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2 results on '"Italian PBC Genetics Study Group"'

1. Pathway-based analysis of primary biliary cirrhosis genome-wide association studies

Author

Kar, S, Seldin, M, Chen, W, Lu, E, Hirschfield, G, Invernizzi, P, Heathcote, J, Cusi, D, the Italian PBC Genetics Study, G, Almasio, P, Alvaro, D, Andreone, P, Andriulli, A, Barlassina, C, Benedetti, A, Bernuzzi, F, Bianchi, I, Bragazzi, M, Brunetto, M, Bruno, S, Caliari, L, Casella, G, Coco, B, Colli, A, Colombo, M, Colombo, S, Cursaro, C, Croce, L, Crosignani, A, Donato, F, Elia, G, Fabris, L, Floreani, A, Galli, A, Grattagliano, I, Lazzari, R, Lleo, A, Macaluso, F, Marra, F, Marzioni, M, Mascia, E, Mattalia, A, Montanari, R, Morini, L, Morisco, F, Muratori, L, Muratori, P, Niro, G., P, A, Podda, M, Portincasa, P, Prati, D, Raggi, C, Rosina, F, Rossi, S, Sogno, I, Spinzi, G, Strazzabosco, M, Tarallo, S, Tarocchi, M, Tiribelli, C, Toniutto, P, Vinci, M, Zuin, M, Gershwin, M, Siminovitch, K, Amos, C, Kar, SP, Seldin, MF, Hirschfield, GM, INVERNIZZI, PIETRO, the Italian PBC Genetics Study Group, Almasio, PL, Bernuzzi, Francesca Veronica, Croce, LS, G. Picciotto, STRAZZABOSCO, MARIO, Gershwin, ME, Siminovitch, KA, Amos, CI, Kar, S, Seldin, M, Chen, W, Lu, E, Hirschfield, G, Invernizzi, P, Heathcote, J, Cusi, D, the Italian PBC Genetics Study, G, Almasio, P, Alvaro, D, Andreone, P, Andriulli, A, Barlassina, C, Benedetti, A, Bernuzzi, F, Bianchi, I, Bragazzi, M, Brunetto, M, Bruno, S, Caliari, L, Casella, G, Coco, B, Colli, A, Colombo, M, Colombo, S, Cursaro, C, Croce, L, Crosignani, A, Donato, F, Elia, G, Fabris, L, Floreani, A, Galli, A, Grattagliano, I, Lazzari, R, Lleo, A, Macaluso, F, Marra, F, Marzioni, M, Mascia, E, Mattalia, A, Montanari, R, Morini, L, Morisco, F, Muratori, L, Muratori, P, Niro, G., P, A, Podda, M, Portincasa, P, Prati, D, Raggi, C, Rosina, F, Rossi, S, Sogno, I, Spinzi, G, Strazzabosco, M, Tarallo, S, Tarocchi, M, Tiribelli, C, Toniutto, P, Vinci, M, Zuin, M, Gershwin, M, Siminovitch, K, Amos, C, Kar, SP, Seldin, MF, Hirschfield, GM, INVERNIZZI, PIETRO, the Italian PBC Genetics Study Group, Almasio, PL, Bernuzzi, Francesca Veronica, Croce, LS, G. Picciotto, STRAZZABOSCO, MARIO, Gershwin, ME, Siminovitch, KA, and Amos, CI

Abstract

Genome-wide association studies (GWAS) have successfully identified several loci associated with primary biliary cirrhosis (PBC) risk. Pathway analysis complements conventional GWAS analysis. We applied the recently developed linear combination test for pathways to datasets drawn from independent PBC GWAS in Italian and Canadian subjects. Of the Kyoto Encyclopedia of Genes and Genomes and BioCarta pathways tested, 25 pathways in the Italian dataset (449 cases, 940 controls) and 26 pathways in the Canadian dataset (530 cases, 398 controls) were associated with PBC susceptibility (P<0.05). After correcting for multiple comparisons, only the eight most significant pathways in the Italian dataset had FDR <0.25 with tumor necrosis factor/stress-related signaling emerging as the top pathway (P=7.38 × 10(-4), FDR=0.18). Two pathways, phosphatidylinositol signaling and hedgehog signaling, were replicated in both datasets (P<0.05), and subjected to two additional complementary pathway tests. Both pathway signals remained significant in the Italian dataset on modified gene set enrichment analysis (P<0.05). In both GWAS, variants nominally associated with PBC were significantly overrepresented in the phosphatidylinositol pathway (Fisher exact P<0.05). These results point to established and novel pathway-level associations with inherited predisposition to PBC that, on further independent replication and functional validation, may provide fresh insights into PBC etiology

Published
2013

2. Immunochip analyses identify a novel risk locus for primary biliary cirrhosis at 13q14, multiple independent associations at four established risk loci and epistasis between 1p31 and 7q32 risk variants.

