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Oikawa K, Ohno SI, Ono K, Hirao K, Murakami A, Harada Y, Kumagai K, Sudo K, Takanashi M, Ishikawa A, Mineo S, Fujita K, Umezu T, Watanabe N, Murakami Y, Ogawa S, Schultz KA, Kuroda M. Liver-specific DICER1 syndrome model mice develop cystic liver tumors with defective primary cilia. J Pathol 2024. [PMID: 38922876 DOI: 10.1002/path.6320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 05/01/2024] [Accepted: 05/20/2024] [Indexed: 06/28/2024]
Abstract
DICER1 syndrome is a tumor predisposition syndrome caused by familial genetic mutations in DICER1. Pathogenic variants of DICER1 have been discovered in many rare cancers, including cystic liver tumors. However, the molecular mechanisms underlying liver lesions induced by these variants remain unclear. In the present study, we sought to gain a better understanding of the pathogenesis of these variants by generating a mouse model of liver-specific DICER1 syndrome. The mouse model developed bile duct hyperplasia with fibrosis, similar to congenital hepatic fibrosis, as well as cystic liver tumors resembling those in Caroli's syndrome, intrahepatic cholangiocarcinoma, and hepatocellular carcinoma. Interestingly, the mouse model of DICER1 syndrome showed abnormal formation of primary cilia in the bile duct epithelium, which is a known cause of bile duct hyperplasia and cyst formation. These results indicated that DICER1 mutations contribute to cystic liver tumors by inducing defective primary cilia. The mouse model generated in this study will be useful for elucidating the potential mechanisms of tumorigenesis induced by DICER1 variants and for obtaining a comprehensive understanding of DICER1 syndrome. © 2024 The Pathological Society of Great Britain and Ireland.
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Affiliation(s)
- Keiki Oikawa
- Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan
| | - Shin-Ichiro Ohno
- Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan
| | - Kana Ono
- Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan
| | - Kaito Hirao
- Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan
| | - Ayano Murakami
- Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan
| | - Yuichirou Harada
- Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan
| | - Katsuyoshi Kumagai
- Department of Pre-clinical Research Center, Tokyo Medical University, Tokyo, Japan
| | - Katsuko Sudo
- Department of Pre-clinical Research Center, Tokyo Medical University, Tokyo, Japan
| | | | - Akio Ishikawa
- Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan
| | - Shouichirou Mineo
- Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan
| | - Koji Fujita
- Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan
| | - Tomohiro Umezu
- Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan
| | - Noriko Watanabe
- Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan
| | - Yoshiki Murakami
- Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan
| | - Shinichiro Ogawa
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
| | - Kris Ann Schultz
- Cancer and Blood Disorders, Children's Minnesota, Minneapolis, MN, USA
| | - Masahiko Kuroda
- Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan
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Lee SH, Vadlamudi C, Zhao Q, Yilmaz O, Cerda S. An institutional experience with DICER1 mutated thyroid nodules-evaluating the cytomorphology and molecular phenotype. J Am Soc Cytopathol 2022; 11:335-344. [PMID: 35934646 DOI: 10.1016/j.jasc.2022.07.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 06/27/2022] [Accepted: 07/06/2022] [Indexed: 06/15/2023]
Abstract
INTRODUCTION DICER1 mutated thyroid nodules are commonly seen in pediatric populations often, as part of DICER1 syndrome. We seek to evaluate DICER1 mutated thyroid nodules in adult populations to assess whether there exists distinctive clinical, cytologic, histologic, and molecular characteristics that underline our institutional cohort. MATERIALS AND METHODS Retrospective analysis was performed on all fine-needle aspiration (FNA) specimens with a corresponding ThyroSeq panel, to select a cohort of cases with DICER1 mutations. Clinical, radiologic, and cytology materials were reviewed, and histology was reviewed for corresponding resection cases were available. ThyroSeq panel was further scrutinized for additional molecular alterations and variant allele frequency. RESULTS DICER1 mutated thyroid nodules (n = 8), more commonly occurred in younger adults (P = 0.01) with larger (P = 0.01) nodules and only in female patients in our cohort. FNA commonly demonstrates cellular specimens with banal cytomorphologic cues including regular nuclei, inconspicuous nucleoli, smooth nuclear membranes, and abundant colloid. On retrospective review by 2 cytopathologists, the lesions were frequently diagnosed as Bethesda II (5 of 8) by both reviewers. Histology, when available, showed that all nodules were categorized as follicular adenomas (5 of 5), often demonstrating macrofollicles with papillary excrescences demonstrating bland nuclei (4 of 5). DICER1 mutational profile revealed a variant allele frequency of >40% in 25% of cases (2 of 8) and >30% in an additional 4 cases, highlighting a possible germline association. CONCLUSIONS DICER1 mutated nodules may be under-reported due to banal cytomorphologic features and may be associated with an underlying germline alteration.
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Affiliation(s)
- Soo Hyun Lee
- Department of Pathology, Boston University Medical Center, Boston, Massachusetts
| | - Charitha Vadlamudi
- Department of Pathology, Boston University Medical Center, Boston, Massachusetts
| | - Qing Zhao
- Department of Pathology, Boston University Medical Center, Boston, Massachusetts
| | - Osman Yilmaz
- Department of Pathology, Boston University Medical Center, Boston, Massachusetts.
| | - Sandra Cerda
- Department of Pathology, Boston University Medical Center, Boston, Massachusetts.
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3
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McCluggage WG, Foulkes WD. Rare and unusual tumours associated with characteristic molecular events: the importance of specialist pathology review. Histopathology 2022; 81:310-311. [PMID: 35942576 DOI: 10.1111/his.14699] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 05/16/2022] [Accepted: 05/17/2022] [Indexed: 11/29/2022]
Affiliation(s)
- W Glenn McCluggage
- Department of Pathology, Belfast Health and Social Care Trust, Belfast, Northern Ireland, UK
| | - William D Foulkes
- Departments of Human Genetics, Medicine and Oncology, McGill University, Montréal, Québec, Canada
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