ORIGINAL RESEARCH article
RNF213 p.R4810K (c.14429G > A) Variant Determines Anatomical Variations of the Circle of Willis in Cerebrovascular Disease
- 1Department of Neurology, National Cerebral and Cardiovascular Center, Suita, Japan
- 2Department of Cerebrovascular Medicine, National Cerebral and Cardiovascular Center, Suita, Japan
- 3Department of Neurology, Osaka University Graduate School of Medicine, Suita, Japan
- 4Department of Preventive Medicine and Epidemiologic Informatics, National Cerebral and Cardiovascular Center, Suita, Japan
- 5Department of Neurosurgery, Hyogo Prefectural Amagasaki General Medical Center, Amagasaki, Japan
- 6Department of Health and Environmental Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan
- 7Department of Clinical Neuroscience and Therapeutics, Hiroshima University, Hiroshima, Japan
- 8Social Health Medicine Welfare Laboratory, Public Interest Incorporated Association Kyoto Hokenkai, Kyoto, Japan
Introduction: Dysregulation of the RING finger protein 213 (RNF213) gene impairs vascular formation in experimental animal models. In addition, vascular abnormalities in the circle of Willis are associated with cerebrovascular disease. Here, we evaluated the relationship between the East Asian founder variant RNF213 p.R4810K and consequent anatomical variations in the circle of Willis in cerebrovascular disease.
Patients and Methods: The present study is an observational cross-sectional study. It included patients with acute anterior circulation non-cardioembolic stroke admitted to our institution within 7 days of symptom onset or last-known-well from 2011 to 2019, and those who participated in the National Cerebral and Cardiovascular Center Biobank. We compared anatomical variations of the vessels constituting the circle of Willis between RNF213 p.R4810K (c.14429G > A) variant carriers and non-carriers using magnetic resonance angiography and assessed the association between the variants and the presence of the vessels constituting the circle of Willis. Patients with moyamoya disease were excluded.
Results: Four hundred eighty-one patients [146 women (30%); median age 70 years; median baseline National Institutes of Health Stroke Scale score 5] were analyzed. The RNF213 p.R4810K variant carriers (n = 25) were more likely to have both posterior communicating arteries (PComAs) than the variant non-carriers (n = 456) (56% vs. 13%, P < 0.01). Furthermore, variant carriers were less likely to have an anterior communicating artery (AComA) than non-carriers (68% vs. 84%, P = 0.04). In a multivariate logistic regression analysis, the association of RNF213 p.R4810K variant carriers with the presence of both PComAs and the absence of AComA remained significant.
Conclusion: Our findings suggest that the RNF213 p.R4810K variant is an important factor in determining anatomical variations in the circle of Willis.
RING finger protein 213 (RNF213) is a susceptibility gene for large artery atherosclerosis (LAA) (Okazaki et al., 2019) as well as moyamoya disease (MMD), which is a progressive steno-occlusive disease of the circle of Willis (Kamada et al., 2011; Liu et al., 2011). This gene encodes a large protein containing two AAA + ATPases and an E3 ligase domain (Liu et al., 2011; Morito et al., 2014), and plays an important role in regulating vascular endothelial function and angiogenesis (Koizumi et al., 2016). Several studies have revealed that MMD patients in East Asia commonly possess the RNF213 p.R4810K (c.14429G > A) variant (Koizumi et al., 2016). Notably, in Japan, about 90% of MMD patients have this variant, compared with just 2–3% of the general population (Koizumi et al., 2013; Cao et al., 2016). Approximately 20–25% of Japanese patients with intracranial proximal arterial stenosis, but who do not meet the diagnostic criteria for MMD, also have this variant (Miyawaki et al., 2012).
Genetic variants have major effects on the development of cerebral vasculature, as demonstrated in both clinical and experimental studies. Different genetic backgrounds in mice significantly affect flow-mediated outward remodeling in the bilateral posterior communicating arteries (PComAs) after unilateral occlusion of the middle cerebral artery (MCA) (Faber et al., 2019). Moreover, knockdown of RNF213 in zebrafish impairs the formation of the cerebral vasculature. A recent clinical study has also reported that the RNF213 p.R4810K variant is associated with intracranial major artery stenosis or occlusion in anterior cerebral circulation (Matsuda et al., 2017).
