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Targeted deep sequencing identifies rare loss-of-function variants in IFNGR1 for risk of atopic dermatitis complicated by eczema herpeticum  Li Gao, MD,

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Presentation on theme: "Targeted deep sequencing identifies rare loss-of-function variants in IFNGR1 for risk of atopic dermatitis complicated by eczema herpeticum  Li Gao, MD,"— Presentation transcript:

1 Targeted deep sequencing identifies rare loss-of-function variants in IFNGR1 for risk of atopic dermatitis complicated by eczema herpeticum  Li Gao, MD, PhD, Lianghua Bin, PhD, Nicholas M. Rafaels, MS, Lili Huang, MS, Joseph Potee, MS, Ingo Ruczinski, PhD, Terri H. Beaty, PhD, Amy S. Paller, MD, Lynda C. Schneider, MD, Rich Gallo, MD, PhD, Jon M. Hanifin, MD, Lisa A. Beck, MD, Raif S. Geha, MD, Rasika A. Mathias, ScD, Kathleen C. Barnes, PhD, Donald Y.M. Leung, MD, PhD  Journal of Allergy and Clinical Immunology  Volume 136, Issue 6, Pages (December 2015) DOI: /j.jaci Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions

2 Fig 1 A, Combined site-frequency spectrum of patients with ADEH+ and patients with ADEH− for the 4 interferon pathway genes. B, Proportions of all variants identified in the 4 interferon pathway genes according to major functional categories. C and D, Proportions of variants identified in patients with ADEH+ (Fig 1, C) and those with ADEH− (Fig 1, D). SNV, Single nucleotide variant. Journal of Allergy and Clinical Immunology  , DOI: ( /j.jaci ) Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions

3 Fig 2 Schematic presentation of 6 rare missense variants in IFNGR1. Top, Variations identified by means of targeted sequencing are shown with allele frequencies (in patients with ADEH+/ADEH−). Three known functional variations are highlighted in boldface, and 2 novel variants are shown in red. Bottom, Various domain and 7 exons in the 5′ to 3′ direction are indicated. JAK1, Janus kinase 1; SP, signal peptide; TM, transmembrane domain. Journal of Allergy and Clinical Immunology  , DOI: ( /j.jaci ) Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions

4 Fig 3 Single-marker and haplotype association tests for European American subjects and ENCODE regulation tracks on the IFNGR1 region (chromosome 6: 137,516, ,542,567). Single nucleotide variants identified by means of targeted sequencing significantly associated with the ADEH+ phenotype (P < .01) are shown (top panel). The y-axis indicates the value of −log10 (P), and the x-axis indicates the relative position for each single nucleotide variant locus in IFNGR1 (3′ to 5′ direction). Vertical lines (green for intron, red for coding nonsynonymous, purple for coding synonymous, grey for near gene 5, and blue for UTR-5) represent the position of each single nucleotide variant on the x-axis, and the height of the line on the y-axis indicates the −log10 value (P). Similarly, the most significant haplotype results from 2- to 7-marker windows across the IFNGR1 gene are also illustrated by horizontal lines in black (although red was used for the 7-SNP window), and a P value cutoff of .05 is depicted by the gray horizontal line. The bottom panel illustrates the IFNGR1 structure, position of 7 single nucleotide variants within IFNGR1 gene region (User Track), and regulatory regions with ENCODE regulation tracks, including UCSC Gene (IFNGR1), DNase Clusters, transcription factor ChIP-seq, layered H3K27Ac, and transcription levels on 3 cell lines (normal human lung fibroblasts in pink, normal human epidermal keratinocytes in purple, and K562 cells in blue). Journal of Allergy and Clinical Immunology  , DOI: ( /j.jaci ) Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions

5 Fig 4 Reduced GAS activation by IFNGR1V14M and IFNGR1Y397C variants. Plasmids of empty vector, IFNGR1WT, IFNGR1V14M, IFNGR1Y397C, and IFNGR1V14MY397C were cotransfected with GAS luciferase reporter plasmids into 293FT cells overnight. A portion of cells were stimulated with IFN-γ (10 ng/mL) for an additional 6 hours. The upper panel shows the luciferase intensity of the GAS reporter, and the lower panel shows receptor levels corresponding to samples shown in the upper panel. This is the representative result of 3 independent experiments. Journal of Allergy and Clinical Immunology  , DOI: ( /j.jaci ) Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions

6 Fig 5 IFN-γ–induced phosphorylation of STAT1 is reduced in IFNGR1(−/−) cells. EBV cells were reconstituted with IFNGR1V14M and IFNGR1Y397C variants. Plasmids of IFNGR1WT, IFNGR1V14M, IFNGR1Y397C, and IFNGR1V14MY397C were transfected into IFNGR1-deficient cells. The cells were then stimulated with recombinant human IFN-γ at concentrations of 0, 10, and 50 ng/mL for 30 minutes. One hundred micrograms of protein per lane was loaded for detection of pSTAT1, STAT1, and IFNGR1 WT and mutants. Journal of Allergy and Clinical Immunology  , DOI: ( /j.jaci ) Copyright © 2015 American Academy of Allergy, Asthma & Immunology Terms and Conditions

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