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1. Germline MBD4 deficiency causes a multi-tumor predisposition syndrome

Author

Palles, C, West, HD, Chew, E, Galavotti, S, Flensburg, C, Grolleman, JE, Jansen, EAM, Curley, H, Chegwidden, L, Arbe-Barnes, EH, Lander, N, Truscott, R, Pagan, J, Bajel, A, Sherwood, K, Martin, L, Thomas, H, Georgiou, D, Fostira, F, Goldberg, Y, Adams, DJ, van der Biezen, SAM, Christie, M, Clendenning, M, Thomas, LE, Deltas, C, Dimovski, AJ, Dymerska, D, Lubinski, J, Mahmood, K, van der Post, RS, Sanders, M, Weitz, J, Taylor, JC, Turnbull, C, Vreede, L, van Wezel, T, Whalley, C, Arnedo-Pac, C, Caravagna, G, Cross, W, Chubb, D, Frangou, A, Gruber, AJ, Kinnersley, B, Noyvert, B, Church, D, Graham, T, Houlston, R, Lopez-Bigas, N, Sottoriva, A, Wedge, D, Jenkins, MA, Kuiper, RP, Roberts, AW, Cheadle, JP, Ligtenberg, MJL, Hoogerbrugge, N, Koelzer, VH, Rivas, AD, Winship, IM, Ponte, CR, Buchanan, DD, Power, DG, Green, A, Tomlinson, IPM, Sampson, JR, Majewski, IJ, de Voer, RM, Palles, C, West, HD, Chew, E, Galavotti, S, Flensburg, C, Grolleman, JE, Jansen, EAM, Curley, H, Chegwidden, L, Arbe-Barnes, EH, Lander, N, Truscott, R, Pagan, J, Bajel, A, Sherwood, K, Martin, L, Thomas, H, Georgiou, D, Fostira, F, Goldberg, Y, Adams, DJ, van der Biezen, SAM, Christie, M, Clendenning, M, Thomas, LE, Deltas, C, Dimovski, AJ, Dymerska, D, Lubinski, J, Mahmood, K, van der Post, RS, Sanders, M, Weitz, J, Taylor, JC, Turnbull, C, Vreede, L, van Wezel, T, Whalley, C, Arnedo-Pac, C, Caravagna, G, Cross, W, Chubb, D, Frangou, A, Gruber, AJ, Kinnersley, B, Noyvert, B, Church, D, Graham, T, Houlston, R, Lopez-Bigas, N, Sottoriva, A, Wedge, D, Jenkins, MA, Kuiper, RP, Roberts, AW, Cheadle, JP, Ligtenberg, MJL, Hoogerbrugge, N, Koelzer, VH, Rivas, AD, Winship, IM, Ponte, CR, Buchanan, DD, Power, DG, Green, A, Tomlinson, IPM, Sampson, JR, Majewski, IJ, and de Voer, RM

Abstract

We report an autosomal recessive, multi-organ tumor predisposition syndrome, caused by bi-allelic loss-of-function germline variants in the base excision repair (BER) gene MBD4. We identified five individuals with bi-allelic MBD4 variants within four families and these individuals had a personal and/or family history of adenomatous colorectal polyposis, acute myeloid leukemia, and uveal melanoma. MBD4 encodes a glycosylase involved in repair of G:T mismatches resulting from deamination of 5'-methylcytosine. The colorectal adenomas from MBD4-deficient individuals showed a mutator phenotype attributable to mutational signature SBS1, consistent with the function of MBD4. MBD4-deficient polyps harbored somatic mutations in similar driver genes to sporadic colorectal tumors, although AMER1 mutations were more common and KRAS mutations less frequent. Our findings expand the role of BER deficiencies in tumor predisposition. Inclusion of MBD4 in genetic testing for polyposis and multi-tumor phenotypes is warranted to improve disease management.