We therefore sought to evaluate the relationship between the East Asian founder variant RNF213 p.R4810K, associated with a single nucleotide polymorphism (SNP; rs112735431), and consequent anatomical variations in the circle of Willis in cerebrovascular disease.
Materials and Methods
Study Design and Patients
This observational cross-sectional study was performed at the National Cerebral and Cardiovascular Center (NCVC), Osaka, Japan. The study was conducted in accordance with the Declaration of Helsinki and was approved by the local ethics committees at the NCVC Biobank and Kyoto University. The study was also approved by the Institutional Review Board of NCVC (approval numbers M29-003-9 and M30-145-5). All participants signed a comprehensive consent form at the NCVC.
All patients with ischemic stroke or transient ischemic attack (TIA) who were admitted to our institute within 7 days of symptom onset or last-known-well were prospectively registered to the NCVC Stroke Registry (Yoshimoto et al., 2021). Data for the period from January 2011 to July 2019 were retrospectively reviewed, and patients who met the following criteria were included: (1) admitted with acute anterior circulation non-cardioembolic stroke or TIA; (2) participated in the NCVC Biobank; and, (3) had magnetic resonance imaging (MRI) data available. Patients with MMD were excluded based on diagnostic criteria (Research Committee on the Pathology, and Treatment of Spontaneous Occlusion of the Circle of Willis, and Health Labour Sciences Research Grant for Research on Measures for Intractable Diseases, 2012).
Peripheral blood samples were obtained from all patients. Genomic DNA was extracted from the buffy coat of blood samples using QIAsymphony SP equipment (Qiagen, Hilden, Germany). Genotyping was performed using TaqMan SNP Assays (Applied Biosystems, Foster City, CA, United States) as described previously (Liu et al., 2011). From the RNF213 p.R4810K variant genotype analysis, individuals with the GA variant for p.R4810K or the homozygote AA genotype were defined as variant carriers, while individuals with the wild-type homozygote were defined as variant non-carriers.
MRI was performed using a 3-tesla system (MAGNETOM Verio or Spectra, Siemens, Erlangen, Germany) at admission. Circle of Willis morphology was evaluated by magnetic resonance angiography (MRA) with maximum intensity protection, a method used to reconfigure and prevent overvaluation and overestimation.
The vessels constituting the circle of Willis were defined as follows: (i) the anterior communicating artery (AComA), (ii) the A1 segments of the anterior cerebral arteries (ACAs), (iii) the intracranial internal carotid arteries (ICAs) beyond the PComA bifurcation, (iv) the PComAs, (v) the P1 segments of the posterior cerebral arteries (PCAs), and (vi) the top of the basilar artery (BA) (Figure 1). Intracranial ICA was defined as the ICA from the PComA bifurcation to the top of the ICA.
Figure 1. Vessels constituting the circle of Willis. (i) The AComA, (ii) the A1 segment of the ACAs, (iii) the intracranial ICA beyond the PComA bifurcation, (iv) the PComAs, (v) the P1 segment of the PCAs, and (vi) the top of the BA. ACAs, anterior cerebral arteries; AComA, anterior communicating artery; BA, basilar artery; ICAs, internal carotid arteries; PCAs, posterior cerebral arteries; PComAs, posterior communicating arteries.
Based on the MRA findings, the A1 segments of the ACAs, the intracranial ICAs, the PComAs, and the P1 segments of the PCAs were classified into the presence of both vessels (Figure 2A), a unilateral vessel (Figure 2B), or the absence of both vessels (Figure 2C). The AComA and the top of the BA were classified by the presence and absence of the vessels. The absence of vessels included artery aplasia or hypoplasia (defined as an internal diameter under 1 mm Merkkola et al., 2006). To determine the anatomical variations, the MRA findings of the vessels constituting the circle of Willis and the focal narrowing of the M1 segment of the MCA were independently analyzed by two stroke neurologists (F.E. and T.Y.), who were blind to the clinical information. Joint assessments were carried out for consensus if required.
Figure 2. Presence of both vessels (A), unilateral presence of one vessel (B), and bilateral absence of the vessels (C).
