1
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Miao H, Zhou Y, Ge S, Gu Y, Qu L, Zhou W, He H. A novel variant in the FLCN gene in a Chinese family with Birt-Hogg-Dubé syndrome. Mol Genet Genomic Med 2024; 12:e2488. [PMID: 38963008 PMCID: PMC11222970 DOI: 10.1002/mgg3.2488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 06/05/2024] [Accepted: 06/25/2024] [Indexed: 07/05/2024] Open
Abstract
BACKGROUND This study aimed to identify disease-causing variants within a Chinese family affected by Birt-Hogg-Dubé syndrome (BHDS), which arises from an autosomal dominant inheritance pattern attributed to variants in the folliculin (FLCN) gene, recognized as a tumor suppressor gene. METHODS A Chinese proband diagnosed with BHDS due to renal tumors underwent next-generation sequencing (NGS), revealing a novel variant in the FLCN gene. Sanger sequencing was subsequently performed on blood samples obtained from family members to confirm the presence of this variant. RESULTS A novel germline frameshift variant (NM_144997.5:c.977dup) was identified in five individuals among the screened family members, marking the first report of this variant. Additionally, a somatic frameshift variant (NM_144997.5:c.1252del) was detected in the renal tumors of the proband. No variant was detected in unaffected family members. CONCLUSIONS A novel heterozygous variant was identified in exon 9 of the FLCN gene, which broadens the spectrum of FLCN variants. We recommend that molecular analysis of the FLCN gene be performed in patients with suspected BHDS and their families.
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Affiliation(s)
- He Miao
- Department of Urology, Jinling Hospital, Jinling School of Clinical MedicineNanjing Medical UniversityNanjingJiangsuChina
| | - Yulin Zhou
- Department of Urology, Affiliated Jinling HospitalMedical School of Nanjing UniversityNanjingJiangsuChina
| | - Silun Ge
- Department of Urology, Jinling Hospital, Jinling School of Clinical MedicineNanjing Medical UniversityNanjingJiangsuChina
| | - Yufeng Gu
- Department of Urology, Affiliated Jinling HospitalMedical School of Nanjing UniversityNanjingJiangsuChina
| | - Le Qu
- Department of Urology, Affiliated Jinling HospitalMedical School of Nanjing UniversityNanjingJiangsuChina
| | - Wenquan Zhou
- Department of Urology, Jinling Hospital, Jinling School of Clinical MedicineNanjing Medical UniversityNanjingJiangsuChina
- Department of Urology, Affiliated Jinling HospitalMedical School of Nanjing UniversityNanjingJiangsuChina
| | - Haowei He
- Department of Urology, Affiliated Jinling HospitalMedical School of Nanjing UniversityNanjingJiangsuChina
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2
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Wu J, Lu J, Wu CL, Lu M. Birt-Hogg-Dubé syndrome in an overall view: Focus on the clinicopathological prospects in renal tumors. Semin Diagn Pathol 2024; 41:119-124. [PMID: 38242750 DOI: 10.1053/j.semdp.2024.01.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 01/04/2024] [Accepted: 01/04/2024] [Indexed: 01/21/2024]
Abstract
Birt-Hogg-Dubé syndrome (BHD) represents a rare autosomal dominant tumor predisposition syndrome characterized by skin lesions, lung cysts, and renal tumors. The predominant histological subtypes of BHD-related renal tumors include hybrid oncocytoma-chromophobe tumors, oncocytomas, and chromophobe renal cell carcinomas, all exhibiting eosinophilic/oncocytic features. Immunohistochemistry staining for KIT (CD117) and CK7 exhibits variability in these tumor types. Germline mutations in FLCN have been consistently identified. Generally, patients with BHD demonstrate a favorable prognosis with minimal metastatic potential. Nonetheless, the comprehensive elucidation of pathological characteristics of BHD remains incomplete, particularly in BHD-associated renal tumors that deviate from the previously identified subtypes, thereby complicating the differential diagnosis. In this review, we provide a comprehensive overview of BHD encompassing epidemiology, clinical manifestations, genetic and molecular pathogenesis, as well as clinical diagnostic modalities. Emphasis is placed on clinicopathological features, specifically focusing on BHD-associated renal tumors. Collectively, this review aims to present the latest insights into BHD which benefits in the early detection, therapeutic decision-making, and prognosis prediction in BHD cases, and deepen the understanding of sporadic renal tumors.
