Abstract：
:Biallelic somatic mutations of TCF1 coding for hepatocyte nuclear factor 1alpha (HNF1alpha) are found in 50% of the hepatocellular adenoma (HCA) cases usually associated with oral contraception. In rare cases, HNF1alpha germ line mutations could also predispose to familial adenomatosis. In order to identify new genetic factors predisposing to HNF1alpha-mutated HCA, we searched for mutations in genes involved in the metabolism of estrogen. For 10 genes (CYP1A1, CYP1A2, CYP3A4, CYP3A5, COMT, UGT2B7, NQO1, GSTM1, GSTP1, and GSTT1), we did not find mutations nor differences in the allele distribution among 32 women presenting HNF1alpha-mutated adenomas compared with 58 controls. In contrast, we identified a CYP1B1 germ line heterozygous mutation in 4 of 32 women presenting HNF1alpha-mutated adenomas compared with none in 58 controls. We confirmed these results with the identification of four additional CYP1B1 mutations in a second series of 26 cases. No mutations were found in the control group, which was extended to 98 individuals, and only a known rare genetic variant was observed in two controls (P = 0.0003). We did an ethoxyresorufin O-deethylase assay to evaluate the functional consequence of the CYP1B1 mutations. We found reduced enzymatic activity in each CYP1B1 variant. In addition, an E229K CYP1B1 mutation was found in a woman with a germ line HNF1alpha mutation in a familial adenomatosis context. In this large family, all three patients with adenomatosis bore both HNF1 and CYP1B1 germ line mutations. In conclusion, our data suggested that CYP1B1 germ line-inactivating mutations might increase the incidence of HCA in women with HNF1alpha mutations.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Jeannot E,Poussin K,Chiche L,Bacq Y,Sturm N,Scoazec JY,Buffet C,Van Nhieu JT,Bellanné-Chantelot C,de Toma C,Laurent-Puig P,Bioulac-Sage P,Zucman-Rossi Jdoi
10.1158/0008-5472.CAN-06-3947subject
Has Abstractpub_date
2007-03-15 00:00:00pages
2611-6issue
6eissn
0008-5472issn
1538-7445pii
67/6/2611journal_volume
67pub_type
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