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Pacot L, Masliah-Planchon J, Petcu A, Terris B, Gauthier Villars M, Lespinasse J, Wolkenstein P, Vincent-Salomon A, Vidaud D, Pasmant E. Breast cancer risk in NF1-deleted patients. J Med Genet 2024; 61:428-429. [PMID: 38154814 DOI: 10.1136/jmg-2023-109682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 12/05/2023] [Indexed: 12/30/2023]
Affiliation(s)
- Laurence Pacot
- Institut Cochin, Inserm U1016, CNRS UMR8104, Université Paris Cité, CARPEM, Paris, France
- Department of genetics, Fédération de Génétique et Médecine Génomique, Hôpital Cochin, DMU BioPhyGen, AP-HP.Centre-Université Paris Cité, Paris, France
| | | | - Adina Petcu
- Department of Pathology, Centre Hospitalier Métropole Savoie, Chambery, France
| | - Benoit Terris
- Department of Pathology, Hôpital Cochin, Assistance Publique-Hopitaux de Paris, Paris, France
| | | | - James Lespinasse
- Unité de Génétique médicale, Centre Hospitalier Métropole Savoie, Chambéry, France
| | - Pierre Wolkenstein
- Department of Dermatology, Hôpital Henri Mondor, Assistance Publique-Hôpitaux de Paris, Créteil, France
- Centre d'Investigation Clinique 1430, INSERM, Hôpital Henri-Mondor, Assistance Publique-Hôpitaux de Paris, Referral Center of Neurofibromatosis, Créteil, France
| | - Anne Vincent-Salomon
- Department of Pathology, Curie Institute Hospital Group, Paris, Île-de-France, France
| | - Dominique Vidaud
- Institut Cochin, Inserm U1016, CNRS UMR8104, Université Paris Cité, CARPEM, Paris, France
- Department of genetics, Fédération de Génétique et Médecine Génomique, Hôpital Cochin, DMU BioPhyGen, AP-HP.Centre-Université Paris Cité, Paris, France
| | - Eric Pasmant
- Institut Cochin, Inserm U1016, CNRS UMR8104, Université Paris Cité, CARPEM, Paris, France
- Department of genetics, Fédération de Génétique et Médecine Génomique, Hôpital Cochin, DMU BioPhyGen, AP-HP.Centre-Université Paris Cité, Paris, France
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Le Gall J, Dehainault C, Boutte M, Petitalot A, Caputo SM, Courtois L, Vacher S, Bieche I, Radvanyi F, Pacquement H, Doz F, Lumbroso-Le Rouic L, Gauthier Villars M, Stoppa-Lyonnet D, Lallemand F, Houdayer C, Golmard L. Germline HPF1 retrogene insertion in RB1 gene involved in cancer predisposition. J Med Genet 2023; 61:78-83. [PMID: 37541786 DOI: 10.1136/jmg-2022-109105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 07/23/2023] [Indexed: 08/06/2023]
Abstract
About half of the human genome is composed of repeated sequences derived from mobile elements, mainly retrotransposons, generally without pathogenic effect. Familial forms of retinoblastoma are caused by germline pathogenic variants in RB1 gene. Here, we describe a family with retinoblastoma affecting a father and his son. No pathogenic variant was identified after DNA analysis of RB1 gene coding sequence and exon-intron junctions. However, RB1 mRNA analysis showed a chimeric transcript with insertion of 114 nucleotides from HPF1 gene inside RB1 gene. This chimeric transcript led to an insertion of 38 amino acids in functional domain of retinoblastoma protein. Subsequent DNA analysis in RB1 intron 17 revealed the presence of a full-length HPF1 retrogene insertion in opposite orientation. Functional assay shows that this insertion has a deleterious impact on retinoblastoma protein function. This is the first report of a full-length retrogene insertion involved in human Mendelian disease leading to a chimeric transcript and a non-functional chimeric protein. Some retrogene insertions may be missed by standard diagnostic genetic testing, so contribution of retrogene insertions to human disease may be underestimated. The increasing use of whole genome sequencing in diagnostic settings will help to get a more comprehensive view of retrogenes.
