Genetic Variants and Early Cigarette Smoking and Nicotine Dependence Phenotypes in Adolescents
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BACKGROUND: While the heritability of cigarette smoking and nicotine dependence (ND) is well-documented, the contribution of specific genetic variants to specific phenotypes has not been closely examined. The objectives of this study were to test the associations between 321 tagging single-nucleotide polymorphisms (SNPs) that capture common genetic variation in 24 genes, and early smoking and ND phenotypes in novice adolescent smokers, and to assess if genetic predictors differ across these phenotypes. METHODS: In a prospective study of 1294 adolescents aged 12-13 years recruited from ten Montreal-area secondary schools, 544 participants who had smoked at least once during the 7-8 year follow-up provided DNA. 321 single-nucleotide polymorphisms (SNPs) in 24 candidate genes were tested for an association with number of cigarettes smoked in the past 3 months, and with five ND phenotypes (a modified version of the Fagerstrom Tolerance Questionnaire, the ICD-10 and three clusters of ND symptoms representing withdrawal symptoms, use of nicotine for self-medication, and a general ND/craving symptom indicator). RESULTS: The pattern of SNP-gene associations differed across phenotypes. Sixteen SNPs in seven genes (ANKK1, CHRNA7, DDC, DRD2, COMT, OPRM1, SLC6A3 (also known as DAT1)) were associated with at least one phenotype with a p-value <0.01 using linear mixed models. After permutation and FDR adjustment, none of the associations remained statistically significant, although the p-values for the association between rs557748 in OPRM1 and the ND/craving and self-medication phenotypes were both 0.076. CONCLUSIONS: Because the genetic predictors differ, specific cigarette smoking and ND phenotypes should be distinguished in genetic studies in adolescents. Fifteen of the 16 top-ranked SNPs identified in this study were from loci involved in dopaminergic pathways (ANKK1/DRD2, DDC, COMT, OPRM1, and SLC6A3). IMPACT: Dopaminergic pathways may be salient during early smoking and the development of ND.
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None of those 16 top-ranked SNPs were significant when controlled for multiple comparisons.
“In a recent study, 15 out of the 16 top-ranked single nucleotide polymorphisms associated with teen smoking or nicotine dependence were also found to be involved in dopaminergic signaling pathways, although none were significant when controlled for multiple comparisons (O'Loughlin et al. 2014).”
From <scp>N</scp> icotine and the adolescent brain (2015) · cites this paper as O'Loughlin et al. 2014
15 out of the 16 top-ranked single nucleotide polymorphisms associated with teen smoking or nicotine dependence were also found to be involved in dopaminergic signaling pathways.
“In a recent study, 15 out of the 16 top-ranked single nucleotide polymorphisms associated with teen smoking or nicotine dependence were also found to be involved in dopaminergic signaling pathways, although none were significant when controlled for multiple comparisons (O'Loughlin et al. 2014).”
From <scp>N</scp> icotine and the adolescent brain (2015) · cites this paper as O'Loughlin et al. 2014
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Saccone, S. F., Hinrichs, A. L., Saccone, N. L., Chase, G. A., Konvicka, K., Madden, P. A. F., Breslau, N., Johnson, E. O., Hatsukami, D., Pomerleau, O., et al. (2007) · Human Molecular Genetics · doi:10.1093/hmg/ddl438 · Cited by 850 · see citing works
Sequence variants at CHRNB3–CHRNA6 and CYP2A6 affect smoking behavior
The ENGAGE Consortium, Thorgeirsson, T. E., Gudbjartsson, D. F., Surakka, I., Vink, J. M., Amin, N., Geller, F., Sulem, P., Rafnar, T., Esko, T., et al. (2010) · Nature Genetics · doi:10.1038/ng.573 · Cited by 689 · see citing works
DiFranza, J. R., Savageau, J. A., Fletcher, K., O’Loughlin, J., Pbert, L., Ockene, J. K., McNeill, A. D., Hazelton, J., Friedman, K., Dussault, G., et al. (2007) · Archives of Pediatrics & Adolescent Medicine · doi:10.1001/archpedi.161.7.704 · Cited by 333 · cited 1× · see citing works
“Accumulating evidence suggests that ND symptoms can occur within months of first puff in some young smokers, [19, 20] challenging older assumptions that the development of ND takes at least two years after smoking onset [21].”