Clinical Data Collection
The baseline clinical characteristics were collected from the NCVC Stroke Registry: sex, age, prestroke modified Rankin Scale (mRS) score, medical history (hypertension, diabetes mellitus, dyslipidemia, ischemic heart disease, and chronic kidney disease), atrial fibrillation, current smoking, systolic blood pressure on admission, baseline National Institutes of Health Stroke Scale (NIHSS) score, Alberta Stroke Program Early Computed Tomographic Score (ASPECTS) on diffusion-weighted imaging (DWI) or computed tomography (CT), the presence of vessels constituting the circle of Willis (AComA, both A1 segments of the ACAs, both intracranial ICAs, and both PComAs), completeness of the circle of Willis, focal narrowing of the M1 segment of the MCA, stroke subtype, and clinical outcome (mRS score at discharge and in-hospital mortality). Hypertension was diagnosed at hospital discharge or from the use of antihypertensive medications before the index stroke/TIA. Diabetes mellitus was diagnosed at hospital discharge or from antidiabetic treatment before the index stroke/TIA. Dyslipidemia was diagnosed at hospital discharge or from lipid-lowering therapy before the index stroke/TIA. A complete circle of Willis was defined by the presence of all of the vessels that constitute the circle of Willis. Stroke subtype, including LAA, small vessel occlusion (SVO), and other/undetermined etiology, was determined by stroke neurologists according to the Trial of ORG 10172 in Acute Stroke Treatment criteria (Adams et al., 1993).
Data are summarized as the median [interquartile range (IQR)] for continuous variables and the frequencies (percentages) for categorical variables. Patients were divided into two groups: RNF213 p.R4810K variant carriers and non-carriers. The clinical characteristics, presence of vessels constituting the circle of Willis, and clinical outcomes were compared between groups using the Mann–Whitney U-test or Fisher’s exact test, as appropriate. We assessed the correlations between anatomical variations of the circle of Willis (both PComAs and AComA) and the RNF213 p.R4810K variant using the following models. For Model 1, a multivariate logistic regression model was created to investigate the association between anatomical variations of the circle of Willis (both PComAs and AComA) and the RNF213 p.R4810K variant. Variables with P < 0.10 (women, age, focal narrowing of the M1 segment of MCA, and stroke subtype) were selected for the multivariate model. For Model 2, associations between anatomical variations of the circle of Willis (both PComAs and AComA) and the RNF213 p.R4810K variant were explored using a multivariate logistic regression model; the stepwise method was used for variable selection. To exclude statistically non-significant variables from the logistic regression model, bidirectional stepwise variable selection was used, with a P-value for entry of 0.05 and a P-value for removal of 0.10. Odds ratios (ORs) with 95% confidence intervals (CIs) were also calculated. We also analyzed the intraclass correlation coefficients for the evaluation of vessels constituting the circle of Willis.
The enrolled patients were then divided into three groups according to stroke subtype (LAA, SVO, and other/undetermined etiology). Baseline characteristics, including the presence of vessels constituting the circle of Willis, were compared. We evaluated the associations between the presence of vessels constituting the circle of Willis and the stroke subtype. All analyses were performed using JMP 14.0.0 statistical software (SAS Institute Inc., Cary, NC, United States).
The study flow chart is provided in Figure 3. From January 2011 to July 2019, 7823 patients were enrolled in the NCVC Stroke Registry. Of these, 481 patients [146 (30%) women, median (IQR) age of 70 (57–78) years] met our study criteria. Patients were excluded because of acute intracerebral hemorrhage (n = 1785), acute cardioembolic stroke (n = 2620), non-participants at the NCVC Biobank (n = 2919), non-availability of MRI (n = 6), and MMD cases (n = 12). Of the 481 patients [146 women (30%); median (IQR) age 70 (57–78) years, median NIHSS score 5 (2–5)] enrolled in the present study, 25 patients (5.2%) had the GA variant for p.R4810K and no patients had the homozygote AA genotype. The most common comorbidities were hypertension (80%) and dyslipidemia (68%). Forty-nine patients (11%) had a complete circle of Willis. The median (IQR) mRS score at discharge was 1 (1–3) and the in-hospital mortality rate was 0.4%. The distributions of ASPECTS on DWI or CT and mRS scores at discharge in variant carriers and non-carriers are shown in Figure 4.
