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Büki G, Antal G, Bene J. Rare Germline Variants in the Adenomatous Polyposis Coli Gene Associated with Dental and Osseous Anomalies. Int J Mol Sci 2024; 25:8189. [PMID: 39125758 PMCID: PMC11312143 DOI: 10.3390/ijms25158189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2024] [Accepted: 07/24/2024] [Indexed: 08/12/2024] Open
Abstract
APC is a tumor suppressor gene that exerts its effect through the regulation of the Wnt signaling pathway. Loss of function mutations of the gene are associated with familial adenomatous polyposis (FAP). Early diagnosis in FAP patients is essential to prevent the development of colorectal cancer. Extraintestinal manifestations often precede the formation of the polyposis; therefore, these manifestations may serve as a clinical indicator for the condition. The aim of this study was to assess genotype-phenotype associations between the location of APC mutations and various extraintestinal features, mainly focusing on osseous and dental anomalies. Analyses of our cases and the mutations available in the literature with these manifestations revealed that mutations in the N-terminal region (amino acids 1-~1000) of the protein are more frequently associated with only osseous anomalies, whereas dental manifestations are more prevalent in mutations in the middle region (amino acids 1000-~2100). In addition, supernumerary teeth were found to be the most common dental feature. Since dental abnormalities often precede intestinal polyposis, dentists have a crucial role in the early identification of patients at risk.
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Affiliation(s)
- Gergely Büki
- Department of Medical Genetics, Clinical Center, Medical School, University of Pécs, 7624 Pécs, Hungary;
| | - Gréta Antal
- Department of Dentistry, Oral and Maxillofacial Surgery, Clinical Center, Medical School, University of Pécs, 7623 Pécs, Hungary;
| | - Judit Bene
- Department of Medical Genetics, Clinical Center, Medical School, University of Pécs, 7624 Pécs, Hungary;
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Tiplica GS, Fritz K, Butacu AI, Ungureanu L, Sălăvăstru CM. Gutartige nichtmelanozytäre Hauttumoren bei Syndromen. Hautarzt 2022; 73:114-126. [DOI: 10.1007/s00105-022-04947-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/07/2022] [Indexed: 12/24/2022]
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de Oliveira JC, Viana DV, Zanardo C, Santos EMM, de Paula AE, Palmero EI, Rossi BM. Genotype-phenotype correlation in 99 familial adenomatous polyposis patients: A prospective prevention protocol. Cancer Med 2019; 8:2114-2122. [PMID: 30897307 PMCID: PMC6536935 DOI: 10.1002/cam4.2098] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 02/05/2019] [Accepted: 02/27/2019] [Indexed: 12/29/2022] Open
Abstract
Background Familial adenomatous polyposis (FAP) is a syndrome caused by germline pathogenic variants in the tumor suppressor gene adenomatous polyposis coli (APC). Identification of APC pathogenic variants sites and the genotype‐phenotype correlation are important for characterizing, monitoring, and treating members of affected families. The aim of this study was to correlate genotype‐phenotype of Brazilian individuals carrying APC pathogenic germline variants and that have FAP. Methods The polyposis phenotype of 99 individuals from 35 families between July 2013 and December 2014 were prospectively evaluated based on the InSIGHT polyposis staging classification. Seven extra‐colonic manifestations were assessed and the clinical manifestations correlated with the APC genotype. Results The age of the study participants ranged from 12 to 67 years (median of 29 years). Twenty‐six APC pathogenic variants were identified. Fifty‐five cases harbored nonsense pathogenic variants (55.6%). Frameshift alterations were noted in 39 cases (39.4%). Aberrant splicing was noted in 1 case (1%). Rearrangements were observed in 3 cases (3%). An association between nonsense variants and rearrangement was noted in 1 case (1%). The genotype‐phenotype correlation analysis led the identification of classic FAP in 94 cases (94.9%). Profuse polyposis was identified in 5 cases (5.1%). Thirty‐six cases were diagnosed with cancer of which 29 cases (80.6%) were colorectal cancer, 1 case (2.7%) was brain cancer, 4 cases (11.2%) were papillary thyroid cancer, and 2 cases (5.5%) were stomach cancer. The extra‐colonic manifestations included 9 individuals with desmoids tumors, 10 with osteomas, and 9 with congenital hypertrophy of the retinal pigment epithelium. Conclusions The genotype‐phenotype correlation in Brazilian individuals with FAP revealed specific findings not previously reported for other cohorts, demonstrating the relevance of knowledge regarding the variable pathogenic variants and clinical presentation in different populations for adequate individual clinical management of patients harboring this medical condition.
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Affiliation(s)
| | - Danilo V Viana
- Oncogenetics Department, Barretos Cancer Hospital, Barretos, SP, Brazil
| | - Cleyton Zanardo
- Biostatistics Department, Barretos Cancer Hospital, Barretos, SP, Brazil
| | - Erika M M Santos
- Cancer Genetics, Oncology Department, Sírio Libanes Hospital, São Paulo, Brazil
| | - André E de Paula
- Center of Molecular Diagnosis, Barretos Cancer Hospital, Barretos, SP, Brazil.,Molecular Oncology Research Center, Barretos Cancer Hospital, Barretos, SP, Brazil
| | - Edenir I Palmero
- Center of Molecular Diagnosis, Barretos Cancer Hospital, Barretos, SP, Brazil.,Molecular Oncology Research Center, Barretos Cancer Hospital, Barretos, SP, Brazil.,Barretos School of Health Sciences, Dr. Paulo Prata - FACISB, Barretos, SP, Brazil
| | - Benedito M Rossi
- Cancer Genetics, Oncology Department, Sírio Libanes Hospital, São Paulo, Brazil
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Loncarevic S, Brajkovic D, Popovic M, Gardasevic M, Sekulic M, Matejic S. The Surgical Management of Gardner Syndrome Manifestation in the Maxillofacial Region: A Case Report. SERBIAN JOURNAL OF EXPERIMENTAL AND CLINICAL RESEARCH 2019. [DOI: 10.1515/sjecr-2017-0038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
ApstraktGardner syndrome is a rare autosomal-dominant genetic disorder, considered a variant of familial adenomatous polyposis. It is characterized by intestinal polyposis and various bone and soft-tissue tumors, including osteomas, epidermal and dermal cysts, lipomas and fibromas. Intestinal polyps have high potential to become malignant, and the screening of intestinal lesions is mandatory. Maxillofacial manifestations, such as jaw osteomas, odontomas, dental abnormalities and soft tissue tumors frequently precede the intestinal manifestations. Thus, maxillofacial surgeons and dental practitioners may have important role in early detection of Gardner syndrome. In this case report we present a 22 year old male patient who was reffered to maxillofacial surgeon due to osteoma of the mandible. After obtaining clinical and radiological examinations, as well as data from family history, Gardner syndrome was suspected, which was later confirmed after gastroenterological examination.
