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Review

Association between ABCA1 Gene Polymorphisms and Plasma Lipid Concentration: A Systematic Review and Meta-Analysis

by
Sun-Young Shim
1,2,†,
Ha-Young Yoon
1,†,
Jeong Yee
1,
Ji-Min Han
3,* and
Hye-Sun Gwak
1,2,*
1
College of Pharmacy and Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul 03760, Korea
2
Graduate School of Clinical Biohealth, Ewha Womans University, Seoul 03760, Korea
3
College of Pharmacy, Chungbuk National University, Cheongju-si 28160, Chungcheongbuk-do, Korea
*
Authors to whom correspondence should be addressed.
†
The authors equally contributed to this work.
J. Pers. Med. 2021, 11(9), 883; https://doi.org/10.3390/jpm11090883
Submission received: 25 July 2021 / Revised: 25 August 2021 / Accepted: 26 August 2021 / Published: 3 September 2021
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Abstract

:
Background: Although ABCA1 gene polymorphisms may be associated with the plasma lipid concentration, the literature has not shown a consistent pattern. In this study, we attempted to elucidate the association between the ABCA1 69C>T, 825V>I, and 230R>C polymorphisms and the plasma lipid concentration through a systematic review and meta-analysis. Methods: We selected studies published up to October 2020 in the PubMed, Web of Science, and Embase databases according to inclusion and exclusion criteria. The mean difference (MD) and 95% confidence interval (CI) were used to assess the relationship between the presence of ABCA1 69C>T, 825V>I, and 230R>C and plasma lipid levels. Meta-analysis was performed using Review Manager (version 5.3). Both Begg’s test and Egger’s regression test of the funnel plot were performed using R Studio software (version 3.6.0) to identify publication bias. Results: We analyzed the data on the ABCA1 69C>T polymorphism involving 14,843 subjects in 11 studies, 825V>I polymorphism involving 2580 subjects in 5 studies, and 230R>C polymorphism involving 4834 subjects in 4 studies. The T allele carriers in 69C>T, II carriers in 825V>I, and C carriers in 230R>C had lower high-density lipoprotein cholesterol levels; the MD (95% CI) was −0.05 mmol/L (95% CI: −0.09 to −0.01, p = 0.02), −0.05 mmol/L (95% CI: −0.09 to −0.00, p = 0.03), and −0.1 mmol/mL (95% CI: −0.12 to −0.07 mmol/L, p < 0.00001), respectively. In the case of 230R>C, the serum total cholesterol concentration of C carriers was significantly lower than that of RR carriers (−0.2 mmol/L, 95% CI: −0.3 to −0.11, p < 0.0001). Conclusion: This meta-analysis demonstrates that the ABCA1 69C>T, 825V>I, and 230R>C polymorphisms could affect the plasma lipid concentration. As the plasma lipid concentration may be related to various diseases, ABCA1 genotyping could be useful for the management of lipid levels.
Keywords:
ABCA1; 69C>T; 825V>I; 230R>C; lipid