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Affiliation(s)
- Jialong Wu
- Department of Urology, Peking University Third Hospital, Beijing, China
| | - Jian Lu
- Department of Urology, Peking University Third Hospital, Beijing, China.
| | - Chin-Lee Wu
- Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Min Lu
- Department of Pathology, School of Basic Medical Sciences, Peking University Third Hospital, Peking University Health Science Center, Beijing, China.
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3
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Miao J, Gao Q, Wang Z, Hou G. Familial pulmonary cysts: A clue to diagnose Birt-Hogg-Dubé syndrome: A case report and literature review. Respirol Case Rep 2024; 12:e01319. [PMID: 38455502 PMCID: PMC10918712 DOI: 10.1002/rcr2.1319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2024] [Accepted: 02/26/2024] [Indexed: 03/09/2024] Open
Abstract
Birt-Hogg-Dubé syndrome (BHD) is an inherited autosomal dominant condition caused by germline mutations in the FLCN gene, mapped to chromosome 17p11.2. Typical manifestations include pulmonary cysts, spontaneous pneumothorax, fibrofolliculomas, and kidney neoplasms. This report details the case of a 56-year-old female non-smoker diagnosed with multiple pulmonary cysts, presenting with a history of recurrent spontaneous pneumothorax. A computed tomography (CT) scan of her daughter revealed similar pulmonary cysts, raising suspicion of BHD. Further abdominal enhanced CT revealed a left renal tumour and cutaneous fibrofolliculomas on her daughter's neck. Consequently, whole-exome sequencing confirmed an FLCN germline mutation in the patient and three relatives, establishing a diagnosis of BHD. This case highlights the importance of familial pulmonary cysts as a clue for diagnosing BHD, providing crucial insights into comparable clinical presentations.
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Affiliation(s)
- Jinrui Miao
- Department of Pulmonary and Critical Care MedicineThe Second Affiliated Hospital of Harbin Medical University, Harbin Medical UniversityHarbinChina
- National Center for Respiratory Medicine; State Key Laboratory of Respiratory Health and Multimorbidity; National Clinical Research Center for Respiratory Diseases; Institute of Respiratory Medicine, Chinese Academy of Medical Sciences; Department of Pulmonary and Critical Care Medicine, Center of Respiratory MedicineChina‐Japan Friendship HospitalBeijingChina
| | - Qian Gao
- National Center for Respiratory Medicine; State Key Laboratory of Respiratory Health and Multimorbidity; National Clinical Research Center for Respiratory Diseases; Institute of Respiratory Medicine, Chinese Academy of Medical Sciences; Department of Pulmonary and Critical Care Medicine, Center of Respiratory MedicineChina‐Japan Friendship HospitalBeijingChina
| | - Zilin Wang
- National Center for Respiratory Medicine; State Key Laboratory of Respiratory Health and Multimorbidity; National Clinical Research Center for Respiratory Diseases; Institute of Respiratory Medicine, Chinese Academy of Medical Sciences; Department of Pulmonary and Critical Care Medicine, Center of Respiratory MedicineChina‐Japan Friendship HospitalBeijingChina
| | - Gang Hou
- National Center for Respiratory Medicine; State Key Laboratory of Respiratory Health and Multimorbidity; National Clinical Research Center for Respiratory Diseases; Institute of Respiratory Medicine, Chinese Academy of Medical Sciences; Department of Pulmonary and Critical Care Medicine, Center of Respiratory MedicineChina‐Japan Friendship HospitalBeijingChina
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4
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Lin Y, Guo T, Lei C, Yang B, Yang D, Luo H, Peng H. Coexistent Sjogren's syndrome and Birt-Hogg-Dube´ syndrome: a case report. BMC Pulm Med 2023; 23:460. [PMID: 37993820 PMCID: PMC10664354 DOI: 10.1186/s12890-023-02680-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 09/26/2023] [Indexed: 11/24/2023] Open
Abstract
We report a rare case of Sjogren's syndrome complicated with Birt-Hogg-Dubé syndrome (BHDS) not previously mentioned in the literature. Further, there is insufficient evidence linking the two diseases. Here, we review existing diagnostic algorithms for diagnosing diffuse cystic lung disease and provide new insights. The patient initially complained of thirst and dry eyes for ten years, and gradually developed shortness of breath. After admission, physical examination showed five missing teeth, decreased respiratory sounds in both lower lungs, and Velcro rales. Computed tomography showed multiple thin-walled cystic lesions in both lungs. Initial xerophthalmia and labial gland biopsy seemed to reveal a pulmonary cystic change associated with Sjogren's syndrome. Before discharge, a rash suspected to indicate a fibrofollicular tumor in the neck was observed, and then FLCN variant has been found. The challenges how to clarify the diagnosis of DCLD causes are discussed.
