (2021) · Journal of Cell Biology · doi:10.1083/jcb.202101063 · Cited by 36
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“Recent studies on the synthesis of very long chain poly unsaturated fatty acids (VLC-PUFA) suggest that VLC-PUFA play important roles in the retina; these fatty acids are over 30 carbons in length with 4 or more double bonds (Agbaga et al., 2010; Bennett and Anderson, 2016).”
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Ablation of retinal ciliopathy protein RPGR results in altered photoreceptor ciliary composition
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“2 Although much less abundant than long-chain (C11-C20) FAs (LCFAs), VLCFAs are ubiquitous among tissues and play an important function that cannot be substituted for by LCFAs, including skin barrier formation, neural function, retina function, and resolution of inflammation (1-3).”
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Serum levels of lipid metabolites in age‐related macular degeneration
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“However, very-long-chain polyunsaturated fatty acids (whose production is catalyzed by ELOVL-4) are similar to DHA because of their role in photoreceptor function and integrity (63).”
BackgroundJiang, M., Guo, B., Wan, X., Gong, Y., Zhang, Y., & Hu, C. (2014) · Marine Drugs · doi:10.3390/md12031317 · Cited by 29
“The n-3 PUFAs including DHA and EPA can be used as preventive drugs and supplements [3–6].”
Kabeya, N., Chiba, M., Haga, Y., Satoh, S., & Yoshizaki, G. (2017) · Comparative Biochemistry and Physiology Part B Biochemistry and Molecular Biology · doi:10.1016/j.cbpb.2017.09.002 · Cited by 29
“Since these tissues a major metabolic site for LCPUFA (Agbaga et al., 2010), it is reasonable that both genes show relatively high expressions.”
BackgroundDimitroglou, M., Iliodromiti, Z., Christou, E., Volaki, P., Petropoulou, C., Sokou, R., Boutsikou, Τ., & Iacovidou, N. M. (2022) · Diagnostics · doi:10.3390/diagnostics12092208 · Cited by 28
Logan, S., Agbaga, M., Chan, M. D., Brush, R. S., & Anderson, R. E. (2014) · Journal of Lipid Research · doi:10.1194/jlr.m045443 · Cited by 28
Bazan, N. G. (2020) · Journal of Lipid Research · doi:10.1194/jlr.tr120001137 · Cited by 27
“ELOVL4 catalyzes the synthesis of VLC-PUFAs in the retina (10, 21) and testes (22) and generates VLC-saturated FAs in the skin and brain (23, 24).”
BackgroundNaganuma, T., & Kihara, A. (2014) · PLoS ONE · doi:10.1371/journal.pone.0101823 · Cited by 29
“Saturated and monounsaturated VLCFAs are specifically used for sphingolipid production [2,3,4], whereas most polyunsaturated VLCFAs are incorporated into glycerophospholipids [5,6,7].”
BackgroundOkuda, A., Naganuma, T., Ohno, Y., Abe, K., Yamagata, M., Igarashi, Y., & Kihara, A. (2010) · PubMed Central · Cited by 26
Factors Differentiating the Antioxidant Activity of Macular Xanthophylls in the Human Eye Retina
Widomska, J., Gruszecki, W. I., & Subczynski, W. K. (2021) · Antioxidants · doi:10.3390/antiox10040601 · Cited by 25
Oral Metformin Inhibits Choroidal Neovascularization by Modulating the Gut-Retina Axis
Zhang, J. Y., Xiao, J. F., Xie, B., Barba, H., Boachie-Mensah, M., Shah, R. N., Nadeem, U., Spedale, M., Dylla, N. P., Lin, H., et al. (2023) · Investigative Ophthalmology & Visual Science · doi:10.1167/iovs.64.15.21 · Cited by 25
Retinal de novo lipogenesis coordinates neurotrophic signaling to maintain vision
Rajagopal, R., Zhang, S., Wei, X., Doggett, T. A., Adak, S., Enright, J. M., Shah, V., Ling, G., Chen, S., Yoshino, J., et al. (2018) · JCI Insight · doi:10.1172/jci.insight.97076 · Cited by 23
“In particular, docosahexaenoic acid–containing (DHA-containing) phospholipids are abundant (28), and these species are preferentially localized to specialized membrane structures, such as synaptic membranes.”
BackgroundFerrero, E., Vaz, F. M., Cheillan, D., Brusco, A., & Marelli, C. (2025) · Molecular Genetics and Metabolism · doi:10.1016/j.ymgme.2025.109050 · Cited by 24
“…and belong to the ω 3 and ω 6 families [32], are incorporated into phosphatidylcholines at the sn-1 position, with DHA at the sn-2 position; these ULCFA-containing phosphatidylcholines in the retinal outer segment membrane of photo-receptors are crucial for phototransduction [33][34].”