1. Introduction

Coronary heart disease (CHD) is a common disease with high morbidity and mortality [1]. Although multiple factors affect the development of CHD, dyslipidemia is known to be one of the most important factors for CHD development [2]. Dyslipidemia refers to a condition in which total cholesterol (TC), triglyceride (TG), and low-density lipoprotein cholesterol (LDL-C) levels are increased or high-density lipoprotein cholesterol (HDL-C) levels are decreased due to abnormal lipoprotein metabolism.
ATP-binding cassette transporter A1 (ABCA1) is a cell membrane transport protein composed of 2261 amino acids. One of its main functions is to promote the efflux of cellular cholesterol and phospholipids [3]. They combine with extracellular apolipoproteins, forming incipient HDL-C. This is the first step of the reverse cholesterol transport process which transports and removes cholesterol and phospholipids from peripheral cells back to the liver, through which ABCA1 is involved in cholesterol homeostasis [4,5,6]. ABCA1 is also known to affect the plasma concentration of HDL-C [7]. A previous observational study showed that a 50% increase in ABCA1-mediated cholesterol efflux caused a 30% increase in the concentration of HDL-C, thus resulting in a decreased incidence of coronary artery disease (CAD) by 50% [8].
The ABCA1 gene is a highly polymorphic gene located on chromosome 9 [9]. Since polymorphism refers to variations of a particular DNA sequence, a polymorphic gene can result in the production of an abnormal protein by altering the amino sequence; the variant protein may lead to its abnormal function or a change in its activity [10,11]. Some mutations of ABCA1 have been found in the intron, exon, or promoter region, which can affect the function of ABCA1. Defects in the reverse cholesterol transport process caused by ABCA1 genetic mutations can cause Tangier’s disease or familial HDL deficiency by reducing HDL-C levels [12].
Several studies have demonstrated the relationship between ABCA1 genetic polymorphisms and the plasma lipid concentration, including ABCA1 69C>T, 825V>I, and 230R>C [9,13,14,15]. Although most mutations are located in introns, ABCA1 69C>T is located in the 5ʹ untranslated region, and 825V>I and 230R>C are missense mutations; thus, they may have a greater effect on the expression and function of ABCA1. However, previously published studies on the relationship between these ABCA1 gene polymorphisms and the plasma lipid concentration showed inconsistent results.
Therefore, the aim of this study was to investigate the correlation between the plasma lipid concentration and the ABCA1 69C>T, 825V>I, and 230R>C polymorphisms through a systematic review and meta-analysis of previous studies.

2. Methods and Materials

2.1. Literature Search Strategy and Inclusion Criteria

This meta-analysis was conducted according to the checklist outlined in the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) [16]. Two reviewers independently searched for studies published up to 16 October 2020. An extensive search of electronic databases (PubMed, Web of Science, and Embase) was performed using the following search terms: {ABCA1 OR (ATP-binding cassette transporter 1) OR (ATP-binding cassette transporter A1) OR (adenosine triphosphate-binding cassette transporter A1) OR (ATP Binding Cassette Sub Family A Member 1) OR (ATP Binding Cassette Transporter, Subfamily A)} AND (polymorph* OR variant* OR mutation* OR genotyp* OR allele* OR SNP*) AND {Dyslipidemia OR dyslipidemias OR HDL OR (high density lipoprotein) OR LDL OR (low density lipoprotein) OR triglyceride}.
Studies were included if they evaluated the relationship of ABCA1 69C>T, 825V>I, and 230R>C with the lipid levels (mmol/L) of adults. The language of the articles was limited to English. Studies were excluded if (i) they were editorials, notes, abstracts, reviews, comments, letters, news, or editorials; (ii) they were in vitro or in vivo studies; (iii) extraction of the data was not possible; or (iv) sample size was less than 20. If there were overlapping data, only the most recent and comprehensive data were included in the meta-analysis.

2.2. Data Extraction and Study Quality Assessment

Two reviewers extracted the data independently, and discrepancies were resolved by consensus. Extracted data included the following information: name of the first author, publication year, country, disease, study design, number of subjects, mean age, percentage of females, genotyping method, studied lipid types, and lipid levels by genotype.
Two researchers independently assessed the selected studies based on the Newcastle–Ottawa scale (NOS) for cohort studies and case–control studies [17]. The NOS has three categories: selection of study sample, comparability between the case and control groups, and outcome or exposure assessment. Each study can be assessed with a total score of 0–9. In this review, we rated 1 point for each item of comparability, if age and other known risk factors (such as body mass index (BMI)) were matched or adjusted for in the analysis.

2.3. Statistical Analysis

Meta-analysis was performed using Review Manager (version 5.3; The Cochrane Collaboration, Copenhagen, Denmark). The mean difference (MD) and 95% confidence interval (CI) were used to assess the relationship between the presence of ABCA1 69C>T, 825V>I, and 230R>C and lipid levels. For studies reporting only medians and interquartile ranges, we retrieved the mean and variance values from the authors of the original reports or used appropriate formulas to calculate the mean and variance, making no assumption on the distribution of the underlying data [18]. The unit “mmol/L” was used for all lipid variables in the meta-analysis, and unit conversion was conducted for articles in which other units were used.
The heterogeneity across studies was estimated by the chi-square test and I2 statistic. An I2 value of ≥50% was considered to indicate significant heterogeneity. The selection of the proper effect model was based on the analysis results; the fixed effect model was used if I2 < 50%, and the random effect model was used if I2 ≥ 50% [19]. Both Begg’s test and Egger’s regression test of the funnel plot were performed using R Studio software (version 3.6.0; R Foundation for Statistical Computing, Vienna, Austria) to identify publication bias [20,21]. A p-value < 0.05 was considered statistically significant.