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Affiliation(s)
- Jessica Le Gall
- Department of Genetics, Institut Curie, Paris, France
- Department of Genetics, PSL University, Paris, France
| | - Catherine Dehainault
- Department of Genetics, Institut Curie, Paris, France
- Department of Genetics, PSL University, Paris, France
| | - Matteo Boutte
- Department of Genetics, Institut Curie, Paris, France
- Department of Genetics, PSL University, Paris, France
| | - Ambre Petitalot
- Department of Genetics, Institut Curie, Paris, France
- Department of Genetics, PSL University, Paris, France
| | - Sandrine M Caputo
- Department of Genetics, Institut Curie, Paris, France
- Department of Genetics, PSL University, Paris, France
| | - Laura Courtois
- Department of Genetics, Institut Curie, Paris, France
- Department of Genetics, PSL University, Paris, France
| | - Sophie Vacher
- Department of Genetics, Institut Curie, Paris, France
- Department of Genetics, PSL University, Paris, France
| | - Ivan Bieche
- Department of Genetics, Institut Curie, Paris, France
- Université de Paris, Paris, France
| | - François Radvanyi
- Department of Genetics, PSL University, Paris, France
- Molecular Oncology Team, UMR144, Paris, France
| | - Hélène Pacquement
- Department of Genetics, PSL University, Paris, France
- Oncology Center SIREDO, Institut Curie, Paris, France
| | - François Doz
- Molecular Oncology Team, UMR144, Paris, France
- Oncology Center SIREDO, Institut Curie, Paris, France
| | - Livia Lumbroso-Le Rouic
- Department of Genetics, PSL University, Paris, France
- Department of Ophthalmology, Institut Curie, Paris, France
| | - Marion Gauthier Villars
- Department of Genetics, Institut Curie, Paris, France
- Department of Genetics, PSL University, Paris, France
| | - Dominique Stoppa-Lyonnet
- Department of Genetics, Institut Curie, Paris, France
- Department of Genetics, PSL University, Paris, France
| | - François Lallemand
- Department of Genetics, Institut Curie, Paris, France
- Department of Genetics, PSL University, Paris, France
| | - Claude Houdayer
- Department of Genetics, University Hospital Centre Rouen, Rouen, France
| | - Lisa Golmard
- Department of Genetics, Institut Curie, Paris, France
- Department of Genetics, PSL University, Paris, France
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Trabelsi Grati O, Zemoura L, Nhy C, Daniel C, Melaabi S, Callens C, Gauthier Villars M, Bièche I, Girard N. Long response to immune checkpoint inhibitors in metastatic NSCLC despite EGFR germline mutation. A case report. Lung Cancer 2022; 174:186-187. [PMID: 36156246 DOI: 10.1016/j.lungcan.2022.09.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 08/31/2022] [Accepted: 09/07/2022] [Indexed: 12/14/2022]
Abstract
First-line therapy in advanced non-small-cell-lung-cancer (NSCLC) is based on chemotherapy except for patients with a tumor proportion score for programmed death ligand 1 (PD-L1) of 50% or greater, pembrolizumab is administrated. However, patients with somatic-EGFR-mutated tumors had usually been excluded from clinical applications of immune checkpoint inhibitors (ICIs). Germline-EGFR-mutated-patients are known to not respond to EGFR-Tyrosine-Kinase-inhibitors (TKIs). But what about germline EGFR mutations and response to ICIs? Herein, we describe the case of a long response to ICIs treatment in a complex metastatic NSCLC with co-occuring EGFR germline and KRAS somatic mutations, high PD-L1 score and a smoking history.
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Affiliation(s)
| | - Leila Zemoura
- Pathology Department, Foch Hospital, Surrenes, France
| | - Caroline Nhy
- Radiology Department, Institut Curie Hospital, Paris, France
| | | | - Samia Melaabi
- Genetics Department, Institut Curie Hospital, Paris, France
| | - Céline Callens
- Genetics Department, Institut Curie Hospital, Paris, France
| | | | - Ivan Bièche
- Genetics Department, Institut Curie Hospital, Paris, France
| | - Nicolas Girard
- Department of Oncology, Institut Curie Hospital, Paris, France
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Masliah-Planchon J, Maillot L, Rybak N, Simaga F, Hamza A, Villars MG, Delattre O, Bourdeaut F. ATRT-21. Contribution of germline mosaic alterations of SMARCB1 in rhabdoid tumor predisposition syndrome. Neuro Oncol 2022. [PMCID: PMC9164641 DOI: 10.1093/neuonc/noac079.020] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Rhabdoid tumors are rare and aggressive tumors that usually arise in very young children. They are characterized by a bi-allelic inactivation of the SMARCB1 gene. Although the majority of alterations of SMARCB1 are acquired in tumors, a heterozygous germline alteration is seen in one third of patients and defines the rhabdoid tumors predisposition syndrome. Penetrance is almost complete and the vast majority of germline alterations of SMARCB1 are acquired de novo but rare familial cases with a healthy carrier have also been described. Since the advent of more sensitive molecular analysis technologies such as next-generation sequencing (NGS), the number of mosaicisms of genes involved in genetic diseases discovered from blood samples has increased considerably. The aim of our study was to explore the mosaicisms of SMARCB1 in the blood 1/ of children with rhabdoid tumors with at least one alteration of SMARCB1 previously identified in the tumor but not found in the blood with old-fashioned low-sensitivity technologies and 2/ in parents of children with heterozygous germline alteration of SMARCB1. We analyzed a custom NGS panel which covers the SMARCB1 gene with an average depth of 1.500X on blood samples of 111 children with rhabdoid tumors and 32 parents collected at the Institut Curie since 1999. The mosaicism rate found in index cases was 11.7% (13/111) and 3.1% (1/32) in parents. The variant allele frequency vary from 0.8% to 12.9%. Our results also indicate to be cautious about the possible confounding effect of circulating tumor DNA. This hitherto underestimated SMARCB1 mosaicism rate should motivate an optimization of the genetic counseling as well as the oncological monitoring of these children and thus have a significant medical impact given the catastrophic prognosis of rhabdoid tumors.
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Affiliation(s)
| | | | - Noémie Rybak
- Oncogenetic department, Institut Curie , Paris , France
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Chaussade A, Millot G, Wells C, Brisse H, Laé M, Savignoni A, Desjardins L, Dendale R, Doz F, Aerts I, Jimenez I, Cassoux N, Stoppa Lyonnet D, Gauthier Villars M, Houdayer C. Correlation between RB1germline mutations and second primary malignancies in hereditary retinoblastoma patients treated with external beam radiotherapy. Eur J Med Genet 2019; 62:217-223. [DOI: 10.1016/j.ejmg.2018.07.017] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2018] [Revised: 06/21/2018] [Accepted: 07/17/2018] [Indexed: 11/16/2022]
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