Effect of FABP2 gene G54A polymorphism on lipid and glucose metabolism in simple obesity children

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1 JOURNAL OF HYGIENE RESEARCH Vol. 45 No. 1 Jan 檾檾檾檾 DANONE INSTITUTE CHINA Young Scientists' Forum 檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾檾 FABP2 G54A FABP2 G54A 54A FABP PCR - RFLP FABP2 G54A DNA FBG TG TC HDL-C LDL-C Ins ELISA FFA HOMA-IR FABP2 G54A / G /G G /A A /A 33. 7% 49. 4% 16. 9% G /G G /A A /A 51. 0% 40. 0% 9. 0% χ 2 = P < / 54G 54A 58. 4% 41. 6% 54G 54A 71. 0% 29. 0% χ 2 = P < / TG P < Ins P < HOMA-IR P < / G /G A /A TG P < Ins FFA HOMA-IR FABP2 G54A 54A R A Effect of FABP2 gene G54A polymorphism on lipid and glucose metabolism in simple obesity children XU Yunpeng Rao Xiaojiao HAO Min HOU Lijuan ZHU Xiaobo CHANG Xiaotong Department of Biochemistry Hebei North University Zhangjiakou China Abstract Objective To explore the relationship between intestinal fatty acid binding protein FABP2 gene G54A polymorphism and simple childhood obesity the effect of mutant 54A FABP2 gene on serum lipids and glucose metabolism. Methods The total of 83 subjects with overweight / obesity and 100 subjects with healthy / normal weight were involved in this study. The G54A FABP2 gene allele and genotype frequencies between control group and overweight / obesity group were detected using No. C No. CXRC1316 unicorn_xyp@ hotmail. com 1 changxt1212@ vip. sina. com

2 2 45 polymerase chain reaction PCR -restriction fragment length polymorphism RFLP technology and DNA sequences were confirmed by DNA sequencing. The automatic biochemical analyzer was used to detect fasting blood glucose FBG triglyceride TG total cholesterol TC high-density lipoprotein cholesterol HDL-C and low-density lipoprotein cholesterol LDL-C levels. Plasma insulin Ins was detected by radiation immune method free fatty acids FFA was tested by ELISA method insulin resistance index HOMA-IR was also calculated. The correlation between FABP2 G54A polymorphism and the development of children' obesity was analyzed. The relation between FABP2 G54A polymorphism and abnormal blood lipid and insulin resistance was assessed. Results The results of study on FABP2 gene polymorphism revealed as followed. In overweight /obese groups the frequencies of GG GA AA genotypes was 33. 7% 49. 4% and 16. 9% respectively. In control group the frequencies of GG GA AA genotypes was 51. 0% 40. 0% and 9. 0% respectively. The differences between two groups was statistically significant χ 2 = P < In overweight /obesity group the frequencies of alleles were 58. 4% for 54G and 41. 6% for 54A. In control group the frequencies of alleles were 71. 0% for 54G and 29. 0% for 54A. There was significant differences χ 2 = P < The plasma biochemical variables results showed that compared with the normal control group plasma TG P < Ins P < HOMA-IR P < were elevated in overweight /obesity group the difference between two groups was statistically significant. At the same time in overweight /obesity group the carriers of AA homozygous genotypes had significantly higher plasma TG levels than those with GG wild genotypes P < A increased tendency of plasma Ins FFA levels and HOMA-IR was found in the carriers with AA homozygous genotypes but no differences compared with those with GG wild genotypes. Compared with those with GG wild genotypes related plasma biochemical variables in the carriers with GA heterozygous genotypes had no differences P > Conclusion The FABP2 gene G54A polymorphism is related to simple children obesity and lipid metabolism abnormality. The allele encoding in FABP2 gene may be a potential factor contributing to promoting lipid metabolism abnormality of and insulin resistance. Key words simple childhood obesity intestinal fatty acid-binding protein 2 gene polymorphism Ala Thr GCT /GCT G54G GCT /ACT G54A ACT /ACT A54A G54A A 3-5 FABP2 54 FABP2 intestinal 54A fatty acid-binding protein FABP2 G54A LCFA 3 FABP rs G A