3. Results

3.1. Characteristics of the Eligible Studies

A detailed flow chart of the study selection process is presented in Figure 1. A total of 2758 studies were identified from searching three databases. After the removal of 1331 duplicates, 1427 records were initially identified, and the titles and abstracts were screened based on the inclusion criteria of the study. From this initial review, 186 studies were selected for full-text review and assessed for eligibility. Following manual screening, one article was added. Of these studies, 169 studies were excluded for the following reasons: data were on other polymorphisms (n = 73); there was no ABCA1 polymorphism-grouped lipid outcome (n = 52); there was no lipid outcome (n = 19); the study was not a clinical trial (n = 10); the sample size was less than 20 (n = 8); the study involved children (n = 4); there was an overlapping cohort (n = 2); the study was not in English (n = 1). Therefore, 18 articles were identified for this systematic review [13,14,15,22,23,24,25,26,27,28,29,30,31,32,33,34,35].
The characteristics of the included studies are presented in Table 1. The studies were published from 2005 to 2020. There were eight cohort studies, nine case–control studies, and one cross-sectional study; the NOS score was between 5 and 7.

3.2. Association of the ABCA1 Gene with Plasma Lipid Concentration

To evaluate the association of ABCA1 69C>T with the plasma lipid concentration, 11 studies with a total of 14,843 subjects were included in the meta-analysis. As shown in Figure 2A, T allele carriers (CT+TT) had a lower HDL-C concentration of 0.05 mmol/L (95% CI: −0.09 to −0.01, p = 0.02) compared with the concentration of wild-type homozygote carriers (CC). High heterogeneity was detected among the studies (I2 = 91%; p < 0.00001). There were no significant differences in LDL-C, TG, and TC levels between genotypes (Figure 2B, Figure 2C, and Figure 2D, respectively). Neither Begg’s test nor Egger’s test showed significant publication bias in all lipid levels except for HDL-C (p = 0.024 and p = 0.071 for Begg’s test and Egger’s test, respectively; Supplementary Figure S1).
To evaluate the association of ABCA1 825V>I with the plasma lipid concentration, 5 studies with a total of 2580 subjects were included in the meta-analysis. As shown in Figure 3A, subjects with the II genotype had a lower HDL-C concentration of 0.05 mmol/L (95% CI: −0.09 to −0.00, p = 0.03) compared with the concentration of subjects with the VI and VV genotypes based on a meta-analysis of five studies. Low heterogeneity was observed (I2 = 14%; p = 0.32). The association between the 825V>I polymorphism and plasma LDL-C, TG, and TC levels was not statistically significant (Figure 3B, Figure 3C, and Figure 3D, respectively). No publication bias was detected when using Begg’s test and Egger’s test in all lipid levels (Supplementary Figure S2).
To evaluate the association of ABCA1 230R>C with the plasma lipid concentration, 4 studies with a total of 4834 subjects were included in the meta-analysis. As shown in Figure 4A, variant C carriers had a lower HDL-C concentration of 0.1 mmol/L (95% CI: −0.12 to −0.07, p < 0.00001) compared with the concentration of non-carriers. Low heterogeneity was observed among the studies (I2 = 23%; p = 0.27). The TC concentration of variant C carriers was significantly lower than that of wild-type homozygote carriers (RR) by 0.2 mmol/L (95% CI: −0.3 to −0.11, p < 0.0001) (Figure 4D). No heterogeneity was observed among the studies (I2 = 0%; p = 0.66). There were no differences in LDL-C and TG levels between genotypes (Figure 4B and Figure 4C, respectively). Publication bias was not detected when using Begg’s test and Egger’s test except for HDL-C (p = 0.0415 and p = 0.204 for Begg’s test and Egger’s test, respectively; Supplementary Figure S3).

