The DOI matches its Crossref record; 8 of the 8 references it cites were found in a registry or an index.
Illuminating the function of the orphan transporter, SLC22A10, in humans and other primates
Open accessPublished version of a preprint
Abstract
SLC22A10 is an orphan transporter with unknown substrates and function. The goal of this study is to elucidate its substrate specificity and functional characteristics. In contrast to orthologs from great apes, human SLC22A10, tagged with green fluorescent protein, is not expressed on the plasma membrane. Cells expressing great ape SLC22A10 orthologs exhibit significant accumulation of estradiol-17β-glucuronide, unlike those expressing human SLC22A10. Sequence alignments reveal a proline at position 220 in humans, which is a leucine in great apes. Replacing proline with leucine in SLC22A10-P220L restores plasma membrane localization and uptake function. Neanderthal and Denisovan genomes show proline at position 220, akin to modern humans, indicating functional loss during hominin evolution. Human SLC22A10 is a unitary pseudogene due to a fixed missense mutation, P220, while in great apes, its orthologs transport sex steroid conjugates. Characterizing SLC22A10 across species sheds light on its biological role, influencing organism development and steroid homeostasis.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cites
Highly accurate protein structure prediction with AlphaFold
Jumper, J., Evans, R., Pritzel, A., Green, T., Figurnov, M., Ronneberger, O., Tunyasuvunakool, K., Bates, R., Žídek, A., Potapenko, A., et al. (2021) · Nature · doi:10.1038/s41586-021-03819-2 · Cited by 43,764
A genomic mutational constraint map using variation in 76,156 human genomes
Chen, S., Francioli, L. C., Goodrich, J. K., Collins, R. L., Kanai, M., Wang, Q., Alföldi, J., Watts, N. A., Vittal, C., Gauthier, L. D., et al. (2024) · Nature · doi:10.1038/s41586-023-06045-0 · Cited by 1,727
The evolution of gene expression levels in mammalian organs
Brawand, D., Soumillon, M., Necsulea, A., Julien, P., Csárdi, G., Harrigan, P., Weier, M., Liechti, A., Aximu-Petri, A., Kircher, M., et al. (2011) · Nature · doi:10.1038/nature10532 · Cited by 1,248
Schiffer, L., Barnard, L., Baranowski, E. S., Gilligan, L. C., Taylor, A. E., Arlt, W., Shackleton, C. H. L., & Storbeck, K.-H. (2019) · The Journal of Steroid Biochemistry and Molecular Biology · doi:10.1016/j.jsbmb.2019.105439 · Cited by 450 · cited 1×
“The liver is a major organ for steroid hormone metabolism, such as UDP-glucuronosyltransferases (UGT), which forms steroidglucuronideconjugatestoenhancewater-solubilityforexcretion by the kidney 48 .”
Characterization of Greater Middle Eastern genetic variation for enhanced disease gene discovery
Greater Middle East Variome Consortium, Scott, E. M., Halees, A., Itan, Y., Spencer, E. G., He, Y., Azab, M. A., Gabriel, S. B., Belkadi, A., Boisson, B., et al. (2016) · Nature Genetics · doi:10.1038/ng.3592 · Cited by 376
Origins of De Novo Genes in Human and Chimpanzee
Ruiz-Orera, J., Hernandez-Rodriguez, J., Chiva, C., Sabidó, E., Kondova, I., Bontrop, R., Marqués-Bonet, T., & Albà, M. M. (2015) · PLOS Genetics · doi:10.1371/journal.pgen.1005721 · Cited by 160
Self-citationNeanderthal-Denisovan ancestors interbred with a distantly related hominin
Rogers, A. R., Harris, N. S., & Achenbach, A. A. (2020) · Science Advances · doi:10.1126/sciadv.aay5483 · Cited by 77