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Affiliation(s)
- Yongkang Lin
- Department of Pulmonary and Critical Care Medicine, the Second Xiangya Hospital, Central South University, 139 Renmin Middle Road, Furong District, Changsha, Hunan, 410011, China
- Research Unit of Respiratory Disease, Central South University, Changsha, Hunan, 410011, China
- Hunan Diagnosis and Treatment Center of Respiratory Disease, Changsha, Hunan, 410011, China
| | - Ting Guo
- Department of Pulmonary and Critical Care Medicine, the Second Xiangya Hospital, Central South University, 139 Renmin Middle Road, Furong District, Changsha, Hunan, 410011, China
- Research Unit of Respiratory Disease, Central South University, Changsha, Hunan, 410011, China
- Hunan Diagnosis and Treatment Center of Respiratory Disease, Changsha, Hunan, 410011, China
| | - Cheng Lei
- Department of Pulmonary and Critical Care Medicine, the Second Xiangya Hospital, Central South University, 139 Renmin Middle Road, Furong District, Changsha, Hunan, 410011, China
- Research Unit of Respiratory Disease, Central South University, Changsha, Hunan, 410011, China
- Hunan Diagnosis and Treatment Center of Respiratory Disease, Changsha, Hunan, 410011, China
| | - Binyi Yang
- Department of Pulmonary and Critical Care Medicine, the Second Xiangya Hospital, Central South University, 139 Renmin Middle Road, Furong District, Changsha, Hunan, 410011, China
- Research Unit of Respiratory Disease, Central South University, Changsha, Hunan, 410011, China
- Hunan Diagnosis and Treatment Center of Respiratory Disease, Changsha, Hunan, 410011, China
| | - Danhui Yang
- Department of Pulmonary and Critical Care Medicine, the Second Xiangya Hospital, Central South University, 139 Renmin Middle Road, Furong District, Changsha, Hunan, 410011, China
- Research Unit of Respiratory Disease, Central South University, Changsha, Hunan, 410011, China
- Hunan Diagnosis and Treatment Center of Respiratory Disease, Changsha, Hunan, 410011, China
| | - Hong Luo
- Department of Pulmonary and Critical Care Medicine, the Second Xiangya Hospital, Central South University, 139 Renmin Middle Road, Furong District, Changsha, Hunan, 410011, China.
- Research Unit of Respiratory Disease, Central South University, Changsha, Hunan, 410011, China.
- Hunan Diagnosis and Treatment Center of Respiratory Disease, Changsha, Hunan, 410011, China.
| | - Hong Peng
- Department of Pulmonary and Critical Care Medicine, the Second Xiangya Hospital, Central South University, 139 Renmin Middle Road, Furong District, Changsha, Hunan, 410011, China.
- Research Unit of Respiratory Disease, Central South University, Changsha, Hunan, 410011, China.
- Hunan Diagnosis and Treatment Center of Respiratory Disease, Changsha, Hunan, 410011, China.
