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The Genom of Homo sapiens.pdf

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412 CHIBA-FALEK AND NUSSBAUMTable 4. Association Studies <strong>of</strong> NACP-Rep1 with Sporadic PDStudy χ 2 Population Allele a –1 a 0 a 1 a 2 a 3 aFarrer et al. (2001) p = 0.005 Caucasian PD 1(0.2) 126(20.6) 430(70.3) 54(8.8) 1(0.2)(European) control 3(0.8) 110(29.1) 236(62.4) 28(7.4) 1(0.3)Kruger et al. (1999) p = 0.16 Caucasian PD 33(20.2) 113(69.1) 17(10.7) 0German control 44(22.8) 139(72.0) 10(5.2) 0Tan et al. (2000) p = 0.009 Caucasian PD 42(21) 140(70) 18(9) 0control 56(28) 139(69.5) 5(2.5) 0Parsian et al. (1998) p = 0.19 Caucasian PD 118(27.3) 275(63.7) 39(9) 0control 114(32.8) 203(58.3) 31(8.9) 0Khan et al. (2001) p = 0.64 UK PD 77(25.1) 212(69.4) 17(5.5) 0control 86(26.1) 216(65.5) 28(8.4) 0TOTAL p = 0.0007 Caucasian PD 396(23.1) 1170(68.3 145(8.5) 1control 410(28.3) 933(64.5) 102(7) 1Izumi et al. (2001) p = 0.14 Japanese PD 1(0.25) 163(40.75) 99(24.75) 132(33) 5(1.25)control 1(0.2) 195(39) 160(32) 136(27.2) 6(1.2)Mizuta et al. (2002) p = 0.017 Japanese PD 171(51.8) 84(25.5) 66(20) 6(1.8)control 126(40.6) 110(35.5) 65(21) 5(1.6)Tan et al. (2003) p = 0.20 Singaporean PD 148(36) 115(28) 140(34)control 169(41) 119(29) 115(28)TOTAL p = 0.0158 Asian PD 482(42.7) 298(26.4) 338(30) 11(0.9)control 490(40.6) 389(32.2) 316(26.2) 11(0.9)a Alleles as defined by size using Xia et al. (1996) original designation. <strong>The</strong> results are presented in each row as follows: number<strong>of</strong> chromosomes (% <strong>of</strong> chromosomes).NACP-Rep1 AS A TRANSCRIPTIONALFUNCTIONAL ELEMENTTo determine whether the genetic association studiescorrelated with biological function, we examined the activity<strong>of</strong> the entire 10.7-kb upstream region <strong>of</strong> SNCA in aluciferase reporter assay in 293T and SH-SY5Y cells todetermine the role <strong>of</strong> the NACP-Rep1 repeat and its variousalleles on SNCA promoter function (Chiba-Falek andNussbaum 2001). Luciferase expression levels variedvery significantly among the different alleles over a 3-fold range in the human neuroblastoma SH-SY5Y cellsbut showed little or no significant variation in the 293Tcells (Fig. 1). In SH-SY5Y cells, the highest promoter activitywas seen with the construct containing the repeatwith 11 CA (allele size 1), leading to a 3-fold increase inthe expression relative to the allele carrying 10 CA (allelesize 0) (Fig. 1) (Chiba-Falek and Nussbaum 2001). Itshould be noted that allele 1 and allele 0, respectively,confer the most significant increased and decreased relativerisk for PD in Caucasian populations. <strong>The</strong> constructcontaining the largest repeat (13 CA- size 3) resulted in a2.5-fold increase in activity over that seen with the constructcontaining 10 CA (size 0) repeats. <strong>The</strong> promoteractivity was suppressed as the length <strong>of</strong> the repeat decreasedto 12 CA (size 2), resulting in only a 1.5-fold increasein activity as compared to the shortest repeat.Figure 1. <strong>The</strong> ratio <strong>of</strong> fold expression <strong>of</strong> luciferase activity derived by the full-length pASP constructs harboring different NACP-Rep1 alleles to pASP-10.7 in SH-SY5Ycells. <strong>The</strong> fold expression for each pASP was determined by dividing the average relative activity<strong>of</strong> each construct to that <strong>of</strong> the average obtained with the empty pGL 3-Basic. <strong>The</strong>n, the ratio in percentage <strong>of</strong> the fold expressionfor each <strong>of</strong> the pASP-1, 2, and 3 relative to pASP-10.7 was determined. <strong>The</strong> average <strong>of</strong> the ratios <strong>of</strong> four to five independentexperiments performed on separate days was calculated. <strong>The</strong> fold expression <strong>of</strong> pASP-10.7 is arbitrarily assigned 100%. <strong>The</strong> datarepresented here are the average ratios in percentage ± 1 S.E.M. for the pASP-1, 2, and 3 constructs relative to pASP-10.7. Student’st-test comparing the “fold expression” <strong>of</strong> each <strong>of</strong> the pASP-1, 2, and 3 constructs to pASP-10.7 revealed p = 5 x 10 –6 , 0.002, and 5x 10 –9 , respectively, in SH-SY5Y cells. (Adapted, with permission, from Chiba-Falek and Nussbaum 2001.)

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