BackgroundSelf-citationTENHUNEN, J., SALMINEN, M., LUNDSTRÖM, K., KIVILUOTO, T., SAVOLAINEN, R., & ULMANEN, I. (1994) · European Journal of Biochemistry · doi:10.1111/j.1432-1033.1994.tb19083.x · Cited by 331 · see citing works
Sherva, R., Wilhelmsen, K., Pomerleau, C. S., Chasse, S. A., Rice, J. P., Snedecor, S. M., Bierut, L. J., Neuman, R. J., & Pomerleau, O. F. (2008) · Addiction · doi:10.1111/j.1360-0443.2008.02279.x · Cited by 143 · see citing works
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Research works printed but not linked: 71
- [1]Carpenter CM, Wayne GF, Connolly GN (2007) The role of sensory perception in the development and targeting of tobacco products. Addiction 102: 136– 147. 17207131
- [2]Benowitz NL (1988) Drug therapy. Pharmacologic aspects of cigarette smoking and nicotine addiction. N Engl J Med 319: 1318– 1330. 3054551
- [3]Laucht M, Becker K, Frank J, Schmidt MH, Esser G, et al (2008) Genetic Variation in Dopamine Pathways Differentially Associated With Smoking Progression in Adolescence. J Am Acad Child Adolesc Psychiatry 47: 673– 681. 18434921
- [4]Shippenberg TS, Herz A, Spanagel R, Bals-Kubik R, Stein C (1992) Conditioning of opioid reinforcement: neuroanatomical and neurochemical substrates. Ann N Y AcadSci 654: 347– 356. 1321576
- [5]Nestler EJ (2002) From neurobiology to treatment: progress against addiction. Nat Neurosci 5 Suppl: 1076– 1079. 12403990
- [6]Leonard S, Bertrand D (2001) Neuronal nicotinic receptors: from structure to function. Nicotine Tob Res 3: 203– 223. 11506765
- [7]Li MD, Cheng R, Ma JZ, Swan GE (2003) A meta-analysis of estimated and environmental effects on smoking behavior in male and female adult twins. Addiction 98: 23– 31. 12492752
- [8]Sullivan PF, Kendler KS (1999) The genetic epidemiology of smoking. Nicotine Tob Res 1 Suppl 2 S51–57, S69–70. 11768187
- [10]Caporaso N, Gu F, Chatterjee N, Sheng-Chih J, Yu K, et al (2009) Genome-wide and candidate gene association study of cigarette smoking behaviors. PloS One 4: e4653. 19247474 PMC2644817
- [11]Munafò M, Johnstone EC (2008) Genes and cigarette smoking. Addiction 103: 893– 904. 18190672
- [12]Tobacco and Genetics Consortium (2010) Genome-wide meta-analyses identify multiple loci associated with smoking behavior. Nat Genet 42: 441– 447. 20418890 PMC2914600
- [13]Han S, Gelernter J, Luo X, Yang BZ (2010) Meta-analysis of 15 genome-wide linkage scans of smoking behavior. Biol Psychiatry 67: 12– 19. 19819424 PMC2975396
- [15]Liu JZ, Tozzi F, Waterworth DM, Pillai SG, Muglia P, et al (2010) Meta-analysis and imputation refines the association of 15q25 with smoking quantity. Nat Genet 42: 436– 440. 20418889 PMC3612983
- [16]Munafò MR, Flint J (2004) Meta-analysis of genetic association studies. Trends Genet 20: 439– 444. 15313553
