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Nelson ND, Xu F, Peranteau WH, Li M, Pogoriler J. Morphologic Features in Congenital Pulmonary Airway Malformations and Pulmonary Sequestrations Correlate With Mutation Status: A Mechanistic Approach to Classification. Am J Surg Pathol 2023; 47:568-579. [PMID: 36802201 DOI: 10.1097/pas.0000000000002025] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Accepted: 01/13/2023] [Indexed: 02/23/2023]
Abstract
Congenital pulmonary airway malformations (CPAMs) have a range of morphologies with varying cyst sizes and histologic features (types 1 to 3). Evidence suggested they arise secondary to bronchial atresia, however, we recently showed that cases with type 1 and 3 morphology are driven by mosaic KRAS mutations. We hypothesized that 2 distinct mechanisms account for most CPAMs: one subset is secondary to KRAS mosaicism and another is due to bronchial atresia. Cases with type 2 histology, similar to sequestrations, would be related to obstruction and therefore negative for KRAS mutations regardless of cyst size. We sequenced KRAS exon 2 in type 2 CPAMs, cystic intralobar and extralobar sequestrations, and intrapulmonary bronchogenic cysts. All were negative. Most sequestrations had a large airway in the subpleural parenchyma adjacent to the systemic vessel, anatomically confirming bronchial obstruction. We compared morphology to type 1 and 3 CPAMs. On average, type 1 CPAMs had significantly larger cysts, but there remained substantial size overlap between KRAS mutant and wild-type lesions. Features of mucostasis were frequent in sequestrations and type 2 CPAMs, while their cysts were generally simple and round with flat epithelium. Features of cyst architectural and epithelial complexity were more common in type 1 and 3 CPAMs, which rarely showed mucostasis. Similarity in histologic features among cases that are negative for KRAS mutation support the hypothesis that, like sequestrations, the malformation of type 2 CPAMs is related to obstruction during development. A mechanistic approach to classification may improve existing subjective morphologic methods.
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Affiliation(s)
- Nya D Nelson
- Departments of Pathology and Laboratory Medicine
- Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA
| | - Feng Xu
- Departments of Pathology and Laboratory Medicine
| | - William H Peranteau
- Surgery, The Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania
| | - Marilyn Li
- Departments of Pathology and Laboratory Medicine
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Nelson ND, Xu F, Chandrasekaran P, Litzky LA, Peranteau WH, Frank DB, Li M, Pogoriler J. Defining the spatial landscape of KRAS mutated congenital pulmonary airway malformations: a distinct entity with a spectrum of histopathologic features. Mod Pathol 2022; 35:1870-1881. [PMID: 35794233 PMCID: PMC10462420 DOI: 10.1038/s41379-022-01129-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 06/09/2022] [Accepted: 06/10/2022] [Indexed: 12/24/2022]
Abstract
The potential pathogenetic mechanisms underlying the varied morphology of congenital pulmonary airway malformations (CPAMs) have not been molecularly determined, but a subset have been shown to contain clusters of mucinous cells (MCC). These clusters are believed to serve as precursors for potential invasive mucinous adenocarcinoma, and they are associated with KRAS codon 12 mutations. To assess the universality of KRAS mutations in MCCs, we sequenced exon 2 of KRAS in 61 MCCs from 18 patients, and we found a KRAS codon 12 mutation in all 61 MCCs. Furthermore, all MCCs from a single patient always had the same KRAS mutation, and the same KRAS mutation was also found in non-mucinous lesional tissue. Next generation sequencing of seven MCCs showed no other mutations or copy number variations. Sequencing of 46 additional CPAMs with MCCs revealed KRAS mutations in non-mucinous lesional tissue in all cases. RNA in situ hybridization confirmed widespread distribution of cells with mutant KRAS RNA, even extending outside of the bronchiolar type epithelium. We identified 25 additional CPAMs with overall histologic architecture similar to CPAMs with KRAS mutations but without identifiable MCCs, and we found KRAS mutations in 17 (68%). The histologic features of these KRAS mutated CPAMs included type 1 and type 3 morphology, as well as lesions with an intermediate histologic appearance, and analysis revealed a strong correlation between the specific amino acid substitution and histomorphology. These findings, together with previously published model organism data, suggests that the formation of type 1 and 3 CPAMs is driven by mosaic KRAS mutations arising in the lung epithelium early in development and places them within the growing field of mosaic RASopathies. The presence of widespread epithelial mutation explains late metastatic disease in incompletely resected patients and reinforces the recommendation for complete resection of these lesions.