Interpreting the molecular mechanisms of disease variants in human transmembrane proteins
Tiemann, J. K. S., Zschach, H., Lindorff-Larsen, K., & Stein, A. (2023) · Biophysical Journal · doi:10.1016/j.bpj.2022.12.031 · Cited by 35
Flagged first, then by citations
Research works printed but not linked: 72
- Meixner, E. et al. A substrate-based ontology for human solute carriers. Mol. Syst. Biol. 16, e9652 (2020). · DOI
- Yee, S. W. et al. Deorphaning a solute carrier 22 family member, SLC22A15, through functional genomic studies. FASEB J. 34, 15734–15752 (2020). · DOI
- Yee, S. W. et al. Unraveling the functional role of the orphan solute carrier, SLC22A24 in the transport of steroid conjugates through metabolomic and genome-wide association studies. PLoS Genet. 15, e1008208 (2019). · DOI
- Girardi, E. et al. Epistasis-driven identification of SLC25A51 as a regulator of human mitochondrial NAD import. Nat. Commun. 11, 6145 (2020). · DOI · Paper page
- Higuchi, K., Sugiyama, K., Tomabechi, R., Kishimoto, H. & Inoue, K. Mammalian monocarboxylate transporter 7 (MCT7/Slc16a6) is a novel facilitative taurine transporter. J. Biol. Chem. 298, 101800 (2022). · DOI
- Yee, S. W. & Giacomini, K. M. Emerging roles of the human solute carrier 22 family. Drug Metab. Dispos. 50, 1193–1210 (2021). · DOI
- Ren, T., Jones, R. S. & Morris, M. E. Untargeted metabolomics identifies the potential role of monocarboxylate transporter 6 (MCT6/SLC16A5) in lipid and amino acid metabolism pathways. Pharm. Res Perspect. 10, e00944 (2022). · DOI
- Lindberg, F. A., Nordenankar, K., Forsberg, E. C. & Fredriksson, R. SLC38A10 deficiency in mice affects plasma levels of threonine and histidine in males but not in females: a preliminary characterization study of SLC38A10(-/-) Mice. Genes (Basel). 14, 835 (2023). · DOI
- Giacomini, K. M. et al. New and emerging research on solute carrier and ATP binding cassette transporters in drug discovery and development: outlook from the international transporter consortium. Clin. Pharm. Ther. 112, 540–561 (2022). · DOI
- Sun, W., Wu, R. R., van Poelje, P. D. & Erion, M. D. Isolation of a family of organic anion transporters from human liver and kidney. Biochem Biophys. Res Commun. 283, 417–422 (2001). · DOI
- Uhlen, M. et al. Proteomics. Tissue-based map of the human proteome. Science 347, 1260419 (2015). · DOI · Paper page
- Collins, R. L. et al. A structural variation reference for medical and population genetics. Nature 581, 444–451 (2020). · DOI · Paper page
- Wilks, C. et al. recount3: summaries and queries for large-scale RNA-seq expression and splicing. Genome Biol. 22, 323 (2021). · DOI
- Mafessoni, F. et al. A high-coverage Neandertal genome from Chagyrskaya Cave. Proc. Natl Acad. Sci. Usa. 117, 15132–15136 (2020). · DOI · Paper page
- Meyer, M. et al. A high-coverage genome sequence from an archaic Denisovan individual. Science 338, 222–226 (2012). · DOI · Paper page
- Prufer, K. et al. A high-coverage Neandertal genome from Vindija Cave in Croatia. Science 358, 655–658 (2017). · DOI · Paper page
- Prufer, K. et al. The complete genome sequence of a Neanderthal from the Altai Mountains. Nature 505, 43–49 (2014) · DOI · Paper page
- Mallick S. et al. The Allen Ancient DNA Resource (AADR): A curated compendium of ancient human genomes. Sci Data. 11, 182 (2024). · DOI
- Cagiada, M. et al. Understanding the origins of loss of protein function by analyzing the effects of thousands of variants on activity and abundance. Mol. Biol. Evol. 38, 3235–3246 (2021). · DOI