- [17]Audrain-McGovern J, Lerman C, Wileyto EP, Rodriguez D, Shields PG (2004) Interacting effects of genetic predisposition and depression on adolescent smoking progression. Am J Psychiatry 161: 1224– 1230. 15229055
- [18]Huang S, Cook DG, Hinks LJ, Chen XH, Ye S, et al (2005) CYP2A6, MAOA, DBH, DRD4, and 5HT2A genotypes, smoking behaviour and cotinine levels in 1518 UK adolescents. Pharmacogenet Genomics 15: 839– 850. 16272956
- [20]O'Loughlin J, Gervais A, Dugas E, Meshefedjian G (2009) Milestones in the Process of Cessation Among Novice Adolescent Smokers. Am J Public Health 99: 499– 504. 18633080 PMC2661454
- [22]O'Loughlin J, Dugas E, Brunet J, DiFranza J, Engert J, et al. (2014) Cohort Profile: The Nicotine Dependence in Teens (NDIT) Study. Int J Epidemiol (in press). PMC4681104 25022274
- [23]Centers for Disease Control and Prevention (1998) Selected cigarette smoking initiation and quitting behaviors among high school students - United States, 1997. Morb Mortal Wkly Rep 47: 386– 389. 9614006
- [24]Eppel A, O'Loughlin J, Paradis G, Platt R (2006) Reliability of self-reports of cigarette use in novice smokers. Addict Behav 31: 1700– 1704. 16359824
- [25]Heatherton TF, Kozlowski LT, Frecker RC, Fagerström KO (1991) The Fagerström Test for Nicotine Dependence: a revision of the Fagerström Tolerance Questionnaire. Br J Addict 86: 1119– 1127. 1932883
- [27]O'Loughlin J, DiFranza J, Tarasuk J, Meshefedjian G, McMillan-Davey E, et al (2002) Assessment of nicotine dependence symptoms in adolescents: a comparison of five indicators. Tob Control 11: 354– 360. 12432161 PMC1747676
- [28]Wheeler KC, Fletcher KE, Wellman RJ, DiFranza JR (2004) Screening adolescents for nicotine dependence: the Hooked On Nicotine Checklist. J AdolescHealth 35: 225– 230. 15313504
- [29]Rojas NL, Killen JD, Haydel KF, Robinson TN (1998) Nicotine dependence among adolescent smokers. Arch PediatrAdolesc Med 152: 15– 16. 9491041
- [30]O'Loughlin J, Kishchuk N, DiFranza J, Tremblay M, Paradis G (2002) The hardest thing is the habit: a qualitative investigation of adolescent smokers' experience of nicotine dependence. NicTob Res 4: 20– 29. 12028853
- [31]de Bakker PI, Yelensky R, Pe'er I, Gabriel SB, Daly MJ, et al (2005) Efficiency and power in genetic association studies. Nat Genet 37: 1217– 1223. 16244653
- [32]Barrett JC, Fry B, Maller J, Daly MJ (2005) Haploview: analysis and visualization of LD and haplotype maps. Bioinformatics 21: 263– 265. 15297300
- [33]The International HapMap Consortium (2007) A second generation human haplotype map of over 3.1 million SNPs. Nature 449: 851– 861. 17943122 PMC2689609
- [34]Westfall PH, Young SS (1993) Resampling-based multiple testing: Examples and methods for p-value adjustment. John Wiley & Sons.
