Aretz, Stefan and Stienen, D. and Uhlhaas, S. and Stolte, M. and Entius, M. M. and Loff, S. and Back, W. and Kaufmann, A. and Keller, K-M and Blaas, S. H. and Siebert, R. and Vogt, S. and Spranger, S. and Holinski-Feder, E. and Sunde, L. and Propping, P. and Friedl, W. (2007) High proportion of large genomic deletions and a genotype phenotype update in 80 unrelated families with juvenile polyposis syndrome. JOURNAL OF MEDICAL GENETICS, 44 (11). pp. 702-709. ISSN 0022-2593, 1468-6244
Full text not available from this repository. (Request a copy)Abstract
Background: In patients with juvenile polyposis syndrome (JPS) the frequency of large genomic deletions in the SMAD4 and BMPR1A genes was unknown. Methods: Mutation and phenotype analysis was used in 80 unrelated patients of whom 65 met the clinical criteria for JPS (typical JPS) and 15 were suspected to have JPS. Results: By direct sequencing of the two genes, point mutations were identified in 30 patients (46% of typical JPS). Using MLPA, large genomic deletions were found in 14% of all patients with typical JPS (six deletions in SMAD4 and three deletions in BMPR1A). Mutation analysis of the PTEN gene in the remaining 41 mutation negative cases uncovered a point mutation in two patients (5%). SMAD4 mutation carriers had a significantly higher frequency of gastric polyposis (73%) than did patients with BMPR1A mutations (8%) (p < 0.001); all seven cases of gastric cancer occurred in families with SMAD4 mutations. SMAD4 mutation carriers with gastric polyps were significantly older at gastroscopy than those without (p < 0.001). In 22% of the 23 unrelated SMAD4 mutation carriers, hereditary hemorrhagic telangiectasia (HHT) was also diagnosed clinically. The documented histologic findings encompassed a wide distribution of different polyp types, comparable with that described in hereditary mixed polyposis syndromes (HMPS). Conclusions: Screening for large deletions raised the mutation detection rate to 60% in the 65 patients with typical JPS. A strong genotype-phenotype correlation for gastric polyposis, gastric cancer, and HHT was identified, which should have implications for counselling and surveillance. Histopathological results in hamartomatous polyposis syndromes must be critically interpreted.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HEREDITARY HEMORRHAGIC TELANGIECTASIA; MOLECULAR CLASSIFICATION; COLORECTAL-CANCER; GASTRIC POLYPOSIS; BMPR1A MUTATIONS; GENE; MADH4; SMAD4; IDENTIFICATION; FEATURES; |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Innere Medizin I |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 30 Nov 2020 14:02 |
| Last Modified: | 30 Nov 2020 14:02 |
| URI: | https://pred.uni-regensburg.de/id/eprint/31987 |
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