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Affiliation(s)
- Slobodan Loncarevic
- Department of dentistry , University of Kragujevac , Serbia , Faculty of medical sciences
- Clinic for Maxillofacial surgery, Military Medical Academy , Belgrade , Serbia
| | - Denis Brajkovic
- Department of dentistry , University of Kragujevac , Serbia , Faculty of medical sciences
| | - Milica Popovic
- Department of dentistry , University of Kragujevac , Serbia , Faculty of medical sciences
| | - Milka Gardasevic
- Clinic for Maxillofacial surgery, Military Medical Academy , Belgrade , Serbia
| | - Miona Sekulic
- Department of dentistry , University of Kragujevac , Serbia , Faculty of medical sciences
| | - Suzana Matejic
- Department of forensic medicine , University of Pristina , Serbia , Faculty of medicine situated in Kosovska Mitrovica , Kosovo , Srbija
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5
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Baldino ME, Koth VS, Silva DN, Figueiredo MA, Salum FG, Cherubini K. Gardner syndrome with maxillofacial manifestation: A case report. SPECIAL CARE IN DENTISTRY 2018; 39:65-71. [PMID: 30417483 DOI: 10.1111/scd.12339] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 10/29/2018] [Accepted: 10/30/2018] [Indexed: 11/28/2022]
Abstract
Gardner syndrome is a hereditary disease in which patients develop gastrointestinal polyps, osteomas, desmoid tumors, epidermoid cysts, fibromas, lipomas, and retinal lesions. Dental abnormalities such as supernumerary or impacted teeth, odontomas and dentigerous cysts are also reported. The most serious concern in this syndrome is the extremely high risk of gastrointestinal polyps undergoing malignant transformation. Since the maxillofacial findings usually precede gastrointestinal polyps, the dentist plays a crucial role in the diagnosis of Gardner syndrome, and panoramic radiography is an important tool in the diagnosis of the disease. We report here a case of Gardner syndrome in a patient showing mandibular osteomas and impacted teeth. Also, cases of Gardner syndrome with maxillofacial manifestations reported in the literature were reviewed and compared with ours. According to the findings, osteomas are important manifestations of this syndrome, and regardless of the absence of family history of intestinal polyposis, their occurrence should prompt diagnostic evaluation for this disease.
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Affiliation(s)
- Maria Eduarda Baldino
- Postgraduate Program, Dental College, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Valesca Sander Koth
- Postgraduate Program, Dental College, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | | | - Maria Antonia Figueiredo
- Postgraduate Program, Dental College, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Fernanda Gonçalves Salum
- Postgraduate Program, Dental College, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Karen Cherubini
- Postgraduate Program, Dental College, Pontifical Catholic University of Rio Grande do Sul, Porto Alegre, RS, Brazil
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Chang RS, Yao XF, Wu YH. Spectrum of Hybrid Cysts and Their Clinical Significance. Am J Dermatopathol 2018; 40:397-400. [DOI: 10.1097/dad.0000000000001006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Spoto CP, Gullo I, Carneiro F, Montgomery EA, Brosens LA. Hereditary gastrointestinal carcinomas and their precursors: An algorithm for genetic testing. Semin Diagn Pathol 2018; 35:170-183. [DOI: 10.1053/j.semdp.2018.01.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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8
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Multiple Hybrid Cysts in a Child: Answer. Am J Dermatopathol 2017; 40:70-71. [PMID: 29286977 DOI: 10.1097/dad.0000000000000715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Hereditary Colorectal Polyposis and Cancer Syndromes: A Primer on Diagnosis and Management. Am J Gastroenterol 2017; 112:1509-1525. [PMID: 28786406 DOI: 10.1038/ajg.2017.212] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Accepted: 06/23/2017] [Indexed: 02/06/2023]
Abstract
Colorectal cancer (CRC) is the fourth most common cancer amongst men and women. Between 3 and 6% of all CRCs are attributed to well-defined inherited syndromes, including Lynch syndrome, familial adenomatous polyposis (FAP), MUTYH-associated polyposis (MAP), and several hamartomatous polyposis conditions. Identification of these patients through family history and appropriate genetic testing can provide estimates of cancer risk that inform appropriate cancer screening, surveillance and/or preventative interventions. This narrative review examines the hereditary colorectal cancer and polyposis syndromes, their genetic basis, clinical management, and evidence supporting cancer screening.
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Abstract
Benign and malignant soft tissue tumors usually develop de novo without identifiable risk factors or predisposing conditions. However, in recent decades, soft tissue tumors have been increasingly recognized to be associated with diverse hereditary tumor syndromes as a consequence of germline mutations involving mainly tumor suppressor genes, but rarely also affecting proto-oncogenes. This is mainly the consequence of increasing application of modern genetic analysis tools, such as next-generation sequencing (NGS) and whole genome analyses. Syndrome-associated soft tissue tumors frequently show distinctive clinicopathological features and peculiarities that facilitate and potentially enhance their recognition and identification during routine surgical pathology practice. As it is not uncommon that pathologists are the first medical specialists to recognize a potential hereditary etiology of neoplastic diseases on the basis of specific pathological features, it is mandatory that pathologists be familiar with the main features that characterize those soft tissue tumors with inherited etiology, at least the most common and important of them. This review summarizes the main syndromes and their associated soft tissue tumors and discusses their characteristic pathological features that help in the recognition of hereditary syndromes.
