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https://www.readbyqxmd.com/read/29893999/folliculin-regulates-osteoclastogenesis-through-metabolic-regulation
#1
Masaya Baba, Mitsuhiro Endoh, Wenjuan Ma, Hirofumi Toyama, Akiyoshi Hirayama, Keizo Nishikawa, Keiyo Takubo, Hiroyuki Hano, Hisashi Hasumi, Terumasa Umemoto, Michihiro Hashimoto, Nobuko Irie, Chiharu Esumi, Miho Kataoka, Naomi Nakagata, Tomoyoshi Soga, Masahiro Yao, Tomomi Kamba, Takashi Minami, Masaru Ishii, Toshio Suda
Osteoclast differentiation is a dynamic differentiation process, which is accompanied by dramatic changes in metabolic status as well as in gene expression. Recent findings have revealed an essential connection between metabolic reprogramming and dynamic gene expression changes during osteoclast differentiation. However, the upstream regulatory mechanisms that drive these metabolic changes in osteoclastogenesis remain to be elucidated. Here we demonstrate that induced deletion of a tumor suppressor gene, Folliculin (Flcn), in mouse osteoclast precursors causes severe osteoporosis in 3 weeks through excess osteoclastogenesis...
June 12, 2018: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/29848618/gator1-dependent-recruitment-of-flcn-fnip-to-lysosomes-coordinates-rag-gtpase-heterodimer-nucleotide-status-in-response-to-amino-acids
#2
Jin Meng, Shawn M Ferguson
Folliculin (FLCN) is a tumor suppressor that coordinates cellular responses to changes in amino acid availability via regulation of the Rag guanosine triphosphatases. FLCN is recruited to lysosomes during amino acid starvation, where it interacts with RagA/B as a heterodimeric complex with FLCN-interacting proteins (FNIPs). The FLCN-FNIP heterodimer also has GTPase-activating protein (GAP) activity toward RagC/D. These properties raised two important questions. First, how is amino acid availability sensed to regulate lysosomal abundance of FLCN? Second, what is the relationship between FLCN lysosome localization, RagA/B interactions, and RagC/D GAP activity? In this study, we show that RagA/B nucleotide status determines the FLCN-FNIP1 recruitment to lysosomes...
May 30, 2018: Journal of Cell Biology
https://www.readbyqxmd.com/read/29774133/sporadic-renal-angiomyolipoma-in-a-patient-with-birt-hogg-dub%C3%A3-chaperones-in-pathogenesis
#3
Rebecca A Sager, Mark R Woodford, Oleg Shapiro, Mehdi Mollapour, Gennady Bratslavsky
Birt-Hogg-Dubé (BHD) is an autosomal dominant genetic syndrome caused by germline mutations in the FLCN gene that predisposes patients to develop renal tumors. Renal angiomyolipoma (AML) is not a renal tumor sub-type associated with BHD. AML is, however, a common phenotypic manifestation of Tuberous Sclerosis Complex (TSC) syndrome caused by mutations in either the TSC1 or TSC2 tumor suppressor genes. Previous case reports of renal AML in patients with BHD have speculated on the molecular and clinical overlap of these two syndromes as a result of described involvement of the gene products in the mTOR pathway...