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Affiliation(s)
- Nya D Nelson
- Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
- Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - Feng Xu
- Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - Prashant Chandrasekaran
- Department of Pediatrics, The Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - Leslie A Litzky
- Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - William H Peranteau
- Department of Surgery, The Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - David B Frank
- Department of Pediatrics, The Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - Marilyn Li
- Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
| | - Jennifer Pogoriler
- Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA.
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Li EY, Xu J, Nelson ND, Teachey DT, Tan K, Romberg N, Behrens E, Pillai V. Kikuchi-Fujimoto disease is mediated by an aberrant type I interferon response. Mod Pathol 2022; 35:462-469. [PMID: 34952944 DOI: 10.1038/s41379-021-00992-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 11/24/2021] [Accepted: 11/29/2021] [Indexed: 11/09/2022]
Abstract
Kikuchi-Fujimoto disease (KFD) is a reactive lymphadenitis of unclear etiology. To understand the pathogenesis of KFD, we performed targeted RNA sequencing of a well-characterized cohort of 15 KFD specimens with 9 non-KFD lymphadenitis controls. Two thousand and three autoimmunity-related genes were evaluated from archived formalin-fixed paraffin-embedded lymph node tissue and analyzed by a bioinformatics approach. Differential expression analysis of KFD cases compared to controls revealed 44 significantly upregulated genes in KFD. Sixty-eight percent of these genes were associated with the type I interferon (IFN) response pathway. Key component of the pathway including nucleic acid sensors, IFN regulatory factors, IFN-induced antiviral proteins, IFN transcription factors, IFN-stimulated genes, and IFN-induced cytokines were significantly upregulated. Unbiased gene expression pathway analysis revealed enrichment of IFN signaling and antiviral pathways in KFD. Protein-protein interaction analysis and a molecular complex detection algorithm identified a densely interacting 15-gene module of type I IFN pathway genes. Apoptosis regulator IFI6 was identified as a key seed gene. Transcription factor target analysis identified enrichment of IFN-response elements and IFN-response factors. T-cell-associated genes were upregulated while myeloid and B-cell-associated genes were downregulated in KFD. CD123+ plasmacytoid dendritic cells (PDCs) and activated T cells were noted in KFD. In conclusion, KFD is mediated by an aberrant type I interferon response that is likely driven by PDCs and T cells.
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Affiliation(s)
- Elizabeth Y Li
- Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Yale School of Medicine, Yale University, New Haven, CT, USA
| | - Jason Xu
- Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Nya D Nelson
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - David T Teachey
- Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Division of Oncology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Kai Tan
- Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Division of Oncology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Neil Romberg
- Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Division of Allergy and Immunology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Ed Behrens
- Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Division of Rheumatology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Vinodh Pillai
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA. .,Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA, USA. .,Division of Hematopathology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
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Nelson ND, Meng W, Rosenfeld AM, Bullman S, Sekhar Pedamallu C, Nomburg JL, Wertheim GB, Paessler ME, Pinkus G, Hornick JL, Meyerson M, Luning Prak ET, Pillai V. Characterization of Plasmacytoid Dendritic Cells, Microbial Sequences, and Identification of a Candidate Public T-Cell Clone in Kikuchi-Fujimoto Disease. Pediatr Dev Pathol 2021; 24:193-205. [PMID: 33530869 DOI: 10.1177/1093526620987961] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
OBJECTIVES Kikuchi-Fujimoto disease (KFD) is a self-limited lymphadenitis of unclear etiology. We aimed to further characterize this disease in pediatric patients, including evaluation of the CD123 immunohistochemical (IHC) staining and investigation of potential immunologic and infectious causes. METHODS Seventeen KFD cases and 12 controls were retrospectively identified, and the histologic and clinical features were evaluated. CD123 IHC staining was quantified by digital image analysis. Next generation sequencing was employed for comparative microbial analysis via RNAseq (5 KFD cases) and to evaluate the immune repertoire (9 KFD cases). RESULTS In cases of lymphadenitis with necrosis, >0.85% CD123+ cells by IHC was found to be six times more likely in cases with a final diagnosis of KFD (sensitivity 75%, specificity 87.5%). RNAseq based comparative microbial analysis did not detect novel or known pathogen sequences in KFD. A shared complementarity determining region 3 (CDR3) sequence and use of the same T-cell receptor beta variable region family was identified in KFD LNs but not controls, and was not identified in available databases. CONCLUSIONS Digital quantification of CD123 IHC can distinguish KFD from other necrotizing lymphadenitides. The presence of a unique shared CDR3 sequence suggests that a shared antigen underlies KFD pathogenesis.