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Koh C, Wong M, Tay SB. Renal Cell Tumor and Cystic Lung Disease: A Genetic Link for Generalists to Be Aware of. Cureus 2023; 15:e43572. [PMID: 37719632 PMCID: PMC10503401 DOI: 10.7759/cureus.43572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/16/2023] [Indexed: 09/19/2023] Open
Abstract
Birt-Hogg-Dubé syndrome (BHDS) is a rare autosomal dominant condition characterized by multiple pulmonary cysts, fibrofolliculomas, and renal cell carcinoma. The typical presentations leading to diagnosis include fibrofolliculomas and spontaneous pneumothoraxes. We present a case of a 52-year-old Chinese male who was diagnosed with BHDS after the incidental pickup of an echogenic heterogenous lesion on an abdominal ultrasound done to investigate an abnormal liver function test. The presence of renal cell carcinoma with cystic pulmonary disease should prompt the clinician to consider the diagnosis of BHDS. Knowledge of extrapulmonary findings of common cystic lung diseases may contribute to improved diagnosis of this condition.
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Affiliation(s)
- Cedric Koh
- Department of Internal Medicine, Sengkang General Hospital, Singapore, SGP
| | - Marc Wong
- Department of Internal Medicine, Sengkang General Hospital, Singapore, SGP
| | - Sok Boon Tay
- Department of Respiratory Medicine, Sengkang General Hospital, Singapore, SGP
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6
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Namba Y, Ebana H, Okamoto S, Kobayashi E, Kurihara M, Sekimoto Y, Tsuboshima K, Okura MK, Mitsuishi Y, Takahashi K, Seyama K. Clinical and genetic features of 334 Asian patients with Birt-Hogg-Dubé syndrome (BHDS) who presented with pulmonary cysts with or without a history of pneumothorax, with special reference to BHDS-associated pneumothorax. PLoS One 2023; 18:e0289175. [PMID: 37490463 PMCID: PMC10368292 DOI: 10.1371/journal.pone.0289175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 07/12/2023] [Indexed: 07/27/2023] Open
Abstract
BACKGROUND The clinical pulmonary manifestations and genetic features of Birt-Hogg-Dubé syndrome (BHDS) in Asian patients remained unclear. We aimed to clarify the clinical features of BHDS-associated pneumothorax (PTX) and retrospectively investigate potential contributing factors in the largest Asian cohort to date. METHODS We reviewed the clinical and genetic data collected in 2006-2017, from the BHDS patients who were Asian and presented with pulmonary cysts with or without a history of PTX. RESULTS Data from 334 (41.3% males; 58.7% females) patients from 297 unrelated families were reviewed. Among them, 314 (94.0%) patients developed PTX. The median age at the first occurrence of PTX was 32 years, which was significantly lower in males (P = 0.003) and patients without notable skin manifestations (P < 0.001). Seventy-six (24.2%) patients experienced their first PTX episode before the age of 25 years. PTX simultaneously occurred in the bilateral lungs of 37 (11.8%) patients. Among 149 patients who had their first PTX episode at least 10 years before BHDS diagnosis, PTX occurred more frequently in males (P = 0.030) and light smokers than in nonsmokers (P = 0.014). The occurrence of PTX peaked in the early 30s and gradually decreased with age but remained high in females (P = 0.001). We identified 70 unique FLCN germline variants, including duplications (46.4%), substitutions (7.1%), insertions/deletions (30.0%), and variants affecting splicing (12.5%). Approximately 80% of Asian patients suspected of having BHDS could be genetically diagnosed by examining FLCN exons 7, 9, 11, 12, and 13. No apparent genotype-phenotype correlation regarding pulmonary manifestations was identified. CONCLUSIONS Our findings indicate that sex, smoking history, and skin manifestations at BHDS diagnosis significantly influence the clinical features of BHDS-associated PTX. These findings may contribute to the appropriate management and treatment of BHDS-associated PTX.