- Zou, L. et al. Molecular mechanisms for species differences in organic anion transporter 1, OAT1: implications for renal drug toxicity. Mol. Pharmacol. 94, 689–699 (2018). · DOI
- Dvorak, V. et al. An overview of cell-based assay platforms for the solute carrier family of transporters. Front Pharmacol. 12, 722889 (2021). · DOI
- Kuang, W. et al. SLC22A14 is a mitochondrial riboflavin transporter required for sperm oxidative phosphorylation and male fertility. Cell Rep. 35, 109025 (2021). · DOI
- Jarvinen, E. et al. The role of uptake and efflux transporters in the disposition of glucuronide and sulfate conjugates. Front Pharmacol. 12, 802539 (2021). · DOI
- Wu, W. et al. Multispecific drug transporter Slc22a8 (Oat3) regulates multiple metabolic and signaling pathways. Drug Metab. Dispos. 41, 1825–1834 (2013). · DOI
- Bush, K. T., Wu, W., Lun, C. & Nigam, S. K. The drug transporter OAT3 (SLC22A8) and endogenous metabolite communication via the gut-liver-kidney axis. J. Biol. Chem. 292, 15789–15803 (2017). · DOI
- Liu, R., Hao, J., Zhao, X. & Lai, Y. Characterization of elimination pathways and the feasibility of endogenous metabolites as biomarkers of organic anion transporter 1/3 inhibition in cynomolgus monkeys. Drug Metab. Dispos. 51, 844–850 (2023). · DOI
- Schnabolk, G. W., Youngblood, G. L. & Sweet, D. H. Transport of estrone sulfate by the novel organic anion transporter Oat6 (Slc22a20). Am. J. Physiol. Ren. Physiol. 291, F314–F321 (2006). · DOI
- Wu, W. et al. Shared Ligands Between Organic Anion Transporters (OAT1 and OAT6) and Odorant Receptors. Drug Metab. Dispos. 43, 1855–1863 (2015). · DOI
- Kaler, G. et al. Olfactory mucosa-expressed organic anion transporter, Oat6, manifests high affinity interactions with odorant organic anions. Biochem Biophys. Res Commun. 351, 872–876 (2006). · DOI
- Chen, Z. et al. Novel (sulfated) thyroid hormone transporters in the solute carrier 22 family. Eur. Thyroid J. 12, e230023 (2023). · DOI
- Zhu, C. et al. Evolutionary analysis and classification of OATs, OCTs, OCTNs, and Other SLC22 transporters: structure-function implications and analysis of sequence motifs. PLoS One 10, e0140569 (2015). · DOI
- Wegler, C. et al. Drug disposition protein quantification in matched human jejunum and liver from donors with obesity. Clin. Pharm. Ther. 111, 1142–1154 (2022). · DOI
- Wegler, C. et al. Influence of proteome profiles and intracellular drug exposure on differences in CYP activity in donor-matched human liver microsomes and hepatocytes. Mol. Pharm. 18, 1792–1805 (2021). · DOI
- Niu, L. et al. Dynamic human liver proteome atlas reveals functional insights into disease pathways. Mol. Syst. Biol. 18, e10947 (2022). · DOI
- Eide Kvitne, K. et al. Correlations between 4beta-hydroxycholesterol and hepatic and intestinal CYP3A4: protein expression, microsomal ex vivo activity, and in vivo activity in patients with a wide body weight range. Eur. J. Clin. Pharmacol. 78, 1289–1299 (2022). · DOI
- El-Khateeb, E., Al-Majdoub, Z. M., Rostami-Hodjegan, A., Barber, J. & Achour, B. Proteomic quantification of changes in abundance of drug-metabolizing enzymes and drug transporters in human liver cirrhosis: different methods, similar outcomes. Drug Metab. Dispos. 49, 610–618 (2021). · DOI
- Cordes, F. S., Bright, J. N. & Sansom, M. S. Proline-induced distortions of transmembrane helices. J. Mol. Biol. 323, 951–960 (2002). · DOI