Understanding the Roles of Very-Long-Chain Polyunsaturated Fatty Acids (VLC-PUFAs) in Eye Health
Nwagbo, U., & Bernstein, P. S. (2023) · Nutrients · doi:10.3390/nu15143096 · Cited by 26
“They have a hybrid structure combining a proximal carboxylic end characteristic of saturated fatty acids and a distal end containing methylene-interrupted cis double bonds [2] (Figure 1).”
BackgroundInfluentialGarlito, B., Portolés, T., Niessen, W. M. A., Navarro, J. C., Hontoria, F., Monroig, Ó., Varó, I., & Serrano, R. (2018) · Analytica Chimica Acta · doi:10.1016/j.aca.2018.11.001 · Cited by 25
Das, Y., Swinkels, D., & Baes, M. I. (2021) · International Journal of Molecular Sciences · doi:10.3390/ijms22084101 · Cited by 24
Xu, W., Wang, S., You, C., Zhang, Y., Monroig, Ó., Tocher, D. R., & Li, Y. (2019) · Comparative Biochemistry and Physiology Part B Biochemistry and Molecular Biology · doi:10.1016/j.cbpb.2019.110373 · Cited by 23
Ribes‐Navarro, A., Navarro, J. C., Hontoria, F., Kabeya, N., Standal, I. B., Evjemo, J. O., & Monroig, Ó. (2021) · Marine Drugs · doi:10.3390/md19040226 · Cited by 24
“Analysis of VLC-PUFAs from natural samples is technically challenging [56,57] and it can be only accurately performed on lipid samples prepared from specific polar lipid fractions collected from key tissues such as the CNS or retina.”
BackgroundVidal, E., Jun, B., Gordon, W. C., Maire, M., Martine, L., Gregoire, S., Khoury, S., Cabaret, S., Berdeaux, O., Acar, N., et al. (2020) · Journal of Lipid Research · doi:10.1194/jlr.ra120001057 · Cited by 23
“(37–40) or retinal diseases (41, 42) because they share similar mechanical features with humans.”
BackgroundMorais, S., Torres-Rodríguez, M., Hontoria, F., Monroig, Ó., Varó, I., Agulleiro, M. J., & Navarro, J. C. (2020) · International Journal of Molecular Sciences · doi:10.3390/ijms21103514 · Cited by 22
“From what is known in higher vertebrates, VLC-PUFA are generally incorporated into phosphatidylcholine in the photoreceptor cells that make up the retina [7], and are then bioconverted into elovanoids, which participate in photoreceptor protection [8,13].”
BackgroundResultInfluentialOlivares‐González, L., Velasco, S., Gallego, I., Esteban‐Medina, M., Puras, G., Loucera, C., Martínez‐Romero, A., Peña-Chilet, M., Pedraz, J. L., & Rodrigo, R. (2022) · Antioxidants · doi:10.3390/antiox12010098 · Cited by 21
“Furthermore, retinal elongases, especially ELOVL4, synthetize very-long-chain PUFAs (VLC-PUFAs) [14] from DHA, which are converted in elovanoids (PD analogues) in response to oxidative stress protecting PRs and RPE cells [15].”
BackgroundZhu, K.-C., Ling, S., Zhao, C.-P., Guo, H., Zhang, N., Guo, L. J., Liu, B.-S., Jiang, S., & Zhang, D. (2018) · Frontiers in Physiology · doi:10.3389/fphys.2018.01340 · Cited by 21
Torres-Cuevas, I., Millán, I., Asensi, M. A., Vento, M., Oger, C., Galano, J., Durand, T., & Ortega, Á. (2021) · Antioxidants · doi:10.3390/antiox10020168 · Cited by 21
“The retina is one of the body tissues with the highest concentration of long-chain polyunsaturated fatty acids (PUFAs), the latter being essential for the maintenance of the physiological retinal function and development [10,11].”
BackgroundDas, Y., Swinkels, D., Kocherlakota, S., Vinckier, S., Vaz, F. M., Wever, E. J. M., van Kampen, A. H. C., Jun, B., Do, K. V., Moons, L., et al. (2021) · Frontiers in Cell and Developmental Biology · doi:10.3389/fcell.2021.632930 · Cited by 21
“The marked accumulation of PUFAs with ultra-long chains (≥ C34) raised the question whether this was related to increased expression of the Elovl4 gene in the retina, given its role in the elongation of fatty acids containing ≥ 26 carbons (Agbaga et al., 2010).”