- [35]Goeman JJ, Solari A (2014) Multiple hypothesis testing in genomics. Stat Med 33: 1946– 1978. 24399688
- [39]Lerman CE, Schnoll RA, Munafo MR (2007) Genetics and smoking cessation improving outcomes in smokers at risk. Am J Prev Med 336: S398– 405. PMC2170888 18021915
- [40]Breitling LP, Dahmen N, Illig T, Rujescu D, Nitz B, et al (2009) Variants in COMT and spontaneous smoking cessation: retrospective cohort analysis of 925 cessation events. Pharmacogenet Genomics 19: 657– 659. 19584770
- [42]Shield AJ, Thomae BA, Eckloff BW, Wieben ED, Weinshilboum RM (2004) Human catechol O-methyltransferase genetic variation: gene resequencing and functional characterization of variant allozymes. Mol Psychiatry 9: 151– 160. 14966473
- [43]Omidvar M, Stolk L, Uitterlinden AG, Hofman A, Van Duijn CM, et al (2009) The effect of catechol-O-methyltransferase Met/Val functional polymorphism on smoking cessation: retrospective and prospective analyses in a cohort study. Pharmacogenet Genomics 19: 45– 51. 19160592
- [44]Tammimäki AE, Männistö PT (2010) Are genetic variants of COMT associated with addiction? PharmacogenetGenomics 20: 717– 741. 20975619
- [45]Ma JZ, Beuten J, Payne TJ, Dupont RT, Elston RC, et al (2005) Haplotype analysis indicates an association between the DOPA decarboxylase (DDC) gene and nicotine dependence. Hum Mol Genet 14: 1691– 1698. 15879433
- [46]Yu Y, Panhuysen C, Kranzler HR, Hesselbrock V, Rounsaville B, et al (2006) Intronic variants in the dopa decarboxylase (DDC) gene are associated with smoking behavior in European-Americans and African-Americans. Hum Mol Genet 15: 2192– 2199. 16740595
- [47]Singleton AB, Thomson JH, Morris CM, Court JA, Lloyd S, et al (1998) Lack of association between the dopamine D2 receptor gene allele DRD2*A1 and cigarette smoking in a United Kingdom population. Pharmacogenetics 8: 125– 128. 10022750
- [48]Batra A, Gelfort G, Bartels M, Smoltczyk H, Buchkremer G, et al (2000) The dopamine D2 receptor (DRD2) gene-a genetic risk factor in heavy smoking? Addict Biol 5: 429– 436. 20575861
- [49]Hiemstra M, Kleinjan M, van Schayck OC, Engels RC, Otten R (2014) Environmental smoking and smoking onset in adolescence: the role of dopamine-related genes. Findings from two longitudinal studies. PLoS One 9: e86497. 24466121 PMC3897729
- [50]Hiemstra M, Engels RC, Barker ED, van Schayck OC, Otten R (2013) Smoking-specific parenting and smoking onset in adolescence: the role of genes from the dopaminergic system (DRD2, DRD4, DAT1 genotypes). PLoS One 8: e61673. PMC3630129 23637880
- [51]Li MD, Ma JZ, Beuten J (2004) Progress in searching for susceptibility loci and genes for smoking-related behaviour. Clin Genet 66: 382– 392. 15479180
- [52]Munafò M, Clark T, Johnstone EC, Murphy M, Walton R (2004) The genetic basis for smoking behavior: a systematic review and meta-analysis. Nicotine Tob Res 6: 583– 597. 15370155
- [53]Comings DE, Ferry L, Bradshaw-Robinson S, Burchette R, Chiu C, et al (1996) The dopamine D2 receptor (DRD2) gene: a genetic risk factor in smoking. Pharmacogenetics 6: 73– 79. 8845863
- [54]Erblich J, Lerman C, Self DW, Diaz GA, Bovbjerg DH (2004) Stress-induced cigarette craving: effects of the DRD2 TaqI RFLP and SLC6A3 VNTR polymorphisms. Pharmacogenomics J 4: 102– 109. 14732864
- [55]Li D, London SJ, Liu J, Lee W, Jiang X, et al 2011) Association of the calcyon neuron-specific vesicular protein gene (CALY) with adolescent smoking initiation in China and California. Am J Epidemiol 173: 1039– 1048. 21415033 PMC3121219
- [56]Lobo DS, Zawertailo L, Selby P, Kennedy JL (2012) The role of ANKK1 and TTC12 genes on drinking behaviour in tobacco dependent subjects. World J Biol Psychiatry 13: 232– 238. 21936764