3 1. FABP2 G54A 3 A 280 A 260 /A 280 DNA ng ~ ± BMI ± ~ ± BMI ± / BMI P < 20 μmol /L 1 μl 20 μmol /L ml 1 μl DNA 0. 1 ~ 1 μg 50 μl 94 3 min s s 72 1 min min PCR Genebank FABP2 NC _ GAPDH NC_ Primer Ins mu /L / Oligo NCBI FABP2 5'-ACAGGTGTTAAT ATAGTGAAAAGG-3' 5'-ATTGGC 1. 2 DNA PCR- PCR-RFLP FABP μl Taq polymerase 5 U /μl μl 10 PCR Buffer 5 μl dntp Mixture each 2. 5 mmol /L 4 μl FFA HOMA HOMA-IR = FBG SPSS x 珋 ± s t DNA GAPDH 1% PCR cat. #DP FABP2 Taq DNA Polymerase cat. #DR100A HhaⅠ 37 2 h Hha I cat. #ER1851 PCR 10 μlrna Thermo fisher Scientific 18 μl 10 Buffer Tango 2 μl HhaⅠ 1 μl 3% PCR DNA DNA Thermo PX2 thermal cycler PCR Multiskan MK3 Thermo Scientific 1. 4 SMA S /00771 Bio- FBG TC TG Rad 320 HDL-C XH-6080 γ LDL-C Ins ELISA TTCTTCAGTTAGTGAAGG-3' FABP2 304bp G54A GAPDH = / 5'-ACCACAGT χ 2 Hardyweinberg P < CCATGCCATCAC-3' 5'-TCACCACC CTGTTGCTGTA-3' 451bp Invitrogen μl 2. 1 / K DNA 1 / 1% DNA TG P < A 260 Ins P < 0. 05

4 4 45 Table 1 n 1 / The assayed results of biochemical variables between overweignt / obesity and control groups TG / TC / HDL-C / LDL-C / FBG / FFA / μmol /L Ins / mu /L HOMA-IR ± ± ± ± ± ± ± ±0. 73 / ± ± ± ± ± ± ± ± P < P < TC HDL-C LDL-C FBG FFA 2. 2 PCR DNA PCR 1% 300 bp FABP2 GAPDH 451 bp 1 M 2000 bp DNA Marker G GAPDH 451 bp G54 /A bp 204 bp Hha I GCG C 100 bp A54 /A54 1 FABP2 Hha I 304 bp 2 6 G54 /G G54 /G54 bp 100 bp 9 FABP2 PCR 204 bp 100 bp 1 FABP2 PCR Hha I G54 /A54 1 Figure 1 Restriction endonuclease Hha I digestion 304 bp 204 bp 100 bp analysis of PCR products of FABP2 gene A54 /A54 2 GeneBank 100% 304 bp G 54 A 54 FABP2 2 G G 3 FABP2 A 2 GCT /GCT /ACT " " 54 Figure FABP2 G54 /A54 / P = FABP2 PCR Sequence maps of PCR products of FABP2 gene P = FABP2 G54A OR % CI 1. 04~ ACT OR % CI 0. 53~ / GG 2 / AA TG χ 2 = P < P < Ins FFA HOMA-IR G /A χ 2 = P < GCT GG

5 1. FABP2 G54A 5 Table 2 2 / FABP2 The distributions of genotype and allele of FABP2 between overweignt / obesity and control groups N G /G G /A A /A GCT ACT n % / χ P TG / Table 3 3 / G54A Effects of FABP2 gene G54A polymorphism on plasm biochemical variables TC / HDL-C / LDL-C / FBG / FFA / μmol /L Ins / mu /L HOMA-IR AA / ± ± ± ± ± ± ± ± AT / ± ± ± ± ± ± ± ± TT / ± ± ± ± ± ± ± ± GG P < LCFA 54A G54A FAT /CD36 FABP2 G54A FABP2 4 q28 ~ FABP2 / FABP2 FABP2 FABP2 132 / β βa ~ βj β-barrel / TG Ins N α αi αii HOMA-IR FABP2 LCFA FFA FABP2 FBG Ins 5% HOMA-IR / / FABP2 G /G G /A A /A 54A FABP2 G /A A /A CHAMBERLAIN 4 ACT 2148 FABP2 Hardy-Weinberg G54A FABP2 P > / FABP2 G54A 7-11 DANIEL TAVRIDOU G54G