BackgroundInfluentialCardiac dysfunction affects eye development and vision by reducing supply of lipids in fish
Sørhus, E., Meier, S., Donald, C. E., Furmanek, T., Edvardsen, R. B., & Lie, K. K. (2021) · The Science of The Total Environment · doi:10.1016/j.scitotenv.2021.149460 · Cited by 20
Dysfunctional peroxisomal lipid metabolisms and their ocular manifestations
Chen, C. T., Shao, Z., & Fu, Z. (2022) · Frontiers in Cell and Developmental Biology · doi:10.3389/fcell.2022.982564 · Cited by 19
Wojciechowski, A. M., Bell, B. A., Song, Y., Anderson, B. D., Conomikes, A., Petruconis, C. R., & Dunaief, J. L. (2024) · Experimental Eye Research · doi:10.1016/j.exer.2024.110028 · Cited by 20
Hama, K., Nagai, T., 西澤, 千., Ikeda, K., Morita, M., Satoh, N., Nakanishi, H., Imanaka, T., Shimozawa, N., Taguchi, R., et al. (2013) · Lipids · doi:10.1007/s11745-013-3848-5 · Cited by 21
“Polyunsaturated VLCFA are usually found in the retina and testis of normal mammals, including humans [3, 4].”
BackgroundEtiology and treatment of adrenoleukodystrophy: new insights from Drosophila
Gordon, H. B., Valdez, L., & Letsou, A. (2018) · Disease Models & Mechanisms · doi:10.1242/dmm.031286 · Cited by 22
“Interestingly, in humans, the longest VLCFA species are found only in tissues expressing elongases, namely the retina, brain and testis, all three of which are key tissues affected in ALD (Agbaga et al., 2010; Ahmad et al., 2009).”
Evaluating Ultra-long-Chain Fatty Acids as Biomarkers of Colorectal Cancer Risk
Perttula, K., Edmands, W. M. B., Grigoryan, H., Cai, X., Iavarone, A. T., Gunter, M. J., Naccarati, A., Polidoro, S., Hubbard, A., Vineis, P., et al. (2016) · Cancer Epidemiology Biomarkers & Prevention · doi:10.1158/1055-9965.epi-16-0204 · Cited by 18
Bioengineered Plants Can Be an Alternative Source of Omega-3 Fatty Acids for Human Health
Lakra, N., Mahmood, S., Marwal, A., M., S. N., & Anwar, K. (2019) · Springer eBooks · doi:10.1007/978-3-030-03344-6_16 · Cited by 18
Torres-Rodríguez, M., Navarro, J. C., Varó, I., Agulleiro, M. J., Morais, S., Monroig, Ó., & Hontoria, F. (2020) · Aquaculture · doi:10.1016/j.aquaculture.2020.734949 · Cited by 19
Torres-Rodríguez, M., Navarro, J. C., Varó, I., Monroig, Ó., & Hontoria, F. (2020) · Aquaculture · doi:10.1016/j.aquaculture.2020.735314 · Cited by 18
Agbaga, M., Stiles, M. A., Brush, R. S., Sullivan, M. T., Machalinski, A. H., Jones, K. L., Anderson, R. E., & Sherry, D. M. (2020) · Molecular Neurobiology · doi:10.1007/s12035-020-02052-8 · Cited by 18
“ELOVL4 is the only known fatty acid elongase that performs this function [1, 2].”
Background
Metadata
- Authors
- Agbaga, M.-P., Mandal, M. N. A., & Anderson, R. E.
- Affiliations
- Dean McGee Eye Institute (US)
- Corresponding author
- Anderson, Robert E.
- Venue
- Journal of Lipid Research
- Publisher
- Elsevier BV
- Published
- 2010-07
- Volume
- 51
- Issue
- 7
- Pages
- 1624-1642
- ISSN
- 0022-2275 (ISSN-L)
- PMC
- PMC2882734
- OpenAlex
- W2137994863
- Cited by
- 167
- References
- 254
- Citations by year
- 2026: 2 · 2025: 11 · 2024: 8 · 2023: 12 · 2022: 11 · 2021: 19 · 2020: 13 · 2019: 12 · 2018: 15 · 2017: 12 · 2016: 10 · 2015: 6 · 2014: 9 · 2013: 7 · 2012: 7
- FWCI
- 0.97
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Lipid Research (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- National Eye Institute (P30EY012190, EY-12190, EY04149, R01EY000871, R01EY004149, EY 00871)
- National Center for Research Resources (RR 17703, P20RR017703)
- Topics
- Health Sciences › Nursing › Nutrition and Dietetics › Fatty Acid Research and Health
- Health Sciences › Medicine › Ophthalmology › Retinal Development and Disorders
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
- Keywords
- very long chain polyunsaturated fatty acids, ELOVL4, fatty acid elongation, retinal lipids, Stargardt disease, photoreceptors, retinal development, fatty acid synthesis, essential fatty acids
- MeSH terms
- Fatty Acid Elongases, Acetyltransferases, Animals, Cell Membrane, DNA Mutational Analysis, Eye Proteins, Fatty Acids, Unsaturated, Humans, Membrane Proteins, Retina, Retinaldehyde, Substrate Specificity, Tissue Distribution, Molecular Structure
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