Iridocorneal endothelial (ICE) syndrome is a rare, irreversibly blinding eye diseasewith an unknown etiology. Understanding its genomic and epigenomic landscape could aid indeveloping etiology-based therapies. In this...Iridocorneal endothelial (ICE) syndrome is a rare, irreversibly blinding eye diseasewith an unknown etiology. Understanding its genomic and epigenomic landscape could aid indeveloping etiology-based therapies. In this study, we recruited 99 ICE patients and performedwhole-genome sequencing (WGS) on 51 and genome-wide DNA methylation profiling on 48 ofthem. We conducted mutational burden testing on genes and noncoding regulatory regions,comparing the ICE cohort with control groups (9197 East Asians from the gnomAD databaseand 350 normal Chinese from our in-house cohort). Copy number variation (CNV) analysisand differential methylation of regions were also explored. We identified RP1L1 (27/51,53%) with a significantly higher coding-altering mutational burden in the ICE cohort (p <8.3×10^(7)), with mutations predominantly at chr8:10467637 (hg19). Additionally, 41 regionswith significant CNVs were identified, including two regions at chr19:15783859-15791329(hg19) and chr3:75786061-75790887 (hg19), showing copy number loss in 39 and 19 patients,respectively. We also identified 2,717 differentially methylated regions (DMRs), with hypomethylation prevalent in ICE syndrome (91.9% of DMRs). Among these, 45 recurrent hypomethylated regions (HMRs) in more than 10% of ICE patients showed differential methylationcompared to normal controls. This study presents the first comprehensive genomic and epigenomic characterization of ICE syndrome, offering insights into its underlying etiology.展开更多
基金supported by the National Key Research and Development Program of China(No.2022YFC2502800)the National Natural Science Foundation of China(No.82070955,32000537).
文摘Iridocorneal endothelial (ICE) syndrome is a rare, irreversibly blinding eye diseasewith an unknown etiology. Understanding its genomic and epigenomic landscape could aid indeveloping etiology-based therapies. In this study, we recruited 99 ICE patients and performedwhole-genome sequencing (WGS) on 51 and genome-wide DNA methylation profiling on 48 ofthem. We conducted mutational burden testing on genes and noncoding regulatory regions,comparing the ICE cohort with control groups (9197 East Asians from the gnomAD databaseand 350 normal Chinese from our in-house cohort). Copy number variation (CNV) analysisand differential methylation of regions were also explored. We identified RP1L1 (27/51,53%) with a significantly higher coding-altering mutational burden in the ICE cohort (p <8.3×10^(7)), with mutations predominantly at chr8:10467637 (hg19). Additionally, 41 regionswith significant CNVs were identified, including two regions at chr19:15783859-15791329(hg19) and chr3:75786061-75790887 (hg19), showing copy number loss in 39 and 19 patients,respectively. We also identified 2,717 differentially methylated regions (DMRs), with hypomethylation prevalent in ICE syndrome (91.9% of DMRs). Among these, 45 recurrent hypomethylated regions (HMRs) in more than 10% of ICE patients showed differential methylationcompared to normal controls. This study presents the first comprehensive genomic and epigenomic characterization of ICE syndrome, offering insights into its underlying etiology.