Figure 3. Study flow chart. Patients were excluded based on acute intracerebral hemorrhage (n = 1,785), acute cardioembolic stroke (n = 2,620), non-participants at the NCVC Biobank (n = 2,919), non-availability of MRI (n = 6), and MMD cases (n = 12). MMD, moyamoya disease; MRI, magnetic resonance imaging; NCVC, National Cerebral, and Cardiovascular Center; TIA, transient ischemic attack.
Compared with RNF213 p.R4810K (c.14429G > A) non-carriers (n = 456), carriers (n = 25) were more frequently women (52% vs. 29%, P = 0.02), younger (62 years vs. 70 years, P < 0.01), had focal narrowing of the M1 segment of the MCA (44% vs. 12%, P < 0.01), had a lower presence of AComA (68% vs. 84%, P = 0.04), and a higher presence of both PComAs (56% vs. 13%, P < 0.01). The baseline characteristics of RNF213 p.R4810K variant carriers and non-carriers are shown in Table 1. Compared with patients with the unilateral presence or absence of PComAs (n = 406), patients with the presence of both PComAs (n = 75) were more frequently women (41% vs. 28%, P = 0.03), younger (median 62 years vs. 71 years, P < 0.01), less hypertensive (69% vs. 82%, P = 0.02), had more focal narrowing of the M1 segment of the MCA (26% vs. 12%, P = 0.02), and more frequently RNF213 p.R4810K variant carriers (19% vs. 3%, P < 0.01). In the multivariate analysis using the stepwise model (Model 2), patients having both PComAs were more frequently younger (per 1-year increase; OR 0.71, 95% CI 0.59–0.85) and were significantly associated with the variant (OR 8.61, 95% CI 3.48–21.31). The patient baseline characteristics, stratified according to PComA patency state, are shown in Table 2. Two models were used to evaluate the associations between PComAs patency state and the factors shown in Table 3. Compared with patients with AComA (n = 401), those without AComA (n = 80) were older (median 75 years vs. 69 years, P = 0.03), and more frequently the variant carriers (11% vs. 4%, P = 0.04). In the multivariate analysis using the stepwise model (Model 2), the absence of AComA were also significantly associated with the variant (OR 2.38, 95% CI 1.02–5.88), as shown in Tables 4, 5. There were no associations between the other vessels constituting the circle of Willis and the RNF213 p.R4810K variant.
Table 1. Baseline characteristics between RNF213 p.R4810K (c.14429G > A) variant carriers and non-carriers.
The intraclass correlation coefficients for the evaluation of vessels constituting the circle of Willis were as follows: 0.97 (95% CI 0.97–0.98) for AComA, 0.98 (95% CI 0.98–0.99) for both A1 segments of the ACAs, 1.00 for both intracranial ICAs, 1.00 for the top of the BA, 0.97 (95% CI 0.97–0.98) for both PComAs, and 0.96 (95% CI 0.95–0.97) for both P1 segments of the PCAs.
There were no significant differences in the vessels constituting the circle of Willis for each stroke subtype, except that the presence of AComA was significantly higher in patients with SVO (LAA 89% vs. SVO 92% vs. other/undetermined etiology 79%, P < 0.01). Moreover, the frequency of RNF213 p.R4810K variant carriers were significantly higher in patients with LAA (LAA 10% vs. SVO 4% vs. other/undetermined etiology 2%, P < 0.01). A comparison of the baseline characteristics by stroke subtype is shown in Supplementary Table 1, in the online-only Data Supplement.
The current study provides relevant new data about the associations between vessels constituting the circle of Willis and the RNF213 p.R4810K variant carrier state. Our results indicate that the East Asian founder variant of RNF213 affects the vascular formation of the circle of Willis. RNF213 p.R4810K variant carriers had a higher frequency of the presence of both PComAs and the absence of AComA compared with non-carriers, even after adjusting for differences in baseline characteristics using a stepwise method. These findings reinforce the idea of anterior cerebral circulation failure even in RNF213 p.R4810K variant carriers who do not satisfy the diagnostic criteria for MMD (Research Committee on the Pathology, and Treatment of Spontaneous Occlusion of the Circle of Willis, and Health Labour Sciences Research Grant for Research on Measures for Intractable Diseases, 2012). To our knowledge, no other SNPs have been reported to be associated with such substantial anatomical variations in the circle of Willis as in the current findings for the RNF213 p.R4810K variant.