- [57]Huang W, Payne TJ, Ma JZ, Beuten J, Dupont RT, et al (2009) Significant association of ANKK1 and detection of a functional polymorphism with nicotine dependence in an African-American sample. Neuropsychopharmacology 34: 319– 330. 18354387
- [58]Radwan GN, El-Setouhy M, Mohamed MK, Hamid MA, Azem SA, et al (2007) DRD2/ANKK1 TaqI polymorphism and smoking behavior of Egyptian male cigarette smokers. Nicotine Tob Res 9: 1325– 1329. 18058350
- [59]Ducci F, Kaakinen M, Pouta A, Hartikainen AL, Veijola J, et al (2011) TTC12-ANKK1-DRD2 and CHRNA5-CHRNA3-CHRNB4 influence different pathways leading to smoking behavior from adolescence to mid-adulthood. Biol Psychiatry 69: 650– 660. 21168125 PMC3058144
- [60]Doran N, Schweizer CA, Myers MG, Greenwood TA (2013) A prospective study of the effects of the DRD2/ANKK1 TaqIA polymorphism and impulsivity on smoking initiation. Subst Use Misuse 48: 106– 116. 23153044
- [61]Wernicke C, Reese J, Kraschewski A, Winterer G, Rommelspacher H, et al (2009) Distinct haplogenotypes of the dopamine D2 receptor gene are associated with non-smoking behaviour and daily cigarette consumption. Pharmacopsychiatry 42: 41– 50. 19308877
- [62]Voisey J, Swagell CD, Hughes IP, van Daal A, Noble EP, et al (2012) A DRD2 and ANKK1 haplotype is associated with nicotine dependence. Psychiatry Res 196: 285– 289. 22382052
- [63]Gelernter J, Yu Y, Weiss R, Brady K, Panhuysen C, et al (2006) Haplotype spanning TTC12 and ANKK1, flanked by the DRD2 and NCAM1 loci, is strongly associated to nicotine dependence in two distinct American populations. Hum Mol Genet 15: 3498– 3507. 17085484
- [64]Vandenbergh DJ, Bennett CJ, Grant MD, Strasser AA, O'Connor R, et al (2002) Smoking status and the human dopamine transporter variable number of tandem repeats (VNTR) polymorphism: failure to replicate and finding that never-smokers may be different. Nicotine Tob Res 4: 333– 340. 12215242
- [65]Jorm AF, Henderson AS, Jacomb PA, Christensen H, Korten AE, et al (2000) Association of smoking and personality with a polymorphism of the dopamine transporter gene: results from a community survey. Am J Med Genet 96: 331– 334. 10898910
- [66]Ling D, Niu T, Feng Y, Xing H, Xu X (2004) Association between polymorphism of the dopamine transporter gene and early smoking onset: an interaction risk on nicotine dependence. J Hum Genet 49: 35– 39. 14685824
- [67]Timberlake DS, Haberstick BC, Lessem JM, Smolen A, Ehringer M, et al (2006) An association between the DAT1 polymorphism and smoking behavior in young adults from the National Longitudinal Study of Adolescent Health. Health Psychol 25: 190– 197. 16569110
- [68]Bergen AW, Conti DV, Van Den Berg D, Lee W, Liu J, et al (2009) Dopamine genes and nicotine dependence in treatment-seeking and community smokers. Neuropsychopharmacology 34: 2252– 2264. 19494806 PMC3558036
- [69]Stapleton JA, Sutherland G, O'Gara C (2007) Association between dopamine transporter genotypes and smoking cessation: a meta-analysis. Addict Biol 12: 221– 226. 17508996
- [70]Hiemstra M, Engels RC, Barker ED, van Schayck OC, Otten R (2013) Smoking-specific parenting and smoking onset in adolescence: the role of genes from the dopaminergic system (DRD2, DRD4, DAT1 genotypes). PLoS One 8: e61673. 23637880 PMC3630129
- [71]Zhang L, Kendler KS, Chen X (2006) The mu-opioid receptor gene and smoking initiation and nicotine dependence. Behav Brain Funct 2: 28. 16887046 PMC1557520
- [72]Ray R, Ruparel K, Newberg A, Wileyto EP, Loughead JW, et al (2011) Human Mu Opioid Receptor (OPRM1 A118G) polymorphism is associated with brain mu-opioid receptor binding potential in smokers. ProcNatlAcadSci USA 108: 9268– 9273. PMC3107291 21576462