4. Discussion

This meta-analysis showed that the T allele carriers in 69C>T, II carriers in 825V>I, and C carriers in 230R>C had significantly lower HDL-C levels. In the 230R>C polymorphism, TC levels were significantly lower among C carriers compared with wild-type homozygote carriers.
ABCA1 transfers excess intracellular cholesterol and phospholipids to apolipoprotein AI, producing an early form of HDL-C [5]. This initial form of HDL-C exhibits cardiovascular protective effects by mediating a reverse transport process that exchanges cholesterol for TGs, followed by transport to the liver [6,36,37]. A prospective observational study reported that an increase of 1 mg/dL (0.026 mmol/L) in HDL-C levels reduced the risk of CHD by 2–3% [38].
The results of our meta-analysis are consistent with those of previous studies on the risk of developing lipid-related diseases such as atherosclerosis (AS) and CAD, in which abnormal lipid levels are the main cause of the diseases. The relationship between the 69C>T polymorphism and AS was examined in a previous study [39]. This meta-analysis involving a sample size of approximately 20,000 subjects reported an increased risk of AS for mutant T carriers (CT+TT) compared with wild-type homozygote carriers; however, this study did not directly compare gene polymorphisms with plasma lipid levels. Nevertheless, considering that abnormalities in plasma lipid levels are the main cause of AS, their result is consistent with ours.
In the case of the 825V>I polymorphism, the aforementioned study failed to show a significant association with the development of AS; this is different from the results of our study, in which the level of HDL-C was significantly lower in II genotype carriers than in VI and VV genotype carriers [39]. However, subgroup analysis, which was performed on subjects with CAD only, showed a significant correlation; this suggests that although ABCA1 gene polymorphisms may play different roles in different atherosclerotic diseases, they can be related to the onset of AS.
Analysis of ABCA1 230R>C revealed that C carriers had both lower HDL-C and lower TC plasma levels compared with the levels of non-carriers in our study, which were controversial in explaining the association of ABCA1 polymorphisms and the development of lipid-related diseases such as AS and CAD. Similar results were also reported in a previous study conducted in Mexico on the association between the 230R>C polymorphism and early CAD [40]. Participants with variant C showed a lower risk of developing CAD and had lower HDL-C and TC levels. This inconsistency may be attributed to the various functions of ABCA1 in each cell [5]. As ABCA1 is involved not only in cholesterol export but also in inflammation and platelet function, the ABCA1 230R>C polymorphism may also affect other functions, thus contributing to the inconsistency between lipid levels and the risk of developing lipid-related diseases [41,42].
This study is the first meta-analysis to reveal an association between ABCA1 gene polymorphisms (69C>T, 825V>I, and 230R>C) and abnormal lipid levels. However, this study has several limitations. First, this study did not consider that there may be differences in the plasma lipid concentration of patients with underlying diseases such as familial hypercholesterolemia or diabetes mellitus. Second, only published studies in English were included. Lastly, in addition to genetic factors, various risk factors that can affect the plasma lipid concentration (gender, body weight, ethnicity, environment, etc.) were not considered.

5. Conclusions

This meta-analysis demonstrates that ABCA1 gene polymorphisms (69C>T, 825V>I, and 230R>C) may be associated with lower HDL-C levels. In addition, a significant association was found between the 230R>C polymorphism and lower TC levels. To the best of our knowledge, this is the first meta-analysis to show an association between the ABCA1 69C>T, 825V>I, and 230R>C polymorphisms and the plasma lipid concentration. Further studies with a large population and analysis of related risk factors are needed to confirm our findings.

Supplementary Materials

The following are available online at https://www.mdpi.com/article/10.3390/jpm11090883/s1, Figure S1: Funnel plots demonstrating the association between ABCA1 69C>T polymorphisms and lipid levels (mmol/L). (A) High-density lipoprotein cholesterol; (B) low-density lipoprotein cholesterol; (C) triglycerides; (D) total cholesterol, Figure S2: Funnel plots demonstrating the association between ABCA1 825V>I polymorphisms and lipid levels (mmol/L). (A) High-density lipoprotein cholesterol; (B) low-density lipoprotein cholesterol; (C) triglycerides; (D) total cholesterol, Figure S3: Funnel plots demonstrating the association between ABCA1 230R>C polymorphisms and lipid levels (mmol/L). (A) High-density lipoprotein cholesterol; (B) low-density lipoprotein cholesterol; (C) triglycerides; (D) total cholesterol.