6 6 45 A54A FABP2 19 A54A DE KONING FABP2 TG FABP2 3 A54A TG 972 TG FFA VLDL LDL-C 54A FABP2 LCFA LCFA 54A LDL-C TG FABP2 20 TG HDL TG FABP2 TG HDL-C meta 54A MONTOUDIS 17 TC LDL-C HDL-C FABP2 22 A54A β FABP2 / TC HDL-C FBG FABP2 ALT TG / glucose-dependent insulinotropic polypeptide GIP / FABP2 18 FABP2 G54A FABP2-54A / FABP2 G54A 54A FABP2 FABP2 β GIP 54A 1 BAMMANN K PEPLIES J DE HENAUW S et al. FABP2 Early life course risk factors for childhood obesity 16 the idefics case-control study J. PPLoS One FABP2 G54A e CHRISTODOULOS A D DOUDA H T TOKMAKIDIS S P. Cardiorespiratory fitness metabolic risk and / G /G inflammation in children J. Int J Pediatr 2012 FABP2 A /A TG P < Ins FFA 3. HOMA-IR J. G /A G /G 4 CHAMBERLAIN A M SCHREINER P J FORNAGE M et al. Ala54Thr polymorphism of the fatty acid ob ob /ob binding protein 2 gene and saturated fat intake in

7 1. FABP2 G54A 7 relation to lipid levels and insulin resistance the Coronary Artery Risk Development in Young Adults CARDIA study J. Metabolism DE LUIS D A GONZALEZ SAQRADO M ALLER R et al. Influence of Ala54Thr polymorphism of fatty acid-binding protein 2 on insulin resistance and adipocytokines in patients with diabetes mellitus type 2 J. Eur Rev Med Pharmacol Sci J. 16 VASSILEA G HUWYLER L POIRIER K et al The intestinal fatty acid binding protein is not 7 TAVRIDOU A ARVANITIDIS K I TIPTIRI- essential for dietary fat absorption in mice J. KOURPETI A et al. Thr54 allele of fatty-acid FASEB J binding protein 2 gene is associated with obesity but 17 MONTOUDIS A SEIDMAN E BOUDREAU F et not type 2 diabetes mellitus in a Caucasian population al. Intestinal fatty acid binding protein regulates J. Diabetes Res Clin Pract mitochondrion beta-oxidation and cholesterol uptake DE KONING L MERCHANT A T HEGELE R A et al. Association of the FABP2 T54 variant with plasma triglycerides and insulin resistance in a multiethnic population J. Clin Chem P et al. Congenital leptin deficiency is associated FABP2 54 with severe early-onset obesity in humans J. J. Nature FABP2 association of fatty acid-binding protein 2 A54T J. polymorphism with postprandial lipemia depends on J. 21 BERTHIER M T COUILLARD C PRUD'HOMME D et al. Effects of the FABP2 A54T mutation on 12 de LUIS D A SAGRADO M G ALLER R et al. Metabolic syndrome and ALA54THR polymorphism of fatty acid-binding protein 2 in obese patients J. Metabolism PHILLIPS K L SCHIEVE L A VISSER S et al. Prevalence and impact of unhealthy weight in a national sample of us adolescents with autismand other learning and behavioral disabilities J. Matern Child Health J TAVRIDOU A ARVANITIDIS K I TIPTIRI-KOURPETI A et al. Thr54 allele of fatty-acid binding protein 2 gene is associated with obesity but not type 2 diabetes mellitus in a Caucasian population J. Diabetes Res Clin Pract DE KONING L MERCHANT A T HEGELE R A et al. Association of the FABP2 T54 variant with plasma triglycerides and insulin resistance in a multiethnic population J. Clin Chem J. J Lipid Res AUINGER A HELWIG U RUBIN D et al. Human intestinal fatty acid binding protein 2 expression is associated with fat intake and polymorphisms J. J Nutr MONTAGUE C T FAROOQI I S WHITEHEAD J 20 HELWIG U RUBIN D KLAPPER M et al. The promoter variability J. Metabolism triglyceride metabolism of viscerally obese men J. Obes Res ZHAO T NZEKEBALOUDOU M LV J. Ala54Thr polymorphism of fatty acid-binding protein 2 gene and fasting blood lipids a meta-analysis J. Atherosclerosis