April 24, 2018: Oncotarget
https://www.readbyqxmd.com/read/29767721/bhd-associated-kidney-cancer-exhibits-unique-molecular-characteristics-and-a-wide-variety-of-variants-in-chromatin-remodeling-genes
#4
Hisashi Hasumi, Mitsuko Furuya, Kenji Tatsuno, Shogo Yamamoto, Masaya Baba, Yukiko Hasumi, Yasuhiro Isono, Kae Suzuki, Ryosuke Jikuya, Shinji Otake, Kentaro Muraoka, Kimito Osaka, Narihiko Hayashi, Kazuhide Makiyama, Yasuhide Miyoshi, Keiichi Kondo, Noboru Nakaigawa, Takashi Kawahara, Koji Izumi, Junichi Teranishi, Yasushi Yumura, Hiroji Uemura, Yoji Nagashima, Adam R Metwalli, Laura S Schmidt, Hiroyuki Aburatani, W Marston Linehan, Masahiro Yao
Birt-Hogg-Dubé (BHD) syndrome is a hereditary kidney cancer syndrome, which predisposes patients to develop kidney cancer, cutaneous fibrofolliculomas and pulmonary cysts. The responsible gene FLCN is a tumor suppressor for kidney cancer which plays an important role in energy homeostasis through the regulation of mitochondrial oxidative metabolism. However, the process by which FLCN-deficiency leads to renal tumorigenesis is unclear. In order to clarify molecular pathogenesis of BHD-associated kidney cancer, we conducted whole-exome sequencing analysis using next-generation sequencing technology as well as metabolite analysis using LC/MS and GC/MS...
May 14, 2018: Human Molecular Genetics
https://www.readbyqxmd.com/read/29720200/splice-site-mutation-causing-partial-retention-of-intron-in-the-flcn-gene-in-birt-hogg-dub%C3%A3-syndrome-a-case-report
#5
Mitsuko Furuya, Hironori Kobayashi, Masaya Baba, Takaaki Ito, Reiko Tanaka, Yukio Nakatani
BACKGROUND: Birt-Hogg-Dubé syndrome (BHD) is an autosomal dominant disorder caused by germline mutations in the folliculin gene (FLCN). Nearly 150 pathogenic mutations have been identified in FLCN. The most frequent pattern is a frameshift mutation within a coding exon. In addition, splice-site mutations have been reported, and previous studies have confirmed exon skipping in several cases. However, it is poorly understood whether there are any splice-site mutations that cause translation of intron regions in FLCN...
May 2, 2018: BMC Medical Genomics
https://www.readbyqxmd.com/read/29684959/-a-case-of-chromophobe-renal-cell-carcinoma-associated-with-birt-hogg-dub%C3%A3-syndrome
#6
Yoichiro Tohi, Noriyuki Makita, Issei Suzuki, Ryosuke Suzuki, Arinobu Fukunaga, Masashi Kubota, Takashi Matsuoka, Yoshio Sugino, Koji Inoue, Keiichiro Uehara, Yukihiro Imai, Mutsushi Kawakita
A 61-year-old man with a left renal mass, which was detected by ultrasound during a routine health examination, was referred to our department. The patient had a surgical history of two pneumothorax operations, and the patient's brother also had a history of pneumothorax surgery. A case of Birt-Hogg-Dubé (BHD) syndrome was suspected based on patient history. The pathological diagnosis of the resected tumor, which used robot-assisted laparoscopic partial nephrectomy, was determined to be chromophobe renal cell carcinoma (grade 2, pT1a)...
March 2018: Hinyokika Kiyo. Acta Urologica Japonica
https://www.readbyqxmd.com/read/29548312/delayed-diagnosis-of-birt-hogg-dub%C3%A3-syndrome-due-to-marked-intrafamilial-clinical-variability-a-case-report
#7
E C Sattler, O K Steinlein
BACKGROUND: Birt-Hogg-Dubé syndrome is a genetic syndrome caused by mutations in the FLCN gene. The main symptoms are lung bullae and pneumothorax, benign and malignant kidney tumors, and facial fibrofolliculoma. The risk of pneumothorax is considerable between ages 20-40 years, but decreases markedly after this age range and first-time pneumothorax after age 50 years is rare. Fibrofolliculomas usually occur between ages 35 and 45 years, while the risk for kidney cancer increases steadily with age, starting in young adulthood...