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Clouthier K, Trecartin A, Saintilus I, Jean-Baptiste B, Charles P, Eyssallenne A, Stein J, Ford H, Silverman A. Management of a posterior mediastinal Gardner fibroma causing critical airway stenosis in a resource limited setting. JOURNAL OF PEDIATRIC SURGERY CASE REPORTS 2017. [DOI: 10.1016/j.epsc.2017.02.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
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12
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Childhood neuroendocrine tumours: a descriptive study revealing clues for genetic predisposition. Br J Cancer 2016; 116:163-168. [PMID: 27959889 PMCID: PMC5243994 DOI: 10.1038/bjc.2016.408] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Revised: 10/12/2016] [Accepted: 11/14/2016] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Neuroendocrine tumours (NETs) are rare in children and limited data are available. We aimed to specify tumour and patient characteristics and to investigate the role of genetic predisposition in the aetiology of paediatric NETs. METHODS Using the Dutch Pathology Registry PALGA, we collected patient- and tumour data of paediatric NETs in the Netherlands between 1991 and 2013 (N=483). RESULTS The incidence of paediatric NETs in the Netherlands is 5.40 per one million per year. The majority of NETs were appendiceal tumours (N=441;91.3%). Additional surgery in appendiceal NETs was indicated in 89 patients, but performed in only 27 of these patients. Four out of five patients with pancreatic NETs were diagnosed with Von Hippel-Lindau disease (N=2) and Multiple Endocrine Neoplasia type 1 (N=2). In one patient with an appendiceal NET Familial Adenomatous Polyposis was diagnosed. On the basis of second primary tumours or other additional diagnoses, involvement of genetic predisposition was suggestive in several others. CONCLUSIONS We identified a significant number of patients with a confirmed or suspected tumour predisposition syndrome and show that paediatric pancreatic NETs in particular are associated with genetic syndromes. In addition, we conclude that treatment guidelines for appendiceal paediatric NETs need revision and improved implementation.
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Almeida FT, Pachêco-Pereira C, Porporatti AL, Flores-Mir C, Leite AF, De Luca Canto G, Guerra ENS. Oral manifestations in patients with familial adenomatous polyposis: A systematic review and meta-analysis. J Gastroenterol Hepatol 2016; 31:527-40. [PMID: 26331960 DOI: 10.1111/jgh.13149] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 08/17/2015] [Accepted: 08/21/2015] [Indexed: 12/16/2022]
Abstract
BACKGROUND AND AIM The oral manifestations of familial adenomatous polyposis (FAP) have been reported in the recent literature. Therefore, there has been growing interest in the characterization of the dento-osseous anomalies because they may precede colorectal cancer and may be used as a diagnostic marker. This systematic review and meta-analysis was performed to evaluate the published evidence for what are the oral manifestations of FAP and their frequency in affected individuals. METHODS The search was performed at Cochrane Library, EMBASE, LILACS, PubMed, Scopus, and Web of Science for articles published up to March 2015. A grey literature search was conducted through Google Scholar. Reference lists of the included articles and additional studies identified by expert were screened for potential relevant studies. The methodology of selected studies was evaluated using the risk of bias checklist of the Agency for Healthcare Research and Quality. RESULTS Twenty observational studies totalizing 1635 individuals affected by FAP met the inclusion criteria. Osseous, dental, and oral mucosa alterations were observed in FAP patients. The meta-analysis showed the frequency of osseous jaw lesions, and the dental anomalies were 65.35% and 30.48%, respectively, and two studies suggested that oral mucosa vascular density is a phenotypic manifestation in patients with FAP. Most of the studies were evaluated as moderate risk of bias. CONCLUSION The most frequent oral manifestation on FAP patients is osseous jaw alterations. In the future, well-designed studies are necessary to classify osseous and dental anomalies in order to demonstrate the true prevalence of each alteration separately.
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Affiliation(s)
| | - Camila Pachêco-Pereira
- School of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta,, Canada
| | - André Luís Porporatti
- Department of Dentistry, Federal University of Santa Catarina, Florianopolis, Brazil.,Department of Prosthodontics, Section of Orofacial Pain, Bauru School of Dentistry, University of São Paulo, Bauru, SP,, Brazil
| | - Carlos Flores-Mir
- School of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta,, Canada
| | - André Ferreira Leite
- Oral Histopathology Laboratory, Health Sciences Faculty, University of Brasília, Brasília, Brazil
| | - Graziela De Luca Canto
- School of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta,, Canada.,Department of Dentistry, Federal University of Santa Catarina, Florianopolis, Brazil
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Nusliha A, Dalpatadu U, Amarasinghe B, Chandrasinghe PC, Deen KI. Congenital hypertrophy of retinal pigment epithelium (CHRPE) in patients with familial adenomatous polyposis (FAP); a polyposis registry experience. BMC Res Notes 2014; 7:734. [PMID: 25326340 PMCID: PMC4210554 DOI: 10.1186/1756-0500-7-734] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2014] [Accepted: 10/10/2014] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND Familial Adenomatous Polyposis (FAP) is an autosomal dominant condition giving rise to multiple adenomatous polyps in the colon which invariably become malignant by the fourth decade. Congenital hypertrophy of retinal pigment epithelium (CHRPE) is one of its extra intestinal manifestations early in childhood seen, present in 90% of FAP population and is easy to detect. FINDINGS Patients diagnosed with FAP and at risk first degree family members were screened for CHRPE using a slit lamp and indirect ophthalmoscopy. The retina of 17 diagnosed FAP patients and 13 individuals at risk were examined. The site and size of CHRPE lesions were documented. Thirteen (76%) of 17 FAP patients (male-10, female - 7, median age - 30 years; range 15-55 years) had CHRPE lesions; seven (54%) had bilateral CHRPE lesions and six (46%) had unilateral lesions. A single lesion was detected in 6 (46%) while 7 (54%) patients had multiple lesions. Of 13 at risk individuals (7- male, female-6 ; median age 34; range 16-52 years), one was positive for CHRPE and 12 were free of retinal lesions. The sensitivity of the presence of a CHRPE lesion in association with colonic polyps in FAP was 76%, specificity 92%, positive predictive value 93%, and negative predictive value 75%. CONCLUSIONS This study found a high sensitivity and specificity for a CHRPE lesion to be associated with colonic polyps of FAP and hence a useful screening method in a burdened health-care system. The method is minimally invasive and simple and would be of particular value in screening children at risk for FAP.
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Affiliation(s)
- Anwer Nusliha
- />North Colombo Teaching Hospital, Ragama, Sri Lanka
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Aihara H, Kumar N, Thompson CC. Diagnosis, surveillance, and treatment strategies for familial adenomatous polyposis: rationale and update. Eur J Gastroenterol Hepatol 2014; 26:255-62. [PMID: 24161962 PMCID: PMC5019104 DOI: 10.1097/meg.0000000000000010] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Familial adenomatous polyposis is characterized by the development of multiple (>100) colorectal adenomas throughout the colorectum. This disorder can be caused by a germline mutation in the adenomatous polyposis coli gene and can be diagnosed either clinically or genetically. After diagnosis with the condition, patients should undergo prophylactic proctocolectomy with a neoreservoir, usually an ileoanal pouch, at an appropriate time. Individuals with a family history of this disease who have not been diagnosed should be advised to attend genetic counseling and to enroll in appropriate clinical and genetic surveillance programs. Recent progress in endoscopic technology, including high-resolution endoscopy, capsule endoscopy, and double-balloon endoscopy, has made possible more detailed and wide-ranging investigation of the gastrointestinal tract. Although there has been limited evidence, further studies on these new endoscopic technologies might alter the surveillance strategies for familial adenomatous polyposis.