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Affiliation(s)
- Nya D Nelson
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.,Department of Pathology and Laboratory Medicine, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Wenzhao Meng
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Aaron M Rosenfeld
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Susan Bullman
- Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, Massachusetts.,Department of Medical Oncology and Center for Cancer Genome Discovery, Dana-Farber Cancer Institute, Boston, Massachusetts.,Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Chandra Sekhar Pedamallu
- Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, Massachusetts.,Department of Medical Oncology and Center for Cancer Genome Discovery, Dana-Farber Cancer Institute, Boston, Massachusetts.,Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Jason L Nomburg
- Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, Massachusetts.,Department of Medical Oncology and Center for Cancer Genome Discovery, Dana-Farber Cancer Institute, Boston, Massachusetts.,Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Gerald B Wertheim
- Department of Pathology and Laboratory Medicine, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Michele E Paessler
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.,Department of Pathology and Laboratory Medicine, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Geraldine Pinkus
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Jason L Hornick
- Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Matthew Meyerson
- Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, Massachusetts.,Department of Medical Oncology and Center for Cancer Genome Discovery, Dana-Farber Cancer Institute, Boston, Massachusetts.,Department of Pathology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Eline T Luning Prak
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Vinodh Pillai
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.,Department of Pathology and Laboratory Medicine, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
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Nelson ND, McMahon CM, El-Sharkawy Navarro F, Freyer CW, Roth JJ, Luger SM, Bagg A, Morrissette JJD. Rapid fluorescence in situ hybridisation optimises induction therapy for acute myeloid leukaemia. Br J Haematol 2020; 191:935-938. [PMID: 33460058 DOI: 10.1111/bjh.17082] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 08/11/2020] [Indexed: 11/29/2022]
Affiliation(s)
- Nya D Nelson
- Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, USA
| | - Christine M McMahon
- Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, USA
| | - Farah El-Sharkawy Navarro
- Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, USA
| | - Craig W Freyer
- Department of Pharmacy, Hospital of the University of Pennsylvania, Philadelphia, PA, USA
| | - Jacquelyn J Roth
- Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, USA
| | - Selina M Luger
- Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, USA
| | - Adam Bagg
- Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, USA
| | - Jennifer J D Morrissette
- Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, USA
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Jain NK, Mostoufi-Moab S, Hawkes CP, Nelson ND, Surrey LF, Jones ZS, Adzick NS, Kazahaya K, Bauer AJ. Extrathyroidal Extension is an Important Predictor of Regional Lymph Node Metastasis in Pediatric Differentiated Thyroid Cancer. Thyroid 2020; 30:1037-1043. [PMID: 31573414 DOI: 10.1089/thy.2019.0229] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Introduction: The American Joint Committee Cancer (AJCC) TNM system predicts survival in patients with differentiated thyroid cancer (DTC). In the eighth edition of the AJCC TNM, microscopic extrathyroidal extension (microETE) was removed and tumor size >4 cm was maintained in the definition of T3 disease to reduce unnecessarily aggressive therapy for adults at low risk of death from DTC. In pediatric patients where DTC survival rates are high, the AJCC TNM is used to identify patients