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Affiliation(s)
- Yukiko Namba
- Division of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Hiroki Ebana
- Division of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
- The Study Group of Pneumothorax and Cystic Lung Diseases, Tokyo, Japan
| | - Shouichi Okamoto
- Division of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
- The Study Group of Pneumothorax and Cystic Lung Diseases, Tokyo, Japan
| | - Etsuko Kobayashi
- Division of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
- The Study Group of Pneumothorax and Cystic Lung Diseases, Tokyo, Japan
| | - Masatoshi Kurihara
- The Study Group of Pneumothorax and Cystic Lung Diseases, Tokyo, Japan
- Pneumothorax Research Center, Nissan Tamagawa Hospital, Tokyo, Japan
| | - Yasuhito Sekimoto
- Division of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
- The Study Group of Pneumothorax and Cystic Lung Diseases, Tokyo, Japan
| | - Kenji Tsuboshima
- The Study Group of Pneumothorax and Cystic Lung Diseases, Tokyo, Japan
- Pneumothorax Research Center, Nissan Tamagawa Hospital, Tokyo, Japan
| | - Makiko Kunogi Okura
- Division of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
- The Study Group of Pneumothorax and Cystic Lung Diseases, Tokyo, Japan
| | - Yoichiro Mitsuishi
- Division of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Kazuhisa Takahashi
- Division of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | - Kuniaki Seyama
- Division of Respiratory Medicine, Juntendo University Graduate School of Medicine, Tokyo, Japan
- The Study Group of Pneumothorax and Cystic Lung Diseases, Tokyo, Japan
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7
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Wang Y, Cai M, Jiang X, Lv G, Hu D, Zhang G, Liu J, Wei W, Xiao J, Shen B, Ryu JH, Hu X. Exons 1-3 deletion in FLCN is associated with increased risk of pneumothorax in Chinese patients with Birt-Hogg-Dubé syndrome. Orphanet J Rare Dis 2023; 18:115. [PMID: 37170274 PMCID: PMC10176890 DOI: 10.1186/s13023-023-02710-9] [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: 12/08/2022] [Accepted: 04/30/2023] [Indexed: 05/13/2023] Open
Abstract
BACKGROUND The pathogenic variants responsible for Birt-Hogg-Dubé syndrome (BHDS) in folliculin (FLCN) gene mostly consist of point mutations. Although large intragenic deletions/duplications have been reported in several case reports, the relationship between large intragenic deletions/duplications and phenotype in BHDS remains unclear. METHODS We retrospectively identified and reviewed patients with a large intragenic deletion spanning exons 1-3 and analyzed their phenotypic features to compare with those of point mutation carriers in our hospital from January 1, 2017 to August 31, 2022. RESULTS Twenty unique point mutations (including 4 novel mutations) were detected in 62 patients from 45 families (90%). Exons 1-3 deletion were identified in 8 patients from 5 families (10%) that resided in the same region, Feidong County of Anhui Province, China. Breakpoint analysis indicated that all the deletion breakpoints were flanked by Alu repeats. The prevalence of exons 1-3 deletion carriers in Feidong County was 8.1-times higher than that for BHDS in Anhui Province, suggesting a clustered phenomenon of exons 1-3 deletion. Significantly increased risk of pneumothorax was observed in those with exons 1-3 deletion compared with point mutations (91% vs. 58%, p value 0.047). The risk of renal cancer may be higher in those with exons 1-3 deletion than for those with point mutations (18% vs. 4%, p > 0.05). CONCLUSIONS Large intragenic deletion of exons 1-3 in FLCN was identified as a local aggregation phenomenon in Feidong County, China, and was associated with a significantly higher risk of pneumothorax compared to those with point mutations.
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Affiliation(s)
- Yue Wang
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230001, Anhui, China
- BengBu Medical College, Bengbu, Anhui, China
| | - Mengru Cai
- Jiangsu Key Laboratory of Molecular Medicine, Medical School, Nanjing University, Nanjing, 210093, Jiangsu, China
| | - Xianliang Jiang
- Department of Thoracic Surgery, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China
| | - Guangyu Lv
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230001, Anhui, China
| | - Daiju Hu
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230001, Anhui, China
| | - Guofeng Zhang
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230001, Anhui, China
| | - Jinli Liu
- Department of Dermatology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China
| | - Wei Wei
- Department of Radiology, The First Affiliated Hospital of USTC, University of Science and Technology of China, Hefei, Anhui, China
| | - Jun Xiao
- Department of Urology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China
| | - Bing Shen
- School of Basic Medicine, Anhui Medical University, Hefei, Anhui, China
| | - Jay H Ryu
- Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN, USA
| | - Xiaowen Hu
- Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230001, Anhui, China.