March 16, 2018: BMC Medical Genetics
https://www.readbyqxmd.com/read/29537177/birt-hogg-dub%C3%A3-syndrome-an-underdiagnosed-genetic-tumor-syndrome
#8
REVIEW
Ortrud K Steinlein, Birgit Ertl-Wagner, Thomas Ruzicka, Elke C Sattler
Birt-Hogg-Dubé syndrome (BHD, also referred to as Hornstein-Knickenberg syndrome) is an autosomal dominant tumor syndrome caused by mutations in the FLCN gene located on chromosome 17. Depending on their age, patients with BHD may exhibit various clinical signs and symptoms. Disease severity can vary greatly among members of the same family. Early symptoms include basal lung cysts, which can lead to recurrent spontaneous pneumothoraces. The majority of patients (> 90 %) develop multiple fibrofolliculomas, especially on the face and upper trunk, in the second or third decade of life...
March 2018: Journal der Deutschen Dermatologischen Gesellschaft, Journal of the German Society of Dermatology: JDDG
https://www.readbyqxmd.com/read/29537155/birt-hogg-dub%C3%A3-syndrom-ein-zu-selten-diagnostiziertes-erbliches-tumorsyndrom
#9
REVIEW
Ortrud K Steinlein, Birgit Ertl-Wagner, Thomas Ruzicka, Elke C Sattler
Das Birt-Hogg-Dubé-Syndrom (BHD-Syndrom, eigentlich Hornstein-Knickenberg- Syndrom) ist ein autosomal dominant erbliches Tumorsyndrom, welches durch Mutationen im FLCN-Gen auf Chromosom 17 verursacht wird. Patienten mit BHD-Syndrom können altersabhängig verschiedene Symptome zeigen, deren Ausprägung auch innerhalb einer Familie unterschiedlich schwer sein kann. Ein frühes Symptom sind basal betonte Lungenzysten, welche Ursache wiederholter Spontanpneumothoraces sein können. Die Mehrheit der Patienten (> 90 %) entwickelt im mittleren Lebensalter zahlreiche Fibrofollikulome vor allem im Gesicht und am Oberkörper...
March 2018: Journal der Deutschen Dermatologischen Gesellschaft, Journal of the German Society of Dermatology: JDDG
https://www.readbyqxmd.com/read/29469743/treatment-of-selective-antibody-deficiency-with-ivig-resulting-in-decreased-frequency-of-streptococcal-infection-and-improvement-of-guttate-psoriasis
#10
Maulik M Dhandha, Elaine C Siegfried, Alan P Knutsen
The association between guttate psoriasis and infection with group A Streptococcus (GAS) has been well established in the medical literature. However, responses to treatments aimed at GAS eradication such as systemic antibiotics or tonsillectomy are inconsistent. Further complicating treatment recommendations for a disease with a suspected microbial trigger, the standard therapy for severe psoriasis is with systemic immunosuppressant medications. This case report illustrates the role of GAS as a trigger for acute onset severe psoriasis in a child whose skin disease initially worsened with a trial of methotrexate...
August 15, 2017: Dermatology Online Journal
https://www.readbyqxmd.com/read/29357828/birt-hogg-dub%C3%A3-syndrome-in-two-chinese-families-with-mutations-in-the-flcn-gene
#11
Xiaocan Hou, Yuan Zhou, Yun Peng, Rong Qiu, Kun Xia, Beisha Tang, Wei Zhuang, Hong Jiang
BACKGROUND: Birt-Hogg-Dubé syndrome is an autosomal dominant hereditary condition caused by mutations in the folliculin-encoding gene FLCN (NM_144997). It is associated with skin lesions such as fibrofolliculoma, acrochordon and trichodiscoma; pulmonary lesions including spontaneous pneumothorax and pulmonary cysts and renal cancer. METHODS: Genomic DNA was extracted from peripheral venous blood samples of the propositi and their family members. Genetic analysis was performed by whole exome sequencing and Sanger sequencing aiming at corresponding exons in FLCN gene to explore the genetic mutations of these two families...