In terms of the variation of vessels constituting the circle of Willis, a previous study evaluated the intracranial arterial morphology of healthy subjects and reported that 21% (110/525) had an absence of AComA, 19% (100/525) had both PComAs, and 20.9% had a complete circle of Willis; however, the RNF213 p.R4810K variant was not examined in this study (Kondori et al., 2017). In the variant carriers in the present study, the rate of absence of AComA was 32% (8/25), the rate of both PComAs was 56% (14/25), and a complete circle of Willis was present in 20% (5/25) of individuals. Thus, compared with the healthy subjects in the previous report (Kondori et al., 2017), our results showed higher rates of an absence of AComA and the presence of both PComAs in variant carriers. These results suggest that this variant affects anatomical variations in the circle of Willis. In the variant non-carriers, the rate of a complete circle of Willis was very low, at 9% (43/456), and the presence of both PComAs was only 13% (61/453); these findings likely reflect the fact that our study included only patients with a history of ischemic stroke/TIA.
In a previous study examining sex differences in stroke (Arboix et al., 2014), women generally had more stroke events at an older age and a higher number of stroke events than men because of a longer life expectancy. In the present study, although patients with the RNF213 p.R4810K variant were more frequently women and younger, as previously reported (Kamimura et al., 2019; Okazaki et al., 2019), there were no differences in clinical outcomes, including mRS score at discharge and in-hospital mortality. To clarify the impact of this variant on clinical outcomes, long-term outcomes should be investigated in future research.
Advanced MMD is characterized by the discontinuity or disappearance of PComAs in Suzuki staging (Jin et al., 2011), probably as a result of arteriopathy extending proximally into these vessels. This seems to contradict our finding that variant carriers had increased patency of PComAs. However, this inconsistency may be explained by the different stages of RNF213-related vasculopathy between variant carriers with advanced MMD and those with sporadic ischemic stroke or TIA in our cohort (Okazaki et al., 2019; Hosoki et al., 2021), which excluded MMD. That is, patients with advanced MMD, who represent the extreme end of the disease spectrum of RNF213-related vasculopathy, have terminal ICA stenosis or occlusion. Anterior circulation insufficiency no longer activates compensatory mechanisms for collateral flow because of the arteriopathy of PComAs. In contrast, patients on the less severe end of the RNF213-related vasculopathy spectrum may still have activation of the mechanisms that compensate for insufficient anterior circulation through the PComAs, PCAs, and meningeal arteries (Song et al., 2019). Both the continuity and differences between MMD and non-moyamoya ischemic stroke in the same variant carriers should be further clarified to establish and stratify treatment strategies for RNF213-related vasculopathy.
Another explanation of PComA patency may be attributable to the embryonic development of cerebral circulation. In the embryonic stage, the neural crest gives rise to pericytes, thereby contributing to the formation of anterior cerebral circulation, which specifically includes primitive ICAs but not the vertebrobasilar arteries of mesodermal origin (Komiyama, 2017a). Therefore, failures in the differentiation and migration of neural crest cells may lead to the insufficiency of anterior cerebral circulation, including MMD, multisystemic smooth muscle dysfunction syndrome caused by ACTA2 mutation, and PHACE syndrome, which are collectively named vascular neurocristopathy (cardio-cephalic neural crest syndrome) (Komiyama, 2017b). Thus, anatomical variations of the circle of Willis in variant carriers may not be acquired, but might be primarily determined in the embryonic stage. Additional studies in healthy carriers or other ischemic stroke and TIA cohorts are required to determine precisely when the RNF213 p.R4810K variant leads to the observed arterial variations. This gene polymorphism may also be involved in the relationship between cerebrovascular pathology and Alzheimer’s disease (AD) because vascular abnormalities affect the accumulation of amyloid protein and the progression of behavioral abnormalities in both AD patients and animal models (Farkas and Luiten, 2001). Another report (Roher et al., 2003) has demonstrated a relationship between circle of Willis atherosclerosis and AD, thus strengthening the importance of cerebrovascular architecture in AD.