at increased risk of persistent, postsurgical disease, to identify patients who benefit from radioactive iodine therapy. The aim of this study was to assess the correlation of microETE with cervical lymph node (LN) metastasis in pediatric patients and to determine if tumor size or microETE is more informative in predicting regional LN disease. Methods: Patients with DTC <19 years of age at the time of thyroidectomy with AJCC T3 tumors (seventh edition) and the presence of LNs on the surgical specimen were included in this retrospective chart review. Pathological findings were confirmed by pathologist review. Results: Forty-five patients with AJCC T3 designation were included, 34 with microETE and 11 without microETE. Of those with microETE, 32 (94.1%) demonstrated regional LN metastasis compared with 5/11 patients (45.5%) without microETE (p = 0.001). In addition, microETE was associated with lateral neck LN metastasis (p = 0.004), bilateral disease (p = 0.001), and tumor multifocality (p = 0.003). Patients with microETE had smaller tumors (median = 2.5 cm, interquartile range [IQR]: 1.6-4.5) compared with patients without microETE (median = 5 cm, IQR: 4.2-5.4; p = 0.02). No increased association was found between microETE and vascular invasion, distant metastasis, or persistent/recurrent disease. Conclusions: In pediatric patients with DTC, microETE is a strong predictor of LN metastasis when compared with tumor size. For patients who do not undergo prophylactic central neck LN dissection, the presence of microETE predicts an increased risk of postsurgical disease and should be included in future revisions of the American Thyroid Association pediatric risk stratification categories.
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Affiliation(s)
- Neil K Jain
- Division of Endocrinology and Diabetes; The Children's Hospital of Philadelphia and The Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Sogol Mostoufi-Moab
- Division of Endocrinology and Diabetes; The Children's Hospital of Philadelphia and The Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Division of Oncology; The Children's Hospital of Philadelphia and The Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Colin P Hawkes
- Division of Endocrinology and Diabetes; The Children's Hospital of Philadelphia and The Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Nya D Nelson
- Department of Pathology and Laboratory Medicine, The Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Lea F Surrey
- Division of Anatomic Pathology; The Children's Hospital of Philadelphia and The Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Division of Genomic Diagnostics; The Children's Hospital of Philadelphia and The Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Zachary S Jones
- Division of Endocrinology and Diabetes; The Children's Hospital of Philadelphia and The Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - N Scott Adzick
- Department of Surgery; The Children's Hospital of Philadelphia and The Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Ken Kazahaya
- Department of Surgery; The Children's Hospital of Philadelphia and The Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Division of Pediatric Otorhinolaryngology, The Children's Hospital of Philadelphia and The Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Andrew J Bauer
- Division of Endocrinology and Diabetes; The Children's Hospital of Philadelphia and The Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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Nelson ND, Glaser L, Tondon R. Bugs in inflammatory bowel disease - A questionable therapy. Dig Liver Dis 2019; 51:323. [PMID: 30236764 DOI: 10.1016/j.dld.2018.08.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 08/13/2018] [Accepted: 08/16/2018] [Indexed: 12/11/2022]
Affiliation(s)
- Nya D Nelson
- Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, United States
| | - Laurel Glaser
- Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, United States
| | - Rashmi Tondon
- Department of Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania, Philadelphia, PA, United States.