- Karczewski, K. J. et al. The mutational constraint spectrum quantified from variation in 141,456 humans. Nature 581, 434–443 (2020). Epub 2020/05/29. PubMed PMID: 32461654; PMCID: PMC7334197 from Takeda Pharmaceutical Company. A.H.O’D.-L. has received honoraria from ARUP and Chan Zuckerberg Initiative. E.V.M. has received research support in the form of charitable contributions from Charles River Laboratories and Ionis Pharmaceuticals, and has consulted for Deerfield Management. J.S.W. is a consultant for MyoKardia. B.M.N. is a member of the scientific advisory board at Deep Genomics and consultant for Camp4 Therapeutics, Takeda Pharmaceutical, and Biogen. M.J.D. is a founder of Maze Therapeutics. D.G.M. is a founder with equity in Goldfinch Bio, and has received research support from AbbVie, Astellas, Biogen, BioMarin, Eisai, Merck, Pfizer, and Sanofi-Genzyme. The views expressed in this article are those of the author(s) and not necessarily those of the NHS, the NIHR, or the Department of Health. M.I.M. has served on advisory panels for Pfizer, NovoNordisk, Zoe Global; has received honoraria from Merck, Pfizer, NovoNordisk and Eli Lilly; has stock options in Zoe Global and has received research funding from Abbvie, Astra Zeneca, Boehringer Ingelheim, Eli Lilly, Janssen, Merck, NovoNordisk, Pfizer, Roche, Sanofi Aventis, Servier & Takeda. As of June 2019, M.I.M. is an employee of Genentech, and holds stock in Roche. N.R. is a non-executive director of AstraZeneca. · DOI · Paper page
- Taliun, D. et al. Sequencing of 53,831 diverse genomes from the NHLBI TOPMed Program. Nature 590, 290–299 (2021). · DOI · Paper page
- Bianchi, D. W. et al. The All of Us Research Program is an opportunity to enhance the diversity of US biomedical research. Nat. Med. 30, 330–333 (2024). · DOI
- Cropp, C. D. et al. Organic anion transporter 2 (SLC22A7) is a facilitative transporter of cGMP. Mol. Pharmacol. 73, 1151–1158 (2008). · DOI
- Maruti, S. S. et al. Dietary and demographic correlates of serum beta-glucuronidase activity. Nutr. Cancer 62, 208–219 (2010). · DOI
- Shin, H. J. et al. Novel liver-specific organic anion transporter OAT7 that operates the exchange of sulfate conjugates for short chain fatty acid butyrate. Hepatology 45, 1046–1055 (2007). · DOI
- Zheng, D. & Gerstein, M. B. The ambiguous boundary between genes and pseudogenes: the dead rise up, or do they? Trends Genet. 23, 219–224 (2007). · DOI · Paper page
- Mighell, A. J., Smith, N. R., Robinson, P. A. & Markham, A. F. Vertebrate pseudogenes. FEBS Lett. 468, 109–114 (2000). · DOI
- Zhang, Z. D., Frankish, A., Hunt, T., Harrow, J. & Gerstein, M. Identification and analysis of unitary pseudogenes: historic and contemporary gene losses in humans and other primates. Genome Biol. 11, R26 (2010). · DOI
- Schnabolk, G. W., Gupta, B., Mulgaonkar, A., Kulkarni, M. & Sweet, D. H. Organic anion transporter 6 (Slc22a20) specificity and Sertoli cell-specific expression provide new insight on potential endogenous roles. J. Pharm. Exp. Ther. 334, 927–935 (2010). · DOI
- Cunningham, F. et al. Ensembl 2022. Nucleic Acids Res. 50, D988–D995 (2022). · DOI · Paper page
- Koleske, M. L. et al. Functional genomics of OCTN2 variants informs protein-specific variant effect predictor for Carnitine Transporter Deficiency. Proc. Natl Acad. Sci. Usa. 119, e2210247119 (2022). · DOI
- Azimi, M. et al. Characterization of P-glycoprotein orthologs from human, sheep, pig, dog, and cat. J. Vet. Pharm. Ther. https://doi.org/10.1111/jvp.13386 (2023). · DOI
