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2 results on '"Croce, Ls"'

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. Classical HLA-DRB1 and DPB1 alleles account for HLA associations with primary biliary cirrhosis

Author

Invernizzi, P, Ransom, M, Raychaudhuri, S, Kosoy, R, Lleo, A, Shigeta, R, Franke, A, Bossa, F, Amos, C, Gregersen, P, Siminovitch, K, Cusi, D, de Bakker, P, Podda, M, Gershwin, M, Seldin, M, 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, Civardi, F, Coco, B, Colli, A, Colombo, M, Colombo, S, Cursaro, C, Croce, L, Crosignani, A, Donato, F, Fabris, L, Ferrari, C, Floreani, A, Galli, A, Grattagliano, I, Lazzari, R, Macaluso, F, Marra, F, Marzioni, M, Mattalia, A, Montanari, R, Morini, L, Morisco, F, Moroni, L, Muratori, L, Muratori, P, Niro, G, Picciotto, A, Portincasa, P, Prati, D, Prisco, C, Rosina, F, Rossi, S, Selmi, C, Spinzi, G, Strazzabosco, M, Tarallo, S, Tiribelli, C, Toniutto, P, Vinci, M, Zuin, M, INVERNIZZI, PIETRO, Amos, CI, Gregersen, PK, Siminovitch, KA, de Bakker, PI, Gershwin, ME, Seldin, MF, Almasio, PL, Bernuzzi, Francesca Veronica, Bragazzi, MC, Croce, LS, STRAZZABOSCO, MARIO, Zuin, M., Invernizzi, P, Ransom, M, Raychaudhuri, S, Kosoy, R, Lleo, A, Shigeta, R, Franke, A, Bossa, F, Amos, C, Gregersen, P, Siminovitch, K, Cusi, D, de Bakker, P, Podda, M, Gershwin, M, Seldin, M, 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, Civardi, F, Coco, B, Colli, A, Colombo, M, Colombo, S, Cursaro, C, Croce, L, Crosignani, A, Donato, F, Fabris, L, Ferrari, C, Floreani, A, Galli, A, Grattagliano, I, Lazzari, R, Macaluso, F, Marra, F, Marzioni, M, Mattalia, A, Montanari, R, Morini, L, Morisco, F, Moroni, L, Muratori, L, Muratori, P, Niro, G, Picciotto, A, Portincasa, P, Prati, D, Prisco, C, Rosina, F, Rossi, S, Selmi, C, Spinzi, G, Strazzabosco, M, Tarallo, S, Tiribelli, C, Toniutto, P, Vinci, M, Zuin, M, INVERNIZZI, PIETRO, Amos, CI, Gregersen, PK, Siminovitch, KA, de Bakker, PI, Gershwin, ME, Seldin, MF, Almasio, PL, Bernuzzi, Francesca Veronica, Bragazzi, MC, Croce, LS, STRAZZABOSCO, MARIO, and Zuin, M.

Abstract

Susceptibility to primary biliary cirrhosis (PBC) is strongly associated with human leukocyte antigen (HLA)-region polymorphisms. To determine if associations can be explained by classical HLA determinants, we studied Italian, 676 cases and 1440 controls, genotyped with dense single-nucleotide polymorphisms (SNPs) for which classical HLA alleles and amino acids were imputed. Although previous genome-wide association studies and our results show stronger SNP associations near DQB1, we demonstrate that the HLA signals can be attributed to classical DRB1 and DPB1 genes. Strong support for the predominant role of DRB1 is provided by our conditional analyses. We also demonstrate an independent association of DPB1. Specific HLA-DRB1 genes (*08, *11 and *14) account for most of the DRB1 association signal. Consistent with previous studies, DRB1*08 (P=1.59 × 10(-11)) was the strongest predisposing allele, whereas DRB1*11 (P=1.42 × 10(-10)) was protective. Additionally, DRB1*14 and the DPB1 association (DPB1*03:01; P=9.18 × 10(-7)) were predisposing risk alleles. No signal was observed in the HLA class 1 or class 3 regions. These findings better define the association of PBC with HLA and specifically support the role of classical HLA-DRB1 and DPB1 genes and alleles in susceptibility to PBC.

Published
2012

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