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Affiliation(s)
- Hiroyuki Aihara
- Division of Gastroenterology and Hepatology, Brigham and Women's Hospital, Boston, Massachusetts, USA
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Toki H, Inoue M, Motegi H, Minowa O, Kanda H, Yamamoto N, Ikeda A, Karashima Y, Matsui J, Kaneda H, Miura I, Suzuki T, Wakana S, Masuya H, Gondo Y, Shiroishi T, Akiyama T, Yao R, Noda T. Novel mouse model for Gardner syndrome generated by a large-scale N-ethyl-N-nitrosourea mutagenesis program. Cancer Sci 2013; 104:937-44. [PMID: 23551873 PMCID: PMC7657124 DOI: 10.1111/cas.12161] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2012] [Revised: 03/21/2013] [Accepted: 03/27/2013] [Indexed: 12/26/2022] Open
Abstract
Mutant mouse models are indispensable tools for clarifying the functions of genes and elucidating the underlying pathogenic mechanisms of human diseases. We carried out large-scale mutagenesis using the chemical mutagen N-ethyl-N-nitrosourea. One specific aim of our mutagenesis project was to generate novel cancer models. We screened 7012 animals for dominant traits using a necropsy test and thereby established 17 mutant lines predisposed to cancer. Here, we report on a novel cancer model line that developed osteoma, trichogenic tumor, and breast cancer. Using fine mapping and genomic sequencing, we identified a point mutation in the adenomatous polyposis coli (Apc) gene. The Apc1576 mutants bear a nonsense mutation at codon 1576 in the Apc gene. Although most Apc mutant mice established thus far have multifocal intestinal tumors, mice that are heterozygous for the Apc1576 mutation do not develop intestinal tumors; instead, they develop multifocal breast cancers and trichogenic tumors. Notably, the osteomas that develop in the Apc1576 mutant mice recapitulate the lesion observed in Gardner syndrome, a clinical variant of familial adenomatous polyposis. Our Apc1576 mutant mice will be valuable not only for understanding the function of the Apc gene in detail but also as models of human Gardner syndrome.
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Affiliation(s)
- Hideaki Toki
- Team for Advanced Development and Evaluation of Human Disease Models, Riken BioResource Center, Tsukuba, Japan
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Abstract
Adenomatous polyposis coli (APC) is best known for its crucial role in colorectal cancer suppression. Rodent models with various Apc mutations have enabled experimental validation of different Apc functions in tumors and normal tissues. Since the development of the first mouse model with a germline Apc mutation in the early 1990s, 20 other Apc mouse and rat models have been generated. This article compares and contrasts currently available Apc rodent models with particular emphasis on providing potential explanations for their reported variation in three areas: (i) intestinal polyp multiplicity, (ii) intestinal polyp distribution, and (iii) extraintestinal phenotypes.
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Affiliation(s)
- Maged Zeineldin
- Department of Molecular Biosciences, University of Kansas, 1200 Sunnyside Ave. Lawrence, KS 66045 USA
| | - Kristi L. Neufeld
- Department of Molecular Biosciences, University of Kansas, 1200 Sunnyside Ave. Lawrence, KS 66045 USA
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Zeineldin M, Neufeld KL. More than two decades of Apc modeling in rodents. Biochim Biophys Acta Rev Cancer 2013; 1836:80-9. [PMID: 23333833 DOI: 10.1016/j.bbcan.2013.01.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2012] [Revised: 12/31/2012] [Accepted: 01/03/2013] [Indexed: 02/07/2023]
Abstract
Mutation of tumor suppressor gene adenomatous polyposis coli (APC) is an initiating step in most colon cancers. This review summarizes Apc models in mice and rats, with particular concentration on those most recently developed, phenotypic variation among different models, and genotype/phenotype correlations.
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Affiliation(s)
- Maged Zeineldin
- Department of Molecular Biosciences, University of Kansas, 1200 Sunnyside Ave., Lawrence, KS 66045, USA
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Bhusnurmath S, Hoch B. Benign Bone-Forming Tumors: Approach to Diagnosis and Current Understanding of Pathogenesis. Surg Pathol Clin 2011; 5:101-16. [PMID: 26837917 DOI: 10.1016/j.path.2011.07.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The diagnosis of benign bone-forming tumors continues to be based on the traditional approach to bone tumor diagnosis using knowledge of the spectrum of histopathologic features seen in these tumors in combination with clinical and radiological correlation. This review emphasizes the pathologic features and the clinical and radiological features that the surgical pathologist must have a working understanding of to make an accurate diagnosis and avoid confusion with other lesions, particularly osteosarcoma. New and persistent challenges facing the practicing pathologist and our current understanding of the cytogenetic and molecular abnormalities involved in the pathogenesis of these tumors are discussed.
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Affiliation(s)
- Shefali Bhusnurmath
- Department of Pathology, University of Washington, 1959 NE Pacific Street, Box 356100, Room NE110, Seattle, WA 98195, USA
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Burger B, Cattani N, Trueb S, de Lorenzo R, Albertini M, Bontognali E, Itin C, Schaub N, Itin PH, Heinimann K. Prevalence of skin lesions in familial adenomatous polyposis: a marker for presymptomatic diagnosis? Oncologist 2011; 16:1698-705. [PMID: 22135120 DOI: 10.1634/theoncologist.2011-0244] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND AND AIMS Benign skin tumors such as lipomas, fibromas, and epidermal cysts are among the extracolonic manifestations of familial adenomatous polyposis (FAP). Readily detectable by inspection, they could serve as presymptomatic diagnostic markers to identify FAP patients. We therefore prospectively determined the prevalence of cutaneous lesions in genetically confirmed adenomatous polyposis coli (APC) mutation carriers and assessed their potential usefulness in the identification of FAP patients. METHODS Whole-skin examination was performed in 56 adult APC mutation carriers, compared with a control group (n = 116). In addition, FAP patients were investigated for the presence of congenital hypertrophy of the retinal pigment epithelium (CHRPE), an established clinical marker for FAP, and a detailed review of medical records was performed. RESULTS Nearly half of all FAP patients (48.2%) had at least one FAP-associated skin lesion, compared with one third (34.5%) of controls. Only multiple lipomas and combined skin lesions were significantly more prevalent in APC mutation carriers. CHRPE was observed in 22 (43.1%) of 51 FAP patients, including 14 (37.8%) of 37 individuals with APC mutations outside the CHRPE-associated region between codons 311 and 1465. CONCLUSIONS Despite a significantly higher prevalence of multiple lipomas, occurring at younger age, and combined skin lesions in APC mutation carriers, the low diagnostic sensitivity of FAP-associated skin lesions precludes their use as markers for FAP in clinical practice. Based on our findings, the common CHRPE-associated region should be extended to APC codons 148-2043.