January 22, 2018: BMC Medical Genetics
https://www.readbyqxmd.com/read/29321196/birt-hogg-dub%C3%A3-syndrome-spontaneous-pneumothorax-as-a-first-symptom
#12
Kirse Bock, Zuzana Lohse, Poul Henning Madsen, Ole Hilberg
Birt-Hogg-Dubé syndrome (BHDS) is a rare hereditary autosomal dominant condition characterised by benign cutaneous lesions, lung cysts, increased risk of spontaneous pneumothorax and renal cancer. It shows great heterogenous presentation within and between affected families. We report a case of a Danish female patient with recurrent pneumothoraces as the first symptom of BHDS. Over the years, she developed skin changes, and a family history of skin changes, pneumothoraces and renal cancer was discovered. BHDS was suspected, a genetic analysis was performed and a pathogenic variation c...
January 9, 2018: BMJ Case Reports
https://www.readbyqxmd.com/read/29223882/recurrent-renal-cancer-in-birt-hogg-dub%C3%A3-syndrome-a-case-report
#13
Hammad Ather, Nida Zahid
INTRODUCTION: Birt-Hogg-Dubé syndrome (BHDS) is a rare autosomal dominant disease. It is caused by constitutional mutations in the FLCN gene. Since BHDS is a rare syndrome therefore it is unknown to many physicians. However, it is important to identify this rare syndrome at early stages because incidence of renal cancer in BHD patients is very high and its detection at early stages can prevent its metastasis. Hence, we want to present a case of BHDS and draw the attention of the treating physician to this rare inherited disorder and discuss its appropriate diagnosis and management...
2018: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/29157599/skin-lesions-of-birt-hogg-dub%C3%A3-syndrome-clinical-and-histopathological-findings-in-31-japanese-patients-who-presented-with-pneumothorax-and-or-multiple-lung-cysts
#14
Chikako Iwabuchi, Hiroki Ebana, Akira Ishiko, Azusa Negishi, Teruaki Mizobuchi, Toshio Kumasaka, Masatoshi Kurihara, Kuniaki Seyama
BACKGROUND: Birt-Hogg-Dubé syndrome (BHDS) (OMIM #135150) is an autosomal dominant disease, characterized by fibrofolliculomas (FFs) of the skin, pulmonary cysts with/without pneumothorax, and renal tumors. The prevalence of skin manifestations reported for Japanese BHDS patients is lower (<30%) compared with that of Western countries (75∼90%), which appear to be underestimated. OBJECTIVE: To precisely examine the prevalence of skin lesions with dermoscopy and histopathology with reference to genetic analyses...
January 2018: Journal of Dermatological Science
https://www.readbyqxmd.com/read/29147010/epithelial-folliculin-is-involved-in-airway-inflammation-in-workers-exposed-to-toluene-diisocyanate
#15
Duy L Pham, Tu Hk Trinh, Ga-Young Ban, Seung-Hyun Kim, Hae-Sim Park
Toluene diisocyanate (TDI) exposure can directly activate and damage airway epithelium. Folliculin (FLCN) is a protein expressed by human airway epithelial cells (HAECs) to maintain airway epithelial integrity and survival. This study investigated the involvement of FLCN in the pathogenesis of TDI-induced occupational asthma (OA). Enzyme-linked immunosorbent assay was used to measure serum levels of FLCN in TDI-exposed subjects (93 TDI-OA patients and 119 asymptomatic exposed controls (AEC)), 200 non-occupational asthma (NOA) patients and 71 unexposed healthy normal controls (NCs)...
November 17, 2017: Experimental & Molecular Medicine
https://www.readbyqxmd.com/read/29124032/birt-hogg-dub%C3%A3-syndrome-manifesting-as-spontaneous-pneumothorax-a-novel-mutation-of-the-folliculin-gene
#16
Kyung Soo Kim, Hang Jun Choi, Woori Jang, Hyojin Chae, Myungshin Kim, Seok Whan Moon
Birt-Hogg-Dubé syndrome (BHDS) is a rare disease with autosomal dominant inheritance that manifests through skin tumors, pulmonary cystic lesions, and renal tumors. A mutation of FLCN located on chromosome 17p11.2, which encodes a tumor-suppressor protein (folliculin), is responsible for the development of BHDS. We report the case of a patient presenting with spontaneous pneumothorax, in whom a familial genetic study revealed a novel nonsense mutation: p.(Arg379*) in FLCN .