Author

Juran, B, Hirschfield, G, Invernizzi, P, Atkinson, E, Li, Y, Xie, G, Kosoy, R, Ransom, M, Sun, Y, Bianchi, I, Schlicht, E, Lleo, A, Coltescu, C, Bernuzzi, F, Podda, M, Lammert, C, Shigeta, R, Chan, L, Balschun, T, Marconi, M, Cusi, D, Heathcote, E, Mason, A, Myers, R, Milkiewicz, P, Odin, J, Luketic, V, Bacon, B, Bodenheimer, H, Liakina, V, Vincent, C, Levy, C, Franke, A, Gregersen, P, Bossa, F, Gershwin, M, Deandrade, M, Amos, C, Italian PBC Genetics Study, G, Lazaridis, K, Seldin, M, Siminovitch, K, Almasio, P, Alvaro, D, Andreone, P, Andriulli, A, Barlassina, C, Battezzati, P, Benedetti, A, Bragazzi, M, Brunetto, M, Bruno, S, Caliari, L, Casella, G, Civardi, F, Coco, B, Colli, A, Colombo, M, Colombo, S, Cursaro, C, Crocè, L, Crosignani, A, Donato, F, Fabris, L, Ferrari, C, Floreani, A, Fontana, R, Galli, A, Grattagliano, I, Lazzari, R, Macaluso, F, Malinverno, F, Marra, F, Marzioni, M, Mascia, E, Mattalia, A, Montanari, R, Morini, L, Morisco, F, Muratori, L, Muratori, P, Niro, G, Picciotto, A, Portincasa, P, Prati, D, Rosina, F, Rossi, S, Selmi, C, Spinzi, G, Strazzabosco, M, Tarallo, S, Tiribelli, C, Toniutto, P, Vinci, M, Zuin, M, Juran, BD, Hirschfield, GM, INVERNIZZI, PIETRO, Atkinson, EJ, Schlicht, EM, Bernuzzi, Francesca Veronica, Chan, LL, Heathcote, EJ, Mason, AL, Myers, RP, Odin, JA, Luketic, VA, Bacon, BR, Bodenheimer, HC Jr, Gregersen, PK, Gershwin, ME, deAndrade, M, Amos, CI, Italian PBC Genetics Study Group, Lazaridis, KN, Seldin, MF, Siminovitch, KA, Almasio, PL, Battezzati, PM, Crocè, LS, Niro, GA, STRAZZABOSCO, MARIO, Zuin, M., Juran, B, Hirschfield, G, Invernizzi, P, Atkinson, E, Li, Y, Xie, G, Kosoy, R, Ransom, M, Sun, Y, Bianchi, I, Schlicht, E, Lleo, A, Coltescu, C, Bernuzzi, F, Podda, M, Lammert, C, Shigeta, R, Chan, L, Balschun, T, Marconi, M, Cusi, D, Heathcote, E, Mason, A, Myers, R, Milkiewicz, P, Odin, J, Luketic, V, Bacon, B, Bodenheimer, H, Liakina, V, Vincent, C, Levy, C, Franke, A, Gregersen, P, Bossa, F, Gershwin, M, Deandrade, M, Amos, C, Italian PBC Genetics Study, G, Lazaridis, K, Seldin, M, Siminovitch, K, Almasio, P, Alvaro, D, Andreone, P, Andriulli, A, Barlassina, C, Battezzati, P, Benedetti, A, Bragazzi, M, Brunetto, M, Bruno, S, Caliari, L, Casella, G, Civardi, F, Coco, B, Colli, A, Colombo, M, Colombo, S, Cursaro, C, Crocè, L, Crosignani, A, Donato, F, Fabris, L, Ferrari, C, Floreani, A, Fontana, R, Galli, A, Grattagliano, I, Lazzari, R, Macaluso, F, Malinverno, F, Marra, F, Marzioni, M, Mascia, E, Mattalia, A, Montanari, R, Morini, L, Morisco, F, Muratori, L, Muratori, P, Niro, G, Picciotto, A, Portincasa, P, Prati, D, Rosina, F, Rossi, S, Selmi, C, Spinzi, G, Strazzabosco, M, Tarallo, S, Tiribelli, C, Toniutto, P, Vinci, M, Zuin, M, Juran, BD, Hirschfield, GM, INVERNIZZI, PIETRO, Atkinson, EJ, Schlicht, EM, Bernuzzi, Francesca Veronica, Chan, LL, Heathcote, EJ, Mason, AL, Myers, RP, Odin, JA, Luketic, VA, Bacon, BR, Bodenheimer, HC Jr, Gregersen, PK, Gershwin, ME, deAndrade, M, Amos, CI, Italian PBC Genetics Study Group, Lazaridis, KN, Seldin, MF, Siminovitch, KA, Almasio, PL, Battezzati, PM, Crocè, LS, Niro, GA, STRAZZABOSCO, MARIO, and Zuin, M.

Abstract

To further characterize the genetic basis of primary biliary cirrhosis (PBC), we genotyped 2426 PBC patients and 5731 unaffected controls from three independent cohorts using a single nucleotide polymorphism (SNP) array (Immunochip) enriched for autoimmune disease risk loci. Meta-analysis of the genotype data sets identified a novel disease-associated locus near the TNFSF11 gene at 13q14, provided evidence for association at six additional immune-related loci not previously implicated in PBC and confirmed associations at 19 of 22 established risk loci. Results of conditional analyses also provided evidence for multiple independent association signals at four risk loci, with haplotype analyses suggesting independent SNP effects at the 2q32 and 16p13 loci, but complex haplotype driven effects at the 3q25 and 6p21 loci. By imputing classical HLA alleles from this data set, four class II alleles independently contributing to the association signal from this region were identified. Imputation of genotypes at the non-HLA loci also provided additional associations, but none with stronger effects than the genotyped variants. An epistatic interaction between the IL12RB2 risk locus at 1p31and the IRF5 risk locus at 7q32 was also identified and suggests a complementary effect of these loci in predisposing to disease. These data expand the repertoire of genes with potential roles in PBC pathogenesis that need to be explored by follow-up biological studies.

Published
2012

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