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Affiliation(s)
- Bettina Burger
- Research Group of Dermatology, Department of Biomedicine, University Hospital Basel, Basel, Switzerland.
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Power DG, Gloglowski E, Lipkin SM. Clinical genetics of hereditary colorectal cancer. Hematol Oncol Clin North Am 2011; 24:837-59. [PMID: 20816577 DOI: 10.1016/j.hoc.2010.06.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Colorectal cancer (CRC) is a common disease, and approximately 25% of patients have a familial component. High-penetrance singlegene germline mutations conferring a true hereditary susceptibility account for around 5% to 6% of all cases. Lynch syndrome is the most common hereditary form of colorectal cancer. Much of the hereditary component in the remaining familial cases of CRC is likely polygenic, and many of the genetic changes involved are as yet unidentified. This article addresses the most clinically important CRC genetic syndromes.
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Affiliation(s)
- Derek G Power
- Clinical Genetics, Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA
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23
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Fostira F, Thodi G, Sandaltzopoulos R, Fountzilas G, Yannoukakos D. Mutational spectrum of APC and genotype-phenotype correlations in Greek FAP patients. BMC Cancer 2010; 10:389. [PMID: 20649969 PMCID: PMC2918579 DOI: 10.1186/1471-2407-10-389] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2009] [Accepted: 07/22/2010] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Familial adenomatous polyposis, an autosomal dominant inherited disease caused by germline mutations within the APC gene, is characterized by early onset colorectal cancer as a consequence of the intrinsic phenotypic feature of multiple colorectal adenomatic polyps. The genetic investigation of Greek adenomatous polyposis families was performed in respects to APC and MUTYH germline mutations. Additionally, all available published mutations were considered in order to define the APC mutation spectrum in Greece. METHODS A cohort of 25 unrelated adenomatous polyposis families of Greek origin has been selected. Genetic testing included direct sequencing of APC and MUTYH genes. APC gene was also checked for large genomic rearrangements by MLPA. RESULTS Analysis of the APC gene performed in a Greek cohort of twenty five FAP families revealed eighteen different germline mutations in twenty families (80%), four of which novel. Mutations were scattered between exon 3 and codon 1503 of exon 15, while no large genomic rearrangements were identified. CONCLUSION This concise report describes the spectrum of all APC mutations identified in Greek FAP families, including four novel mutations. It is concluded that the Greek population is characterized by genetic heterogeneity, low incidence of genomic rearrangements in APC gene and lack of founder mutation in FAP syndrome.
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Affiliation(s)
- Florentia Fostira
- Molecular Diagnostics Laboratory, I/R-RP, National Center of Scientific Research Demokritos, Athens, Greece
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24
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Anaya DA, Chang GJ, Rodriguez-Bigas MA. Extracolonic manifestations of hereditary colorectal cancer syndromes. Clin Colon Rectal Surg 2010; 21:263-72. [PMID: 20011437 DOI: 10.1055/s-0028-1089941] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Familial colorectal adenocarcinoma (CRC) accounts for approximately 15 to 20% of CRC. Of these, hereditary nonpolyposis colorectal cancer (HNPCC) and familial adenomatous polyposis (FAP) represent the most common hereditary syndromes associated with CRC, followed by other less common diseases including juvenile polyposis (JP) and Peutz-Jeghers syndrome (PJS). Extracolonic manifestations are common in each of these syndromes having significant implications for surveillance and management in at-risk individuals. The authors review the most common and clinically relevant extracolonic manifestations for each of these syndromes focusing on incidence, presentation, genotype/phenotype correlations, and management (including surveillance) strategies.
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Affiliation(s)
- Daniel A Anaya
- Department of Surgical Oncology, The University of Texas M D Anderson Cancer Center, Houston, TX 77230, USA
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25
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Kanitakis J. Adnexal tumours of the skin as markers of cancer-prone syndromes. J Eur Acad Dermatol Venereol 2010; 24:379-87. [DOI: 10.1111/j.1468-3083.2009.03420.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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26
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Cai Y, Mohseny AB, Karperien M, Hogendoorn PCW, Zhou G, Cleton-Jansen AM. Inactive Wnt/beta-catenin pathway in conventional high-grade osteosarcoma. J Pathol 2010; 220:24-33. [PMID: 19882675 DOI: 10.1002/path.2628] [Citation(s) in RCA: 129] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Osteosarcoma is the most common malignant bone tumour, with a peak incidence in children and young adolescents, suggesting a role of rapid bone growth in its pathogenesis. The Wnt/beta-catenin pathway plays a crucial role in skeletal development and is indispensable for osteoblasts' lineage determination. Previous studies suggesting an oncogenic role for the Wnt/beta-catenin pathway in osteosarcoma were based on cytoplasmic staining of beta-catenin or the detection of one component of this pathway. However, those approaches are inappropriate to address whether the Wnt/beta-catenin pathway is functionally active. Therefore, in this study, we examined nuclear beta-catenin expression in 52 human osteosarcoma biopsies, 15 osteoblastomas (benign bone tumours), and four human osteosarcoma cell lines by immunohistochemistry. Furthermore, we modulated Wnt/beta-catenin pathway activity using a GIN (GSK3beta inhibitor) and evaluated its effect on cell growth and osteogenic differentiation. Absence of nuclear beta-catenin staining was found in 90% of the biopsies and all osteosarcoma cell lines, whereas strong nuclear beta-catenin staining was observed in all osteoblastomas. Wnt-luciferase activity was comparable to the negative control in all osteosarcoma cell lines. GIN stimulated the Wnt/beta-catenin pathway, as shown by translocation of beta-catenin into the nucleus and increased Wnt-luciferase activity as well as mRNA expression of AXIN2, a specific downstream target gene. Stimulation of the Wnt/beta-catenin pathway by GIN significantly reduced cell proliferation in the cell lines MG-63 and U-2-OS and enhanced differentiation in the cell lines HOS and SJSA-1, as shown by an increase in alkaline phosphatase (ALP) activity and mineralization. In contrast with the oncogenic role of the Wnt/beta-catenin pathway in osteosarcoma as previous studies suggested, here we demonstrate that this pathway is inactivated in osteosarcoma. Moreover, activation of the Wnt/beta-catenin pathway inhibits cell proliferation or promotes osteogenic differentiation in osteosarcoma cell lines. Our data suggest that loss of Wnt/beta-catenin pathway activity, which is required for osteoblast differentiation, may contribute to osteosarcoma development.