Author Contributions

Conceptualization, S.-Y.S., H.-Y.Y., J.-M.H. and H.-S.G.; methodology, S.-Y.S., H.-Y.Y., J.-M.H. and H.-S.G.; software, H.-Y.Y.; validation, S.-Y.S.; formal analysis, H.-Y.Y., J.Y. and S.-Y.S.; investigation, J.Y.; data curation, J.Y.; writing—original draft preparation, S.-Y.S. and H.-Y.Y.; writing—review and editing, J.-M.H. and H.-S.G.; visualization, S.-Y.S. and H.-Y.Y.; supervision, J.-M.H. and H.-S.G.; project administration, H.-S.G. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

Not applicable.

Data Availability Statement

No new data were created in this study. Data sharing is not applicable to this article.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Flow diagram of study inclusion.
Figure 1. Flow diagram of study inclusion.
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Figure 2. Forest plots demonstrating the association between the ABCA1 69C>T polymorphism and lipid level (mmol/L). (A) High-density lipoprotein cholesterol; (B) low-density lipoprotein cholesterol; (C) triglycerides; (D) total cholesterol.
Figure 2. Forest plots demonstrating the association between the ABCA1 69C>T polymorphism and lipid level (mmol/L). (A) High-density lipoprotein cholesterol; (B) low-density lipoprotein cholesterol; (C) triglycerides; (D) total cholesterol.
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Figure 3. Forest plots demonstrating the association between the ABCA1 825V>I polymorphism and lipid level (mmol/L). (A) High-density lipoprotein cholesterol; (B) low-density lipoprotein cholesterol; (C) triglycerides; (D) total cholesterol.
Figure 3. Forest plots demonstrating the association between the ABCA1 825V>I polymorphism and lipid level (mmol/L). (A) High-density lipoprotein cholesterol; (B) low-density lipoprotein cholesterol; (C) triglycerides; (D) total cholesterol.
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Figure 4. Forest plots demonstrating the association between the ABCA1 230R>C polymorphism and lipid level (mmol/L). (A) High-density lipoprotein cholesterol; (B) low-density lipoprotein cholesterol; (C) triglycerides; (D) total cholesterol.
Figure 4. Forest plots demonstrating the association between the ABCA1 230R>C polymorphism and lipid level (mmol/L). (A) High-density lipoprotein cholesterol; (B) low-density lipoprotein cholesterol; (C) triglycerides; (D) total cholesterol.
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Table
Table 1. Characteristics of ABCA1 69C>T, 825V>I, and 230R>C studies included in the systematic review.
Table 1. Characteristics of ABCA1 69C>T, 825V>I, and 230R>C studies included in the systematic review.
First Author, YearCountryDiseaseStudy DesignParticipants
(Female %)		Age (Years)
(Mean ± SD)		BMI (kg/m2)
(Mean ± SD)		GenotypingStudied LipidNOS
69C>T
Hodoğlugil, 2005Turkey-Cohort study2700 (42.6)41.0 ± 12.925.9 ± 4.5RFLP, ASOHDL-C7
Porchay, 2006FranceIRSCohort study5040 (51.0)46.8 ± 10.024.7 ± 3.8PCRHDL-C6
Abellán, 2010Spain-Cohort study1367 (50.7)52.7 ± 18.926.3 ± 4.2Oligo-ligation assay/PCR technologyHDL-C, LDL-C, TC7
Versmissen, 2011NetherlandsFHCohort study1686 (53.1)39.1 ± 12.825.0 ± 3.5PCR, immobilized probe assayHDL-C, LDL-C, TG, TC7