Published
2022

2. Lineage skewing and genome instability underlie marrow failure in a zebrafish model of GATA2 deficiency.

Author

Mahony CB, Copper L, Vrljicak P, Noyvert B, Constantinidou C, Browne S, Pan Y, Palles C, Ott S, Higgs MR, and Monteiro R

Subjects
Animals, Bone Marrow Failure Disorders, GATA2 Transcription Factor genetics, GATA2 Transcription Factor metabolism, Genomic Instability, Zebrafish metabolism, Bone Marrow metabolism, GATA2 Deficiency
Abstract

Inherited bone marrow failure associated with heterozygous mutations in GATA2 predisposes toward hematological malignancies, but the mechanisms remain poorly understood. Here, we investigate the mechanistic basis of marrow failure in a zebrafish model of GATA2 deficiency. Single-cell transcriptomics and chromatin accessibility assays reveal that loss of gata2a leads to skewing toward the erythroid lineage at the expense of myeloid cells, associated with loss of cebpa expression and decreased PU.1 and CEBPA transcription factor accessibility in hematopoietic stem and progenitor cells (HSPCs). Furthermore, gata2a mutants show impaired expression of npm1a, the zebrafish NPM1 ortholog. Progressive loss of npm1a in HSPCs is associated with elevated levels of DNA damage in gata2a mutants. Thus, Gata2a maintains myeloid lineage priming through cebpa and protects against genome instability and marrow failure by maintaining expression of npm1a. Our results establish a potential mechanism underlying bone marrow failure in GATA2 deficiency., Competing Interests: Declaration of interests The authors declare no competing interests., (Copyright © 2023 The Author(s). Published by Elsevier Inc. All rights reserved.)

Published
2023
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3. Germline MBD4 deficiency causes a multi-tumor predisposition syndrome.

Author

Palles C, West HD, Chew E, Galavotti S, Flensburg C, Grolleman JE, Jansen EAM, Curley H, Chegwidden L, Arbe-Barnes EH, Lander N, Truscott R, Pagan J, Bajel A, Sherwood K, Martin L, Thomas H, Georgiou D, Fostira F, Goldberg Y, Adams DJ, van der Biezen SAM, Christie M, Clendenning M, Thomas LE, Deltas C, Dimovski AJ, Dymerska D, Lubinski J, Mahmood K, van der Post RS, Sanders M, Weitz J, Taylor JC, Turnbull C, Vreede L, van Wezel T, Whalley C, Arnedo-Pac C, Caravagna G, Cross W, Chubb D, Frangou A, Gruber AJ, Kinnersley B, Noyvert B, Church D, Graham T, Houlston R, Lopez-Bigas N, Sottoriva A, Wedge D, Jenkins MA, Kuiper RP, Roberts AW, Cheadle JP, Ligtenberg MJL, Hoogerbrugge N, Koelzer VH, Rivas AD, Winship IM, Ponte CR, Buchanan DD, Power DG, Green A, Tomlinson IPM, Sampson JR, Majewski IJ, and de Voer RM

Subjects
Endodeoxyribonucleases genetics, Genetic Predisposition to Disease, Germ Cells pathology, Germ-Line Mutation genetics, Humans, Adenomatous Polyposis Coli genetics, Colorectal Neoplasms genetics, Colorectal Neoplasms pathology, Uveal Neoplasms genetics
Abstract

We report an autosomal recessive, multi-organ tumor predisposition syndrome, caused by bi-allelic loss-of-function germline variants in the base excision repair (BER) gene MBD4. We identified five individuals with bi-allelic MBD4 variants within four families and these individuals had a personal and/or family history of adenomatous colorectal polyposis, acute myeloid leukemia, and uveal melanoma. MBD4 encodes a glycosylase involved in repair of G:T mismatches resulting from deamination of 5'-methylcytosine. The colorectal adenomas from MBD4-deficient individuals showed a mutator phenotype attributable to mutational signature SBS1, consistent with the function of MBD4. MBD4-deficient polyps harbored somatic mutations in similar driver genes to sporadic colorectal tumors, although AMER1 mutations were more common and KRAS mutations less frequent. Our findings expand the role of BER deficiencies in tumor predisposition. Inclusion of MBD4 in genetic testing for polyposis and multi-tumor phenotypes is warranted to improve disease management., Competing Interests: Declaration of interests The authors declare no competing interests., (Copyright © 2022 The Author(s). Published by Elsevier Inc. All rights reserved.)

Published
2022
Full Text
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