- [73]Perkins KA, Lerman C, Grottenthaler A, Ciccocioppo MM, Milanak M, et al (2008) Dopamine and opioid gene variants are associated with increased smoking reward and reinforcement owing to negative mood. BehavPharmacol 19: 641– 649. PMC2717609 18690118
- [74]Chen YT, Tsou HH, Kuo HW, Fang CP, Wang SC, et al (2012) OPRM1 genetic polymorphisms are associated with the plasma nicotine metabolite cotinine concentration in methadone maintenance patients: a cross sectional study. J Hum Genet 58: 84– 90. 23223006
- [75]Pedneault M, Labbe A, Roy-Gagnon MH, Low NC, Dugas E, et al (2014) The association between CHRN genetic variants and dizziness at first inhalation of cigarette smoke. Addict Behav 39: 316– 320. 24119711
- [77]Keskitalo-Vuokko K, Pitkäniemi J, Broms U, Heliövaara M, Aromaa A, et al (2011) Associations of nicotine intake measures with CHRN genes in Finnish smokers. Nicotine Tob Res 13: 686– 690. PMC3150688 21498873
- [78]Baker TB, Weiss RB, Bolt D, von Niederhausern A, Fiore MC, et al (2009) Human neuronal acetylcholine receptor A5-A3-B4 haplotypes are associated with multiple nicotine dependence phenotypes. Nicotine Tob Res 11: 785– 796. 19436041 PMC2699926
- [80]Stephens SH, Hartz SM, Hoft NR, Saccone NL, Corley RC, et al (2013) Distinct loci in the CHRNA5/CHRNA3/CHRNB4 gene cluster are associated with onset of regular smoking. Genet Epidemiol 37: 846– 859. 24186853 PMC3947535
- [81]Saccone NL, Schwantes-An TH, Wang JC, Grucza RA, Breslau N, et al (2010) Multiple cholinergic nicotinic receptor genes affect nicotine dependence risk in African and European Americans. Genes Brain Behav 9: 741– 750. 20584212 PMC2970751
- [82]Wong SL, Shields M, Leatherdale S, Malaison E, Hammond D (2012) Assessment of validity of self-reported smoking status. HealthRep 23: 47– 53. 22590805
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<scp>N</scp> icotine and the adolescent brain
Yuan, M., Cross, S. J., Loughlin, S. E., & Leslie, F. M. (2015) · The Journal of Physiology · doi:10.1113/jp270492 · Cited by 582 · see citing works
- Authors
- O'Loughlin, J., Sylvestre, M.-P., Labbe, A., Low, N. C., Roy-Gagnon, M.-H., Dugas, E. N., Karp, I., & Engert, J. C.
- Affiliations
- Centre Hospitalier de l’Université de Montréal (CA)
- McGill University (CA)
- Western University (CA)
- McGill University Health Centre (CA)
- Venue
- PLoS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2014-12-29
- Volume
- 9
- Issue
- 12
- Pages
- e115716
- ISSN
- 1932-6203 (ISSN-L)
- PMC
- PMC4278712
- OpenAlex
- W2006758057
- Cited by
- 21
- References
- 5
- Citations by year
- 2025: 2 · 2024: 1 · 2023: 3 · 2022: 3 · 2021: 2 · 2020: 3 · 2019: 2 · 2018: 1 · 2017: 1 · 2016: 1 · 2015: 2
- FWCI
- 0.89
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- PLoS ONE (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Papyrus : Institutional Repository (Université de Montréal) (submittedVersion, cc-by)
- Funders
- McGill University
- Genome Canada
- Canadian Institutes of Health Research
- Topics
- Health Sciences › Medicine › Physiology › Smoking Behavior and Cessation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
- Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
- Keywords
- adolescent smoking, nicotine dependence, genetic susceptibility, single nucleotide polymorphisms, candidate genes, dopaminergic pathways, ANKK1, DRD2, catechol-O-methyltransferase, OPRM1, dopamine transporter, nicotine withdrawal, craving, Fagerström Tolerance Questionnaire, smoking initiation
- MeSH terms
- Adolescent, Child, Dopamine, Female, Humans, Male, Phenotype, Smoking, Tobacco Use Disorder, Cohort Studies, Genetic Predisposition to Disease, Polymorphism, Single Nucleotide, White People, Metabolic Networks and Pathways
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