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Affiliation(s)
- Yongping Cai
- Department of Pathology, School of Medicine, Shandong University, Jinan 250012, PR China
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Osuagwu CC, Okafor OC, Ezeome ER, Uche CE, Ememonu C, Kesieme E. Familial Adenomatous Polyposis with Synchronous Invasive Colonic Carcinomas and Metastatic Jejunal Adenocarcinoma in a Nigerian Male. Rare Tumors 2010. [DOI: 10.4081/rt-2010-4-e66] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Familial adenomatous polyposis is rare. Three cases were previously reported in Nigeria. An intriguing feature of this case is an ulcerated jejunal carcinoma which was metastatic rather than synchronous carcinoma. This patient presented with partial large bowel obstruction and the pathological analysis revealed 4 invasive adenocarcinomas, 3 in the colon and 1 in the jejunum (Dukes stage D). Palliative pancolectomy and jejunal tumour resection with chemotherapy was offered to him. He died eight months after surgery from disease progression. The challenges of managing a hereditary cancer syndrome in a resource poor country are highlighted.
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Affiliation(s)
| | - Okechukwu C. Okafor
- Department of Morbid Anatomy, University
of Nigeria Teaching Hospital, Ituku-Ozalla, Enugu State, Nigeria
| | - Emmanuel R. Ezeome
- Department of Surgery, University of
Nigeria Teaching Hospital, Ituku-Ozalla, Enugu State, Nigeria
| | - Chrisogonus E. Uche
- Department of Surgery, Imo State
University Teaching Hospital, Orlu, Imo state, Nigeria
| | - Charles Ememonu
- Department of Surgery, Imo State
University Teaching Hospital, Orlu, Imo state, Nigeria
| | - Emeka Kesieme
- Department of Surgery, Imo State
University Teaching Hospital, Orlu, Imo state, Nigeria
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28
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Pata G, Nascimbeni R, Di Lorenzo D, Gervasi M, Villanacci V, Salerni B. Hereditary multiple exostoses and juvenile colon carcinoma: A case with a common genetic background? J Surg Oncol 2009; 100:520-2. [PMID: 19653241 DOI: 10.1002/jso.21365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A case of obstructing colon cancer is described in a 31-year-old patient affected by hereditary multiple exostoses. The association of these two rare conditions, which has never been described previously, and their early onset prompt us to discuss the clinical and genetic elements of a potential common pathogenic scenario.
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Affiliation(s)
- Giacomo Pata
- Department of Medical & Surgical Sciences, 1st Division of General Surgery, University of Brescia, 25124 Brescia, Italy.
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29
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Half E, Bercovich D, Rozen P. Familial adenomatous polyposis. Orphanet J Rare Dis 2009; 4:22. [PMID: 19822006 PMCID: PMC2772987 DOI: 10.1186/1750-1172-4-22] [Citation(s) in RCA: 336] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2009] [Accepted: 10/12/2009] [Indexed: 02/06/2023] Open
Abstract
Familial adenomatous polyposis (FAP) is characterized by the development of many tens to thousands of adenomas in the rectum and colon during the second decade of life. FAP has an incidence at birth of about 1/8,300, it manifests equally in both sexes, and accounts for less than 1% of colorectal cancer (CRC) cases. In the European Union, prevalence has been estimated at 1/11,300-37,600. Most patients are asymptomatic for years until the adenomas are large and numerous, and cause rectal bleeding or even anemia, or cancer develops. Generally, cancers start to develop a decade after the appearance of the polyps. Nonspecific symptoms may include constipation or diarrhea, abdominal pain, palpable abdominal masses and weight loss. FAP may present with some extraintestinal manifestations such as osteomas, dental abnormalities (unerupted teeth, congenital absence of one or more teeth, supernumerary teeth, dentigerous cysts and odontomas), congenital hypertrophy of the retinal pigment epithelium (CHRPE), desmoid tumors, and extracolonic cancers (thyroid, liver, bile ducts and central nervous system). A less aggressive variant of FAP, attenuated FAP (AFAP), is characterized by fewer colorectal adenomatous polyps (usually 10 to 100), later age of adenoma appearance and a lower cancer risk. Some lesions (skull and mandible osteomas, dental abnormalities, and fibromas on the scalp, shoulders, arms and back) are indicative of the Gardner variant of FAP. Classic FAP is inherited in an autosomal dominant manner and results from a germline mutation in the adenomatous polyposis (APC) gene. Most patients (~70%) have a family history of colorectal polyps and cancer. In a subset of individuals, a MUTYH mutation causes a recessively inherited polyposis condition, MUTYH-associated polyposis (MAP), which is characterized by a slightly increased risk of developing CRC and polyps/adenomas in both the upper and lower gastrointestinal tract. Diagnosis is based on a suggestive family history, clinical findings, and large bowel endoscopy or full colonoscopy. Whenever possible, the clinical diagnosis should be confirmed by genetic testing. When the APC mutation in the family has been identified, genetic testing of all first-degree relatives should be performed. Presymptomatic and prenatal (amniocentesis and chorionic villous sampling), and even preimplantation genetic testing is possible. Referral to a geneticist or genetic counselor is mandatory. Differential diagnoses include other disorders causing multiple polyps (such as Peutz-Jeghers syndrome, familial juvenile polyps or hyperplastic polyposis, hereditary mixed polyposis syndromes, and Lynch syndrome). Cancer prevention and maintaining a good quality of life are the main goals of management and regular and systematic follow-up and supportive care should be offered to all patients. By the late teens or early twenties, colorectal cancer prophylactic surgery is advocated. The recommended alternatives are total proctocolectomy and ileoanal pouch or ileorectal anastomosis for AFAP. Duodenal cancer and desmoids are the two main causes of mortality after total colectomy, they need to be identified early and treated. Upper endoscopy is necessary for surveillance to reduce the risk of ampullary and duodenal cancer. Patients with progressive tumors and unresectable disease may respond or stabilize with a combination of cytotoxic chemotherapy and surgery (when possible to perform). Adjunctive therapy with celecoxib has been approved by the US Food and Drug Administration and the European Medicines Agency in patients with FAP. Individuals with FAP carry a 100% risk of CRC; however, this risk is reduced significantly when patients enter a screening-treatment program.