Ergen, 2012TurkeyT2DM, healthyCase–control study157 (56.1)54.7 ± 12.227.1 ± 4.9PCR-RFLPHDL-C, LDL-C, TG, TC7
Alharbi, 2013Saudi ArabiaT2DM, healthyCase–control study756 (43.5)48.3 ± 9.129.3 ± 5.7PCR-RFLPHDL-C, LDL-C, TG, TC6
Haghvirdizadeh, 2015MalaysiaT2DM, healthyCase–control study329 (42.2)58.5 ± 10.727.5 ± 5.7PCR-HRMHDL-C, LDL-C, TG, TC5
Li, 2018ChinaT2DM, healthyCase–control study1122 (42.0)55.2 ± 11.725.7 ± 4.7MALDI-TOF MSHDL-C, LDL-C, TC7
Du, 2020ChinaT2DMCase–control study996 (50.2)60.2 ± 8.626.4 ± 3.2PCR, SNaPshotHDL-C, LDL-C7
Ghafar, 2020EgyptT2DMCase–control study104 (62.5)49.7 ± 9.029.2 ± 4.1TaqMan real-time PCRHDL-C, LDL-C, TG, TC7
Yan, 2020ChinaT2DMCase–control study1086 (51.7)58.8 ± 9.726.8 ± 3.5SNaPshotHDL-C, LDL-C7
825V>I
Saleheen, 2007Pakistan-Cohort study200 (36.0)49.4 ± 5.0NAPCR-RFLPHDL-C6
Wang, 2010ChinaACI, LI, healthyCase–control study476 (34.0)65.6 ± 10.524.1 ± 2.6PCR-RFLPHDL-C, LDL-C, TG, TC7
Cao, 2011China-Cohort study1323 (52.1)40.5 ± 16.222.2 ± 2.8PCR-RFLPHDL-C, LDL-C, TG, TC7
Kolovou, 2015Greece-Cohort study432 (80.0)29.8 ± 6.526.0 ± 4.7PCR-RFLPHDL-C, LDL-C, TG, TC6
Dakhil, 2019IraqT2DM, healthyCase–control study150 (52.0)53.4 ± 6.430.8 ± 5.9PCR-RFLPHDL-C, LDL-C, TG, TC6
230R>C
Villarreal-Molina, 2007Mexico-Cohort study429 (64)40.1 ± 12.427.5 ± 5.5TaqMan assayHDL-C, TG, TC7
Romero-Hidalgo, 2011Mexico-Cross-sectional study3591 (67.7)46.7 ± 13.128.4 ± 4.9TaqMan assayHDL-C, LDL-C, TC7
Haghvirdizadeh, 2015MalaysiaT2DM, healthyCase–control study329(42.2)58.5 ± 10.727.5 ± 5.7PCR-HRMHDL-C, LDL-C, TG, TC5
Du, 2020ChinaT2DMCase–control study996 (50.2)60.2 ± 8.626.4 ± 3.2PCR, SNaPshotHDL-C, LDL-C7
SD: standard deviation, BMI: body mass index, NOS: Newcastle–Ottawa scale, IRS: insulin resistance syndrome, FH: familial hypercholesterolemia, T2DM: type 2 diabetes mellitus, ACI: atherothrombotic cerebral infarction, LI: lacunar infarction, NA: not available, RFLP: restriction fragment length polymorphism, ASO: allele-specific oligonucleotide hybridization, PCR: polymerase chain reaction, HRM: high-resolution melt, MALDI-TOF MS: matrix-assisted laser desorption time-of-flight mass spectrometry, HDL-C: high-density lipoprotein cholesterol, LDL-C: low-density lipoprotein cholesterol, TG: triglycerides, TC: total cholesterol.
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Shim, S.-Y.; Yoon, H.-Y.; Yee, J.; Han, J.-M.; Gwak, H.-S. Association between ABCA1 Gene Polymorphisms and Plasma Lipid Concentration: A Systematic Review and Meta-Analysis. J. Pers. Med. 2021, 11, 883. https://doi.org/10.3390/jpm11090883

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Shim S-Y, Yoon H-Y, Yee J, Han J-M, Gwak H-S. Association between ABCA1 Gene Polymorphisms and Plasma Lipid Concentration: A Systematic Review and Meta-Analysis. Journal of Personalized Medicine. 2021; 11(9):883. https://doi.org/10.3390/jpm11090883

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Shim, Sun-Young, Ha-Young Yoon, Jeong Yee, Ji-Min Han, and Hye-Sun Gwak. 2021. "Association between ABCA1 Gene Polymorphisms and Plasma Lipid Concentration: A Systematic Review and Meta-Analysis" Journal of Personalized Medicine 11, no. 9: 883. https://doi.org/10.3390/jpm11090883

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