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8
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Tang S, Wei C, Wang X, Xiao M, Luo F, Chen L. Birt-Hogg-Dubé syndrome with c.1579_1580insA variant in a Chinese family: a case report. Front Med (Lausanne) 2023; 10:1184854. [PMID: 37206475 PMCID: PMC10188955 DOI: 10.3389/fmed.2023.1184854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2023] [Accepted: 04/11/2023] [Indexed: 05/21/2023] Open
Abstract
Birt-Hogg-Dubé (BHD) syndrome, is a rare genetic disease with heterogeneous manifestations in different populations. In this study, we reported a Chinese female BHD case and her family members with c.1579_1580insA variant in FLCN gene, who were characterized by diffused pulmonary cysts/bulla, and reviewed another five familial BHD cases in China. Based on these cases, recurrent spontaneous pneumothorax is likely to be the first symptom for BHD in Chinese patients, with particularly but not limited to c.1579_1580insA variant. Therefore, attention to the early diagnosis of BHD in China should focus on pulmonary signs, but skin or kidney lesions still can not be neglected.
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Affiliation(s)
- Shijie Tang
- Department of Pulmonary and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Chuanqi Wei
- Department of Pulmonary and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Xiaoyu Wang
- Department of Otolaryngology-Head and Neck Surgery, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Min Xiao
- Department of Pulmonary and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Fengming Luo
- Department of Pulmonary and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China
- Fengming Luo,
| | - Lei Chen
- Department of Pulmonary and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China
- *Correspondence: Lei Chen,
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9
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Abstract
Birt-Hogg-Dubé syndrome is an uncommon autosomal dominant systemic disorder with cutaneous findings notable for fibrofolliculomas or trichodiscomas on the scalp, face, neck, and trunk. These cutaneous signs are associated with bilateral renal cell carcinoma, benign renal cysts, pulmonary cysts, and spontaneous pneumothorax. Given its autosomal dominant inheritance pattern, the successful diagnosis of Birt-Hogg-Dubé syndrome (BHDS) may elucidate a diagnosis in family members. BHDS results from a mutation in the FLCN gene encoding the folliculin protein, a transcriptional regulator of the mammalian target of rapamycin signaling pathway. Like tuberous sclerosis, BHDS's clinical features may subside with the use of oral rapamycin for mammalian target of rapamycin inhibition, a theoretical concept meriting exploration. Although its prevalence in the general population has been estimated at 2 cases per million, BHDS has been detected in a few patients from the nearby Portuguese-lineage quarter of the city of Newark, a disproportionate prevalence possibly explained by the founder effect.
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Affiliation(s)
- Rohan R Shah
- Departments of Pathology and Dermatology, Rutgers-New Jersey Medical School, Newark, New Jersey, USA
| | - William Clark Lambert
- Departments of Pathology and Dermatology, Rutgers-New Jersey Medical School, Newark, New Jersey, USA.
| | - Robert A Schwartz
- Departments of Pathology and Dermatology, Rutgers-New Jersey Medical School, Newark, New Jersey, USA
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10
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Birt-Hogg-Dubé syndrome encountered at rare lung disease clinic in Anhui province, China. Orphanet J Rare Dis 2022; 17:203. [PMID: 35578266 PMCID: PMC9112470 DOI: 10.1186/s13023-022-02362-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Accepted: 05/08/2022] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Diagnosis of rare diseases remains a challenge in China. We describe our experience with Birt-Hogg-Dubé syndrome (BHDS) encountered at a Rare Lung Disease Clinic recently established in China.
Methods
After the first patient with BHDS was recognized in 2017, a Rare Lung Disease Clinic with a multidisciplinary team of specialists was established. We retrospectively analyzed the data of consecutive patients with BHDS encountered from inception to December 2021.