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Affiliation(s)
- Elizabeth Half
- Familial Cancer Clinic, Gastroenterology Dept, Meir Hospital, Kfar Saba, Israel.
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30
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Filipe B, Albuquerque C, Bik E, Lage P, Rodrigues P, Vossen R, Tops C, Nobre Leitão C. APC somatic mosaicism in a patient with Gardner syndrome carrying the E1573X mutation: report of a case. Dis Colon Rectum 2009; 52:1516-20; discussion 1520-1. [PMID: 19617769 DOI: 10.1007/dcr.0b013e3181ab810f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
We report a case of somatic APC mosaicism in an person with a clinical diagnosis of Gardner syndrome with features of attenuated polyposis coli and with an uninformative family history. In initial screening for APC mutations, the germline mutation E1573X was detected in a lower proportion than that predicted by a heterozygous mutation indicating the presence of somatic mosaicism. Pyrosequencing confirmed this hypothesis and quantified the presence of the mutation in approximately 18% of the blood lymphocytes. Mutational analysis performed in the offspring revealed a fully heterozygous E1573X mutation in 2 of the 3 individuals tested. The milder colonic phenotype exhibited by the index patient could be a consequence of the presence of the mosaicism in the colon mucosa. The detection of the mutation in other tissues and in the offspring suggests that it may have occurred early during embryogenesis, before the separation of the embryonic layers. The E1573X mutation is the most distal mutation in the APC sequence reported to date as a mosaic and, interestingly, in the context of Gardner syndrome with extensive extracolonic features. Mosaicism is an important consequence of de novo APC mutations and it should be considered in the management of apparently sporadic or de novo cases, particularly in the evaluation of the risk of siblings and offspring.
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Affiliation(s)
- Bruno Filipe
- Centro de Investigação de Patobiologia Molecular, Instituto Português de Oncologia de Lisboa de Francisco Gentil, EPE, Lisbon, Portugal
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Abstract
Familial adenomatous polyposis (FAP) is an autosomal dominant form of intestinal polyposis and colorectal cancer caused by germ-line mutations in the adenomatous polyposis coli (APC) gene. The term Gardner's syndrome is used to describe extracolonic manifestations, such as osteomas, skin cysts, congenital hypertrophy of the retinal pigmented epithelium (CHRPE), and desmoid tumours (aggressive fibromatosis), that are especially prominent in families with FAP. We postulate that a ciliary dysfunction is the underlying pathogenetic mechanism of extraintestinal manifestations in patients with FAP. This postulation is based on the presence of common clinical manifestations (ie, cysts, retinal abnormalities, and fibrosis) in Gardner's syndrome and cilia-related disorders. Additionally, both APC and the cilia have degradation of beta-catenin as the common downstream target in the Wnt-signalling pathway. Mutations in APC causing Gardner's syndrome are clustered in a region encoding a series of amino-acid repeats responsible for the binding to beta-catenin. Proofs of principle that beta-catenin could be the key mediator of the ciliary disorder also rely in the findings that overexpression of beta-catenin induces polycystic kidney disease, and CHRPE phenotypes in animal models. Other candidates for the common link between Gardner's syndrome and cilia-related disorders are the APC-binding proteins: end-binding protein 1 (EB1) and kinesin-family-member 3a (KIF3a), both of which are ciliary proteins involved in intraflagellar transport. Finally, pathogenetic similarities between some ciliopathies and extraintestinal tumours in FAP suggest a cilia defect. Understanding extracolonic manifestations in the context of FAP as a ciliary disorder might add new therapeutic options for patients with Gardner's syndrome.
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Quand le diagnostic d’une tumeur annexielle peut sauver la vie du patient…. Ann Dermatol Venereol 2009; 136:125-32. [DOI: 10.1016/j.annder.2008.11.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Pedace L, Majore S, Megiorni F, Binni F, De Bernardo C, Antigoni I, Preziosi N, Mazzilli MC, Grammatico P. Identification of a novel duplication in the APC gene using multiple ligation probe amplification in a patient with familial adenomatous polyposis. ACTA ACUST UNITED AC 2008; 182:130-5. [PMID: 18406876 DOI: 10.1016/j.cancergencyto.2008.01.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2007] [Revised: 01/11/2008] [Accepted: 01/24/2008] [Indexed: 12/14/2022]
Abstract
Germline mutations in the adenomatous polyposis coli (APC) gene cause familial adenomatous polyposis (FAP), an autosomal dominant disease characterized by hundreds to thousands of adenomatous polyps in the colon and rectum, with progression to colorectal cancer. The majority of APC mutations are nucleotide substitutions and frameshift mutations that result in truncated proteins. Recently, large genomic alterations of the APC gene have been reported in FAP. DNA from 15 FAP patients, in whom no APC germline mutations were detected with denaturing high performance liquid chromatography, was analyzed with multiplex ligation-dependent probe amplification (MLPA) to evaluate gross genomic alterations in the APC gene. In one case, MLPA identified a novel duplication of exons 2-6 in one copy of the APC gene. Reverse transcriptase-polymerase chain reaction revealed that the mutant allele contained an in-frame multiexon duplication including 18 nucleotides located in exon 2, upstream of the ATG initiation codon. The presence of a premature stop codon in the duplicated sequence leads to the synthesis of a truncated APC polypeptide. These findings highlight the utility of evaluating infrequent APC mutation events in FAP patients using MLPA.
