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- W4281778384 abstract "To identify the missing heritability of ABCA4-related retinopathy in a Chinese cohort.We recruited 33 unrelated patients with ABCA4-related retinopathy carrying a monoallelic variant in ABCA4. All patients underwent ophthalmic examinations. Next-generation sequencing of the whole ABCA4 sequence, including coding and noncoding regions, was performed to detect deep intronic variants (DIVs) and copy number variations (CNVs).We identified eight missing pathogenic ABCA4 variants in 60.6% of the patients (20/33), which comprised five DIVs and three CNVs. The five DIVs, including four novel (c.1555-816T>G, c.2919-169T>G, c.2919-884G>T, and c.5461-1321A>G) and one reported (c.4539+1100A>G), accounted for the missing alleles in 51.5% of the patients. Minigene assays showed that four novel DIVs activated cryptic splice sites leading to the insertions of pseudoexons. The three novel CNVs consisted of one gross deletion of 1273 bp (exon 2) and two gross duplications covering 25.2 kb (exons 28-43) and 9.4 kb (exons 38-44). The microhomology domains were identified at the breakpoints and revealed the potential mechanisms of CNV formation.DIVs and CNVs explained approximately two-thirds of the unresolved Chinese cases with ABCA4-related retinopathy. Combining results from phenotypic-directed screening, targeting the whole ABCA4 sequencing and in silico tools can help to identify the missing heritability." @default.
- W4281778384 created "2022-06-13" @default.
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- W4281778384 date "2022-06-03" @default.
- W4281778384 modified "2023-10-05" @default.
- W4281778384 title "Phenotype-Based Genetic Analysis Reveals Missing Heritability of <i>ABCA4</i>-Related Retinopathy: Deep Intronic Variants and Copy Number Variations" @default.
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- W4281778384 doi "https://doi.org/10.1167/iovs.63.6.5" @default.
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