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Nelson ND, Dodson LM, Escudero L, Sukumar AT, Williams CL, Mihalek I, Baldan A, Baird DM, Bertuch AA. The C-Terminal Extension Unique to the Long Isoform of the Shelterin Component TIN2 Enhances Its Interaction with TRF2 in a Phosphorylation- and Dyskeratosis Congenita Cluster-Dependent Fashion. Mol Cell Biol 2018; 38:e00025-18. [PMID: 29581185 PMCID: PMC5974431 DOI: 10.1128/mcb.00025-18] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Accepted: 03/18/2018] [Indexed: 01/08/2023] Open
Abstract
TIN2 is central to the shelterin complex, linking the telomeric proteins TRF1 and TRF2 with TPP1/POT1. Mutations in TINF2, which encodes TIN2, that are found in dyskeratosis congenita (DC) result in very short telomeres and cluster in a region shared by the two TIN2 isoforms, TIN2S (short) and TIN2L (long). Here we show that TIN2L, but not TIN2S, is phosphorylated. TRF2 interacts more with TIN2L than TIN2S, and both the DC cluster and phosphorylation promote this enhanced interaction. The binding of TIN2L, but not TIN2S, is affected by TRF2-F120, which is also required for TRF2's interaction with end processing factors such as Apollo. Conversely, TRF1 interacts more with TIN2S than with TIN2L. A DC-associated mutation further reduces TIN2L-TRF1, but not TIN2S-TRF1, interaction. Cells overexpressing TIN2L or phosphomimetic TIN2L are permissive to telomere elongation, whereas cells overexpressing TIN2S or phosphodead TIN2L are not. Telomere lengths are unchanged in cell lines in which TIN2L expression has been eliminated by clustered regularly interspaced short palindromic repeat (CRISPR)/Cas9-mediated mutation. These results indicate that TIN2 isoforms are biochemically and functionally distinguishable and that shelterin composition could be fundamentally altered in patients with TINF2 mutations.
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Affiliation(s)
- Nya D Nelson
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA
- Division of Hematology/Oncology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Lois M Dodson
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA
- Division of Hematology/Oncology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Laura Escudero
- Division of Cancer and Genetics, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Ann T Sukumar
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA
- Division of Hematology/Oncology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Christopher L Williams
- Division of Hematology/Oncology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Ivana Mihalek
- Bioinformatics Institute, Agency for Science Technology and Research, Singapore, Singapore
| | - Alessandro Baldan
- Division of Hematology/Oncology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
| | - Duncan M Baird
- Division of Cancer and Genetics, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Alison A Bertuch
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas, USA
- Division of Hematology/Oncology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas, USA
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Nelson ND, Marcogliese A, Bergstrom K, Scheurer M, Mahoney D, Bertuch AA. Thrombopoietin Measurement as a Key Component in the Evaluation of Pediatric Thrombocytosis. Pediatr Blood Cancer 2016; 63:1484-7. [PMID: 27100794 PMCID: PMC4916014 DOI: 10.1002/pbc.26032] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2016] [Accepted: 03/31/2016] [Indexed: 01/12/2023]
Abstract
JAK2, MPL, and CALR mutations, which underlie essential thrombocythemia (ET) in most adults, are infrequent in children. Consequently, additional tests are needed to confirm pediatric ET diagnoses. We report a child with suspected ET and normal JAK2, MPL, and CALR analyses. Serum thrombopoietin (TPO) was markedly elevated, leading to analysis of the TPO gene, TPHO, which contains an upstream open reading frame (uORF) known to repress THPO translation. Sequencing revealed a de novo, germline stopgain mutation in the uORF, explaining the elevated TPO and thrombocytosis. This finding suggests that screening TPO levels and, if elevated, THPO 5' UTR sequencing could be diagnostic.
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Affiliation(s)
- Nya D. Nelson
- Medical Scientist Training Program, Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, TX
| | - Andrea Marcogliese
- Department of Pathology & Immunology, Baylor College of Medicine, Houston, TX,Department of Pediatrics, Baylor College of Medicine, Houston, TX
| | - Katie Bergstrom
- Department of Pediatrics, Baylor College of Medicine, Houston, TX
| | - Michael Scheurer
- Department of Pediatrics, Baylor College of Medicine, Houston, TX
| | - Donald Mahoney
- Department of Pediatrics, Baylor College of Medicine, Houston, TX
| | - Alison A. Bertuch
- Department of Pediatrics, Baylor College of Medicine, Houston, TX,Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, TX
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10
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Nelson ND, Bertuch AA. Dyskeratosis congenita as a disorder of telomere maintenance. Mutat Res 2011; 730:43-51. [PMID: 21745483 DOI: 10.1016/j.mrfmmm.2011.06.008] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2011] [Revised: 06/16/2011] [Accepted: 06/25/2011] [Indexed: 12/11/2022]
Abstract
Since 1998, there have been great advances in our understanding of the pathogenesis of dyskeratosis congenita (DC), a rare inherited bone marrow failure and cancer predisposition syndrome with prominent mucocutaneous abnormalities and features of premature aging. DC is now characterized molecularly by the presence of short age-adjusted telomeres. Mutations in seven genes have been unequivocally associated with DC, each with a role in telomere length maintenance. These observations, combined with knowledge that progressive telomere shortening can impose a proliferative barrier on dividing cells and contribute to chromosome instability, have led to the understanding that extreme telomere shortening drives the clinical features of DC. However, some of the genes implicated in DC encode proteins that are also components of H/ACA-ribonucleoprotein enzymes, which are responsible for the post-translational modification of ribosomal and spliceosomal RNAs, raising the question whether alterations in these activities play a role in the pathogenesis of DC. In addition, recent reports suggest that some cases of DC may not be characterized by short age-adjusted telomeres. This review will highlight our current knowledge of the telomere length defects in DC and the factors involved in its development.