Results
There were 1, 1, 15, 12 and 21 cases with BHDS diagnosed from year 2017 to 2021, respectively. All 50 patients (34 women) were of Han race with a mean age of 47.4 years. The common manifestations were pulmonary cysts (98%), pneumothorax (54%) and skin lesions (68%). Renal cancer was detected in two patients and renal angiomyolipoma in four other patients. The main presentations leading to diagnosis were pneumothorax (42%), family screening (36%), and lung cysts identified on radiologic imaging (20%). The average delay in diagnosis was 8.3 years, and 4.7 years in patients with only pulmonary cysts. The most frequent pathogenic variant was c.1285del/dup on exon 11 (23%) among 44 patients confirmed by genetic testing. Renal cancer has not been found on follow-up surveillance thus far.
Conclusions
Increasing number of patients with BHDS are being recognized in China, facilitated by establishment of a Rare Lung Disease Clinic. Pulmonary cysts and pneumothorax were commonly encountered features, but skin lesions appeared to be more prevalent in Chinese subjects than previously reported in other Asian countries.
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11
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Zhou W, Liu K, Xu KF, Liu Y, Tian X. Clinical and Genetic Comparison of Birt–Hogg–Dubé Syndrome (Hornstein–Knickenberg Syndrome) in Chinese: A Systemic Review of Reported Cases. Int J Gen Med 2022; 15:5111-5121. [PMID: 35637701 PMCID: PMC9144823 DOI: 10.2147/ijgm.s359660] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Accepted: 05/16/2022] [Indexed: 12/27/2022] Open
Abstract
Background Birt–Hogg–Dubé syndrome (BHD), also named Hornstein–Knickenberg syndrome, is a rare autosomal dominant disease characterized by lung cysts, recurrent pneumothoraxes, renal cell carcinoma and skin fibrofolliculomas. Purpose This study summarizes the clinical and genetic information of Chinese BHD patients from all available reported cases and explores the relationship between the clinical and genetic spectrum in the hope of improving the prognosis of Chinese BHD patients. Methods Relative studies were collected by searching PubMed, Cochrane Library, Embase, OVID medicine, SinoMed, Web of Science, China National Knowledge Infrastructure, Wanfang Data and China Hospital Knowledge Database from January 1, 1977 to December 31, 2021. The search strategy included the following term keys: (Birt–Hogg–Dubé syndrome OR Hornstein-Kinckenberg syndrome OR familial pulmonary cysts OR familial spontaneous pneumothorax OR fibrofolliculomas OR trichodiscomas OR inherited renal cancer syndromes OR FLCN) AND (Chinese OR China). Results In total, 287 Chinese patients from 143 families described in 31 references were included in this article. Chinese BHD patients tended to present more pulmonary symptoms but fewer skin lesions and renal malignancies, which appeared to be atypical when compared with Caucasian patients. The FLCN mutation spectrum among Chinese BHD patients was established with the mutational hot spot c.1285depC/delC as the most frequent mutation. In addition, this mutation spectrum also showed some differences from other races, with a relatively frequent large deletion c.872–429_1740+1763del (exon 9–14 deletion) reported only in Chinese individuals but no observation of the two mutational hot spots found in Japanese individuals. We also attempted to establish potential pheno-genotype correlations in Chinese BHD patients, but the results were negative. Conclusion To improve the prognosis of BHD patients, physicians need to increase their awareness of BHD by focusing on the family history of pneumothorax as well as skin lesions in patients with lung cysts and promptly advising patients on genetic sequencing.
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Affiliation(s)
- Wangji Zhou
- Department of Pulmonary and Critical Care Medicine, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, People’s Republic of China
| | - Keqiang Liu
- Xinhua Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, People’s Republic of China
- Shanghai Institute of Pediatric Research, Shanghai, People’s Republic of China
| | - Kai-Feng Xu
- Department of Pulmonary and Critical Care Medicine, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, People’s Republic of China
| | - Yaping Liu
- McKusick-Zhang Center for Genetic Medicine, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, People’s Republic of China
- Yaping Liu, McKusick-Zhang Center for Genetic Medicine, State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100005, People’s Republic of China, Email
| | - Xinlun Tian
- Department of Pulmonary and Critical Care Medicine, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, People’s Republic of China
- Correspondence: Xinlun Tian, Department of Pulmonary and Critical Care Medicine, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, #1 Shuaifuyuan, Wangfujing, Beijing, 100730, People’s Republic of China, Tel +86 13911204657, Email
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