A Dominantly Inherited 5′ UTR Variant Causing Methylation-Associated Silencing of BRCA1 as a Cause of Breast and Ovarian Cancer D.Gareth R. Evans, Elke.

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Date of download: 5/28/2016 Copyright © 2016 American Medical Association. All rights reserved. From: Increased BDNF Promoter Methylation in the Wernicke.

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A Dominantly Inherited 5′ UTR Variant Causing Methylation-Associated Silencing of BRCA1 as a Cause of Breast and Ovarian Cancer D.Gareth R. Evans, Elke M. van Veen, Helen J. Byers, Andrew J. Wallace, Jamie M. Ellingford, Glenda Beaman, Javier Santoyo-Lopez, Timothy J. Aitman, Diana M. Eccles, Fiona I. Lalloo, Miriam J. Smith, William G. Newman The American Journal of Human Genetics Volume 103, Issue 2, Pages 213-220 (August 2018) DOI: 10.1016/j.ajhg.2018.07.002 Copyright © 2018 The Authors Terms and Conditions

Figure 1 Pedigrees of Families Carrying the 5′ UTR BRCA1 Variant Pedigrees of family 1 (A) and 2 (B). Abbreviations are as follows: Y, age (in years) tested; uMe, unmethylated BRCA1 promoter; Me, methylated BRCA1 promoter; WT, wild-type; and NT, not tested. Arrows indicate probands. The American Journal of Human Genetics 2018 103, 213-220DOI: (10.1016/j.ajhg.2018.07.002) Copyright © 2018 The Authors Terms and Conditions

Figure 2 Methylation Analysis of BRCA1 Promoter Region (A) Schematic overview of BRCA1 promoter region (black dots, CpG sites; blue star, c.−107; green dot, rs799905; arrows, primer locations for clonal bisulfite sequencing; dotted lines, pyrosequencing regions [A and B]). (B and C) Representative pyrograms (region B) show the level of BRCA1 promoter methylation in lymphocytes, buccal mucosa, and hair-derived DNA of an affected and unaffected individual. Five CpGs and a control site (0%) (to ensure complete bisulfite conversion) are shaded, and the level of methylation as a ratio of C:T peak heights is calculated at each site (representing methylated versus unmethylated cytosine). (B) Affected individual II-4 from family 1. (C) Unaffected individual II-1 from family 1. Further pyrogram data (region A) indicating methylation across the BRCA1 promoter are available in Figure S1. (D) Schematic overview of clonal bisulfite sequencing results. Allelic discrimination is made on the basis of rs799905 C>G (orange, C; green, G). The variant c.−107A>T is present on the methylated allele (yellow, A; blue, T; black, methylated; white, unmethylated). The American Journal of Human Genetics 2018 103, 213-220DOI: (10.1016/j.ajhg.2018.07.002) Copyright © 2018 The Authors Terms and Conditions

Figure 3 DNA and RNA Analysis of BRCA1 (A) Representative Sanger sequencing traces demonstrating allelic loss of expression of rs1799917 C>T in exon 11 of BRCA1. In the DNA trace, both the C and T nucleotides are present, whereas in the cDNA trace only the C nucleotide is present. (B) Representative Sanger sequencing traces for the heterozygous c.−107A>T variant, which is present in the individual with a methylated BRCA1 promoter and absent in an individual with an unmethylated promoter. (C) Schematic representation of the normal pattern of gene expression and transcription and abnormal gene expression and transcription caused by a germline variant (c.−107), the latter of which results in hypermethylation of the promoter (secondary epimutation) and silencing of one allele. The American Journal of Human Genetics 2018 103, 213-220DOI: (10.1016/j.ajhg.2018.07.002) Copyright © 2018 The Authors Terms and Conditions