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Affiliation(s)
- Lucia Pedace
- Medical Genetics, Experimental Medicine Department, University of Rome La Sapienza, S. Camillo-Forlanini Hospital, Circ. ne Gianicolense n. 87, 00152 Rome, Italy
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Kanter-Smoler G, Fritzell K, Rohlin A, Engwall Y, Hallberg B, Bergman A, Meuller J, Grönberg H, Karlsson P, Björk J, Nordling M. Clinical characterization and the mutation spectrum in Swedish adenomatous polyposis families. BMC Med 2008; 6:10. [PMID: 18433509 PMCID: PMC2386495 DOI: 10.1186/1741-7015-6-10] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2008] [Accepted: 04/24/2008] [Indexed: 01/24/2023] Open
Abstract
BACKGROUND The dominantly inherited condition familial adenomatous polyposis (FAP) is caused by germline mutations in the APC gene. Finding the causative mutations has great implications for the families. Correlating the genotypes to the phenotypes could help to improve the diagnosis and follow-up of patients. METHODS Mutation screening of APC and the clinical characterization of 96 unrelated FAP patients from the Swedish Polyposis Registry was performed. In addition to generally used mutation screening methods, analyses of splicing-affecting mutations and investigations of the presence of low-frequency mutation alleles, indicating mosaics, have been performed, as well as quantitative real-time polymerase chain reaction to detect lowered expression of APC. RESULTS Sixty-one different APC mutations in 81 of the 96 families were identified and 27 of those are novel. We have previously shown that 6 of the 96 patients carried biallelic MUTYH mutations. The 9 mutation-negative cases all display an attenuated or atypical phenotype. Probands with a genotype (codon 1250-1464) predicting a severe phenotype had a median age at diagnosis of 21.8 (range, 11-49) years compared with 34.4 (range, 14-57) years among those with mutations outside this region (P < 0.017). Dense polyposis (> 1000) occurred in 75% of the probands with a severe phenotype compared with 30% in those with mutations outside this region. The morbidity in colorectal cancer among probands was 25% at a mean age of 37.5 years and 29% at a mean age of 46.6 years. CONCLUSION Using a variety of mutation-detection techniques, we have achieved a 100% detection frequency in classical FAP. Probands with APC mutations outside codon 1250-1464, although exhibiting a less-severe phenotype, are at high risk of having a colorectal cancer at diagnosis indicating that age at diagnosis is as important as the severity of the disease for colorectal cancer morbidity.
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Affiliation(s)
- Gunilla Kanter-Smoler
- Department of Molecular and Clinical Genetics, Institute of Biomedicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
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Mutational screening of the APC gene in Chilean families with familial adenomatous polyposis: nine novel truncating mutations. Dis Colon Rectum 2007; 50:2142-8. [PMID: 17963004 DOI: 10.1007/s10350-007-9044-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
PURPOSE Familial adenomatous polyposis is characterized by the development of hundreds of adenomatous polyps located mainly in the colon and rectum. Patients with familial adenomatous polyposis who do not receive treatment will develop cancer before aged 40 years. This disease is caused by germline mutations in the adenomatous polyposis coli gene. Different studies have shown a correlation between the location of the mutation and the clinical phenotype, such as the grade of severity and/or the presence of extracolonic manifestations, such as desmoid tumors. This study was designed to identify germline mutation in the adenomatous polyposis coli gene in Chilean families with familial adenomatous polyposis. METHODS We examined the adenomatous polyposis coli gene in 24 Chilean families with familial adenomatous polyposis. The adenomatous polyposis coli gene was screened for mutations combining single strand conformation polymorphism technique, protein truncation test, and DNA sequencing. RESULTS We detected 17 different truncating mutations in 21 of 24 families (87.5 percent); 9 of these were novel. Fourteen mutations were detected in exon 15, being the most frequent c.3,927_3,931delAAAGA, found in 3 of 21 families (14 percent). Eight families (33 percent) showed at least one patient affected with desmoid tumors, presenting mutations between codons 849 and 1,533. Interestingly, two mutations, c.3,632dupA and c.3,783_3,784delTT, leading into a truncating protein at codons 1,216 and 1,274, were associated with almost 100 percent penetrance for desmoid tumors among relatives. CONCLUSIONS We achieved 87 percent mutation detection rate in adenomatous polyposis coli gene; more than 50 percent of them were novel. The high percentage of novel mutations found may be because of the genetic composition of the Chilean population, which is an admixture of Amerindian and Spaniards, and the scarce information in the literature about similar populations.
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Smud D, Augustin G, Kekez T, Kinda E, Majerovic M, Jelincic Z. Gardner's syndrome: Genetic testing and colonoscopy are indicated in adolescents and young adults with cranial osteomas: A case report. World J Gastroenterol 2007; 13:3900-3. [PMID: 17657852 PMCID: PMC4611230 DOI: 10.3748/wjg.v13.i28.3900] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
We present a case of a 25-year-old female with diagnosed familial adenomatous polyposis and elevated carcinoembryonic antigen with negative family history. The suspicion of Gardner's syndrome was raised because extirpation of an osteoma of the left temporo-occipital region was made 10 years ago. Restorative procto-colectomy and ileal pouch anal anastomosis was made but histology delineated adenocarcinoma of the rectum (Dukes C stage). We conclude that cranial osteomas often precede gastrointestinal manifestations of familial adenomatous polyposis or Gardner's syndrome and such patients should be evaluated with genetic testing followed by colonoscopy if results are positive to prevent the development of colorectal carcinoma. If the diagnosis is positive all family members should be evaluated for familial adenomatous polyposis.
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Affiliation(s)
- Dubravko Smud
- Clinical Hospital Center Zagreb, Department of Surgery, Division of Abdominal Surgery, Kispaticeva 12, Zagreb 10000, Croatia
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Cao X, Hong Y, Eu KW, Loi C, Cheah PY. Singapore familial adenomatous polyposis (FAP) patients with classical adenomatous polyposis but undetectable APC mutations have accelerated cancer progression. Am J Gastroenterol 2006; 101:2810-7. [PMID: 17026565 DOI: 10.1111/j.1572-0241.2006.00842.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
OBJECTIVES Germline mutation in adenomatous polyposis coli (APC) is detected in up to 80% of familial adenomatous polyposis (FAP) patients worldwide. In this study, we evaluated clinical features and APC mutations of Singapore FAP patients and contrasted genotype-phenotype correlation with Caucasians from other regions of the world and between FAP patients with and without detectable APC mutations. METHODS We screened 242 members from 57 unrelated FAP families using a combination of cDNA protein truncation test, multiplex ligation-dependent probe amplification, and differential expression techniques. RESULTS APC germline mutations were detected in 50 families. In contrast to Caucasians, fundic gland polyposis in Singapore patients was associated with APC mutations throughout the coding region and osteomas were also not confined to codon 767-1573. There was also no FAP-associated hepatoblastoma or medullablastoma. APC mutation-negative patients from four families with mixed (adenomatous/hyperplastic/atypical juvenile) polyps were subsequently reclassified as hereditary mixed polyposis syndrome (HMPS) patients. APC mutation-negative patients with classical adenomatous polyposis were negative for MYH, beta-catenin, and Axin 1 mutations. These patients had a significantly older age at diagnosis (P < 0.001) and more colorectal cancers (P= 0.017) than patients with APC mutations. CONCLUSIONS We achieved a 94% (50/53) APC mutation detection rate via a combination of techniques, suggesting that the current detection rate is probably not exhaustive. Singapore patients have some features similar to and other features distinct from Caucasians. Furthermore, APC mutation-negative patients have accelerated cancer progression that merits closer surveillance.
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Affiliation(s)
- Xia Cao
- Department of Colorectal Surgery, Singapore General Hospital, Singapore
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