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Affiliation(s)
- Nya D Nelson
- Department of Molecular and Human Genetics, Texas Children's Hospital, Houston, TX 77030, USA
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Sasa GS, Ribes-Zamora A, Nelson ND, Bertuch AA. Three novel truncating TINF2 mutations causing severe dyskeratosis congenita in early childhood. Clin Genet 2011; 81:470-8. [PMID: 21477109 DOI: 10.1111/j.1399-0004.2011.01658.x] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Dyskeratosis congenita (DC) is a telomere biology disorder characterized by a mucocutaneous triad, aplastic anemia, and predisposition to cancer. Mutations in a narrow segment of TINF2 exon 6 have been recognized to cause often-severe DC that is either sporadic or autosomal dominant. We describe three children with very early presentations of DC, including one with the severe variant known as Revesz syndrome. Although most TINF2 mutations reported to date are missense changes, each of our patients carried a novel heterozygous nonsense or frameshift mutation, revealing a new 5' boundary to the affected gene segment in patients with DC. Examination of patient-derived lymphoblastoid cell lines revealed stable expression of the predicted truncated TIN2 proteins. In co-immunoprecipitation assays, the ability of a truncation mutant to interact with TRF1 was severely impaired, whereas the ability of the most common DC-associated mutant was much less affected. This suggests that the disruption of TIN2-TRF1 interaction may contribute to the severe clinical phenotype observed in the context of the TIN2 truncation mutation, but is unlikely to be the primary cause of telomere shortening associated with the more prevalent TIN2 missense mutations. Telomere flow-fluorescent in situ hybridization (FISH) analysis of one pedigree showed the dramatic effect a de novo nonsense TINF2 mutation had on telomere length in early development. These cases underscore the severe manifestations of truncating TINF2 mutations.
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Affiliation(s)
- G S Sasa
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
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Nelson ND, Trail M, Van JN, Appel SH, Lai EC. Quality of Life in Patients with Amyotrophic Lateral Sclerosis: Perceptions, Coping Resources, and Illness Characteristics. J Palliat Med 2003; 6:417-24. [PMID: 14509487 DOI: 10.1089/109662103322144736] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE To assess and compare quality of life (QOL) for two groups of patients with amyotrophic lateral sclerosis (ALS): (1) those reporting a more positive quality of life and (2) those reporting a more negative quality of life. METHODS One hundred patients with ALS participated in this cross-sectional, descriptive study conducted in an ALS clinic. Quality of life was graded in two ways: (1) a global question about present QOL, giving four choices (life could not be better, usually good, sometimes good, and not good) which the researchers divided into two groups: the more positive QOL and the more negative QOL and (2) patients' responses to a 25-item internally generated open-ended survey. The Appel ALS Rating Scale measured objective data for physical strength and functioning. RESULTS One hundred patients (68 men and 32 women) with a mean age of 58.2 (range, 29-82) years participated in the study. The average disease duration was 1.9 (range, 0.08-15) years. Patients who reported the more positive QOL were younger, had a shorter disease duration, and experienced less disease severity (p < 0.05). Those endorsing the more positive QOL reported more adequate finances and less stress over disease characteristics (p < 0.05). CONCLUSIONS Illness characteristics do influence QOL for patients with ALS, but they are not the only concerns. When measuring QOL in patients with ALS, the unique features of the psychosocial factors, personality traits, and spiritual factors, in addition to disease symptoms, need to be identified and discussed with patients and families throughout the illness.