- Wisniewski, J. R. & Mann, M. Consecutive proteolytic digestion in an enzyme reactor increases depth of proteomic and phosphoproteomic analysis. Anal. Chem. 84, 2631–2637 (2012). · DOI
- Rappsilber, J., Ishihama, Y. & Mann, M. Stop and go extraction tips for matrix-assisted laser desorption/ionization, nanoelectrospray, and LC/MS sample pretreatment in proteomics. Anal. Chem. 75, 663–670 (2003). · DOI
- Wiśniewski J. R. Label-Free Quantitative Analysis of Mitochondrial Proteomes Using the Multienzyme Digestion-Filter Aided Sample Preparation (MED-FASP) and “Total Protein Approach”. In: Mokranjac D., Perocchi F., editors. Mitochondria Methods in Molecular Biology. New York: Humana Press. 1567, 69–78 (2017). · DOI
- Wisniewski, J. R. & Gaugaz, F. Z. Fast and sensitive total protein and Peptide assays for proteomic analysis. Anal. Chem. 87, 4110–4116 (2015). · DOI
- Tyanova, S., Temu, T. & Cox, J. The MaxQuant computational platform for mass spectrometry-based shotgun proteomics. Nat. Protoc. 11, 2301–2319 (2016). · DOI
- Wisniewski, J. R. & Rakus, D. Multi-enzyme digestion FASP and the ‘Total Protein Approach’-based absolute quantification of the Escherichia coli proteome. J. Proteom. 109, 322–331 (2014). · DOI
- Varadi, M. et al. AlphaFold Protein Structure Database: massively expanding the structural coverage of protein-sequence space with high-accuracy models. Nucleic Acids Res. 50, D439–D444 (2022). · DOI · Paper page
- Lomize, A. L., Todd, S. C. & Pogozheva, I. D. Spatial arrangement of proteins in planar and curved membranes by PPM 3.0. Protein Sci. 31, 209–220 (2022). · DOI
- Frenz, B. et al. Prediction of protein mutational free energy: benchmark and sampling improvements increase classification accuracy. Front Bioeng. Biotechnol. 8, 558247 (2020). · DOI
- Laine, E., Karami, Y. & Carbone, A. GEMME: a simple and fast global epistatic model predicting mutational effects. Mol. Biol. Evol. 36, 2604–2619 (2019). · DOI
- Ke, Y. et al. A rapid and sensitive UPLC-MS/MS method for the simultaneous quantification of serum androsterone glucuronide, etiocholanolone glucuronide, and androstan-3alpha, 17beta diol 17-glucuronide in postmenopausal women. J. Steroid Biochem Mol. Biol. 149, 146–152 (2015). · DOI
- Hinrichs, A. S. et al. The UCSC Genome Browser Database: update 2006. Nucleic Acids Res. 34, D590–D598 (2006). · DOI · Paper page
- Edgar, R. C. MUSCLE: a multiple sequence alignment method with reduced time and space complexity. BMC Bioinforma. 5, 113 (2004). · DOI
- Brown, N. P., Leroy, C. & Sander, C. MView: a web-compatible database search or multiple alignment viewer. Bioinformatics 14, 380–381 (1998). · DOI
- O’Leary, N. A. et al. Reference sequence (RefSeq) database at NCBI: current status, taxonomic expansion, and functional annotation. Nucleic Acids Res. 44, D733–D745 (2016). · DOI · Paper page
- Kuderna, L. F. K. et al. A global catalog of whole-genome diversity from 233 primate species. Science 380, 906–913 (2023). · DOI
- de Manuel, M. et al. Chimpanzee genomic diversity reveals ancient admixture with bonobos. Science 354, 477–481 (2016). · DOI
- Nater, A. et al. Morphometric, behavioral, and genomic evidence for a new orangutan species. Curr. Biol. 27, 3576–3577 (2017). · DOI
- Prado-Martinez, J. et al. Great ape genetic diversity and population history. Nature 499, 471–475 (2013). · DOI
- Genomes Project, C. et al. A global reference for human genetic variation. Nature 526, 68–74 (2015). · DOI · Paper page