October 2017: Korean Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29121788/fluorescence-image-guided-neurosurgery
#17
Sadao Kaneko, Muftah S Eljamel
Surgery plays an important role in the management of high-grade gliomas (HGG) and imparts significant tumor-free and overall survival advantages. However HGG margins are often invisible, making their gross total resection (GTR) a difficult task. Hence intraoperative technology such as intraoperative fluorescence was a revolutionary discovery. A critical literature review revealed fluorescence improved the GTR of HGG from 36% using standard surgery to 74.5 and 84.4% using aminolevulinic acid (ALA) or fluorescein (FLCN), respectively...
November 2017: Future Oncology
https://www.readbyqxmd.com/read/29025585/genetic-gastric-cancer-susceptibility-in-the-international-clinical-cancer-genomics-community-research-network
#18
Thomas Slavin, Susan L Neuhausen, Christina Rybak, Ilana Solomon, Bita Nehoray, Kathleen Blazer, Mariana Niell-Swiller, Aaron W Adamson, Yate-Ching Yuan, Kai Yang, Sharon Sand, Danielle Castillo, Josef Herzog, Xiwei Wu, Shu Tao, Tanya Chavez, Yanghee Woo, Joseph Chao, Pamela Mora, Darling Horcasitas, Jeffrey Weitzel
Few susceptibility genes for gastric cancer have been identified. We sought to identify germline susceptibility genes from participants with gastric cancer from an international hereditary cancer research network. Adults with gastric cancer of any histology, and with a germline DNA sample (n = 51), were retrospectively selected. For those without previously identified germline mutations (n = 43), sequencing was performed for 706 candidate genes. Twenty pathogenic or likely pathogenic variants were identified among 18 participants...
October 2017: Cancer Genetics
https://www.readbyqxmd.com/read/29018350/folliculin-interacts-with-rab35-to-regulate-egf-induced-egfr-degradation
#19
Jianchao Zheng, Biao Duan, Shixiu Sun, Jie Cui, Jun Du, Yujie Zhang
Aims and Hypothesis: This study aims to investigate the mechanism involved in intracellular regulation of EGFR degradation induced by EGF. Methods: Phosphorylation of proteins related to EGFR signaling was examined by western blot analysis. Activation, connection between Rab35 and folliculin (FLCN) were assessed by pulldown, coimmunoprecipitation assays separately. The relationship between FLCN and cell growth was detected using gene overexpression and knock-down techniques. Results: Here, we demonstrate that interfering with FLCN, a tumor suppressor, reduces the rate of EGF-induced EGFR degradation, resulting in prolonged activation of downstream signaling...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28980860/the-roles-of-intrinsic-disorder-based-liquid-liquid-phase-transitions-in-the-dr-jekyll-mr-hyde-behavior-of-proteins-involved-in-amyotrophic-lateral-sclerosis-and-frontotemporal-lobar-degeneration
#20
Vladimir N Uversky
Pathological developments leading to amyotrophic lateral sclerosis (ALS) and frontotemporal lobar degeneration (FTLD) are associated with misbehavior of several key proteins, such as SOD1 (superoxide dismutase 1), TARDBP/TDP-43, FUS, C9orf72, and dipeptide repeat proteins generated as a result of the translation of the intronic hexanucleotide expansions in the C9orf72 gene, PFN1 (profilin 1), GLE1 (GLE1, RNA export mediator), PURA (purine rich element binding protein A), FLCN (folliculin), RBM45 (RNA binding motif protein 45), SS18L1/CREST, HNRNPA1 (heterogeneous nuclear ribonucleoprotein A1), HNRNPA2B1 (heterogeneous nuclear ribonucleoprotein A2/B1), ATXN2 (ataxin 2), MAPT (microtubule associated protein tau), and TIA1 (TIA1 cytotoxic granule associated RNA binding protein)...
2017: Autophagy
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