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Affiliation(s)
- N D Nelson
- Department of Neurology, Baylor College of Medicine, Houston, Texas 77030, USA
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Michael DA, Dickmann DI, Isebrands JG, Nelson ND. Photosynthesis patterns during the establishment year within two Populus clones with contrasting morphology and phenology. Tree Physiol 1990; 6:11-27. [PMID: 14972957 DOI: 10.1093/treephys/6.1.11] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Diurnal and seasonal photosynthesis patterns were studied in poplar clones Populus tristis Fisch. x P. balsamfera L. cv. Tristis #1 (NC 5260) and Populus x euramericana (Dode) Guiner cv. Eugenei (NC 5326, Carolina poplar) during their first season in the field in a short rotation, intensive culture plantation. Photosynthetic rates were low in immature leaves; increased basipetally on the shoot and peaked in leaves that had recently reached full expansion; and thereafter declined in lower-crown leaves in both clones. Photosynthesis was associated with leaf age and stomatal conductance in immature leaves; adaxial photosynthetic photon flux density (PPFD) and leaf temperature in recently mature leaves; and leaf age and adaxial PPFD in lower-crown leaves. Diurnal photosynthesis patterns within trees were highly variable due to differential light interception among leaves. Results of clonal comparisons of photosynthetic rates were dependent on which leaves were pooled for comparison and how photosynthesis was expressed. Compared to Eugenei, Tristis produced smaller leaves which had higher unit-area photosynthesis rates. The more indeterminate Eugenei outgrew Tristis principally because it more fully utilized the growing season for leaf area production. Photosynthetic production integrated over the growing season was closely related to dry matter production in both clones.
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Affiliation(s)
- D A Michael
- Department of Forestry, Michigan State University, East Lansing, MI 48824, USA
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Michael DA, Isebrands JG, Dickmann DI, Nelson ND. Growth and development during the establishment year of two Populus clones with contrasting morphology and phenology. Tree Physiol 1988; 4:139-152. [PMID: 14972824 DOI: 10.1093/treephys/4.2.139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Weekly morphological measurements of trees in permanent growth plots and periodic destructive sampling were used to monitor growth and development of two Populus clones with contrasting morphology and phenology during the establishment year in a short-rotation, intensive-culture system. Tristis (P. tristis Fisch. x P. balsamifera L.) grew rapidly for 48 days before setting bud in July. By contrast, Eugenei (P. x euramericana (Dode) Guinier) grew at a slower rate than Tristis, but maintained this rate for 75 days before setting bud in September. By early October, the total leaf area and dry weight of Eugenei exceeded that of Tristis by 39 and 11%, respectively. In addition, Eugenei had a greater harvest index than Tristis throughout most of the growing season because a larger proportion of photosynthate produced was directed to shoot growth; however, a high shoot/root ratio in Eugenei predisposed it to water stress. Differences in aboveground biomass between clones were largely attributable to clonal differences in seasonal leaf area development.
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Affiliation(s)
- D A Michael
- Software Innovations, Battle Creek, MI 49017, USA
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Abstract
In two related experiments on recognition-on touch and audition-accuracy rates were obtained from congenitally blind subjects and compared with those for normally sighted subjects. In Exp. 1, 5 blind subjects inspected, i.e., handled, 150 common objects and were tested after a delay of 7 days. In Exp. 2, 9 blind subjects listened to 194 naturalistic sounds and were also tested after a 7-day delay. Accuracy of tactile recognition for the blind was 89.4% while it was 87.9% for the normally sighted. Sound recognition by blind subjects was 76.6% and for the normally sighted it was 78.4%. Neither difference was statistically significant.
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