- Machiela, M. J. & Chanock, S. J. LDlink: a web-based application for exploring population-specific haplotype structure and linking correlated alleles of possible functional variants. Bioinformatics 31, 3555–3557 (2015). · DOI · Paper page
- Albers, P. K. & McVean, G. Dating genomic variants and shared ancestry in population-scale sequencing data. PLoS Biol. 18, e3000586 (2020). Epub 2020/01/18. PubMed PMID: 31951611; PMCID: PMC6992231 following competing interests: GM is a shareholder in and non-executive director of Genomics PLC, and is a partner in Peptide Groove LLP. PKA is a shareholder in and a director of BioMe Oxford Ltd. · DOI
Metadata
- Authors
- Yee, S. W., Ferrández-Peral, L., Alentorn-Moron, P., Fontsere, C., Ceylan, M., Koleske, M. L., Handin, N., Artegoitia, V. M., Lara, G., Chien, H.-C., Zhou, X., Dainat, J., Zalevsky, A., Sali, A., Brand, C. M., Wolfreys, F. D., Yang, J., Gestwicki, J. E., Capra, J. A., Artursson, P., Newman, J. W., Marquès-Bonet, T., & Giacomini, K. M.
- Affiliations
- University of California, San Francisco (US)
- Barcelona Biomedical Research Park (ES)
- University of Copenhagen (DK)
- Uppsala University (SE)
- Agricultural Research Service (US)
- Centre National de la Recherche Scientifique (FR)
- Corresponding author
- Giacomini, Kathleen M.
- ORCID
- Yee, Sook Wah
- Ferrández-Peral, Luis
- Alentorn-Moron, Pol
- Fontsere, Claudia
- Ceylan, Merve
- Koleske, Megan L.
- Handin, Niklas
- Artegoitia, Virginia M.
- Lara, Giovanni
- Chien, Huan-Chieh
- Zhou, Xujia
- Dainat, Jacques
- Zalevsky, Arthur
- Sali, Andrej
- Brand, Colin M.
- Wolfreys, Finn D.
- Yang, Jia
- Gestwicki, Jason E.
- Capra, John A.
- Artursson, Per
- Newman, John W.
- Marquès-Bonet, Tomàs
- Giacomini, Kathleen M.
- Venue
- Nature Communications
- Published
- 2024-05-23
- Volume
- 15
- Issue
- 1
- Pages
- 4380-4380
- ISSN
- 2041-1723 (ISSN-L)
- PMC
- PMC11116522
- OpenAlex
- W4398239022
- Cited by
- 4
- References
- 8
- Citations by year
- 2026: 1 · 2025: 3
- FWCI
- 0.68
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Nature Communications (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Research at the University of Copenhagen (University of Copenhagen) (publishedVersion, cc-by)
- HAL (submittedVersion, cc-by)
- Dipòsit Digital de Documents de la UAB (Universitat Autònoma de Barcelona) (submittedVersion, cc-by)
- eScholarship (California Digital Library) (submittedVersion, cc-by)
- Uppsala University Publications (Uppsala University) (submittedVersion, other-oa)
- DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- U.S. Department of Health & Human Services | NIH | National Institute of General Medical Sciences (GM139875, GM117163)
- U.S. Department of Health & Human Services | NIH | National Eye Institute (EY032161)
- Topics
- Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
- Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Endocrinology › Estrogen and related hormone effects
- Keywords
- orphan transporter, estradiol-17β-glucuronide, substrate specificity, plasma membrane localization, Neanderthal genome, hominin evolution, pseudogenes, missense mutations, primate comparative genomics
- MeSH terms
- Amino Acid Sequence, Animals, Estradiol, Humans, Primates, Pseudogenes, Substrate Specificity, Hominidae, Mutation, Missense, Organic Anion Transporters, Organic Cation Transport Proteins, HEK293 Cells
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review