There are several limitations in the present study. The first and major limitation was the lack of genetic and neuroimaging data from healthy volunteers, which was the result of ethical and procedural issues. Because only patients with previous ischemic stroke/TIA were enrolled in this study, it will be necessary to evaluate healthy subjects in a future validation cohort. Second, the anatomical variations of intracranial arteries were evaluated by MRA in the current study. Digital subtraction angiography is the gold standard technique and is superior to MRA in the evaluation of cerebrovascular architecture, although MRA has an advantage as a non-invasive imaging modality. Third, only 14% of patients enrolled in the study gave full consent for their data to be collected and stored at the NCVC Biobank; such selection bias may have led to an overestimation of the prevalence of the RNF213 p.R4810K variant. Fourth, although a previous whole-genome microarray analysis demonstrated associations between RNF 213 polymorphisms and AD (Bai et al., 2014), cognitive status was not evaluated in the present study because the cerebrovascular disease affects cognitive function, and thus makes the diagnosis of AD difficult in an acute stroke setting. However, the results of the current study may stimulate future exploration of the association between AD and the RNF 213 p.R4810K variant. Finally, we were unable to entirely rule out acquired changes in intracranial arteries caused by atherosclerosis. However, the association between the presence of both PComAs and the RNF213 variant remained even after adjusting for baseline factors using the stepwise method.
RNF213 p.R4810K variant carriers had higher rates of the presence of both PComAs and an absence of AComA than non-carriers. In variant carriers, an insufficiency of anterior cerebral circulation arteries may be accompanied by compensatory collateral flow through the PComAs, thus affecting the anatomy of the circle of Willis.
Data Availability Statement
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.
The studies involving human participants were reviewed and approved by the National Cerebral and Cardiovascular Center Biobank and Kyoto University. The patients/participants provided their written informed consent to participate in this study.
FE wrote the first draft of the manuscript, evaluated MRA findings, performed the statistical analysis, and interpreted the data. TY revised the draft of the manuscript, evaluated the MRA findings, provided advice on the statistical analysis, and interpreted the data. KN provided advice on the statistical analysis. SOk, SOg, EY, KF, SS, KW, MK, KT, and HM critically revised the article for important intellectual content. TM and AK supported the genotyping from peripheral blood samples and critically revised the article for important intellectual content. MI designed the study, interpreted the data, and wrote the final draft of the manuscript. All authors contributed to the article and approved the submitted version.
This study was supported by the Japan Agency for Medical Research and Development (Grant No. 19ek0210120h0001) and the SENSHIN Medical Research Foundation.
Conflict of Interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
We thank Ahmad Khundakar for his intellectual input and article editing. We also thank Bronwen Gardner, from Edanz (https://jp.edanz.com/ac) for editing a draft of this manuscript. This research was performed using samples acquired from the National Center Biobank Network/NCVC Biobank resource. For further details see http://www.ncbiobank.org/ and http://www.ncvc.go.jp/biobank/.
The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fnagi.2021.681743/full#supplementary-material
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Keywords: RNF213 p.R4810K, the circle of Willis, cerebral circulation, magnetic resonance angiography, single nucleotide polymorphism
Citation: Eto F, Yoshimoto T, Okazaki S, Nishimura K, Ogura S, Yamaguchi E, Fukuma K, Saito S, Washida K, Koga M, Toyoda K, Morimoto T, Maruyama H, Koizumi A and Ihara M (2021) RNF213 p.R4810K (c.14429G > A) Variant Determines Anatomical Variations of the Circle of Willis in Cerebrovascular Disease. Front. Aging Neurosci. 13:681743. doi: 10.3389/fnagi.2021.681743
Received: 17 March 2021; Accepted: 21 June 2021;
Published: 15 July 2021.
Edited by:Stefano Tarantini, University of Oklahoma Health Sciences Center, United States
Reviewed by:Raluca Pascalau, Johns Hopkins University, United States
Adria Arboix, Sacred Heart University Hospital, Spain
Copyright © 2021 Eto, Yoshimoto, Okazaki, Nishimura, Ogura, Yamaguchi, Fukuma, Saito, Washida, Koga, Toyoda, Morimoto, Maruyama, Koizumi and Ihara. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Masafumi Ihara, firstname.lastname@example.org
†These authors have contributed equally to this work