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- W2890723161 abstract "Abstract Very long‐chain acyl‐CoA dehydrogenase deficiency (VLCADD) is the most common defect of mitochondrial β‐oxidation of long‐chain fatty acids. However, the unambiguous diagnosis of true VLCADD patients may be challenging, and a high rate of false positive individuals identified by newborn screening undergo confirmation diagnostics. In this study, we show the outcome of enzyme testing in lymphocytes as a confirmatory tool in newborns identified by screening, and the correlation with molecular sequencing of the ACADVL gene. From April 2013 to March 2017, in 403 individuals with characteristic acylcarnitine profiles indicative of VLCADD, palmitoyl‐CoA oxidation was measured followed by molecular genetic analysis in most of the patients with residual activity (RA) <50%. In almost 50% of the samples (209/403) the RA was >50%, one‐third of the individuals (125/403) displayed a RA of 30–50% and 69/403 individuals showed a residual activity of 0–30%. Sequencing of the ACADVL gene revealed that all individuals with activities below 24% were true VLCADD patients, individuals with residual activities between 24 and 27% carried either one or two mutations. Twenty new mutations could be identified and functionally classified based on their effect on enzyme function. Finally, we observed an up‐regulation of MCAD‐activity in many patients. However, this did not correlate with the degree of VLCAD RA. Although the likely clinical phenotype cannot be fully foreseen by genetic and functional tests as it depends on many factors, our data demonstrate the strength of this functional enzyme test in lymphocytes as a quick and reliable method for confirmation diagnostics of VLCADD." @default.
- W2890723161 created "2018-09-27" @default.
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- W2890723161 date "2018-09-07" @default.
- W2890723161 modified "2023-10-05" @default.
- W2890723161 title "The diagnostic challenge in very-long chain acyl-CoA dehydrogenase deficiency (VLCADD)" @default.
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- W2890723161 doi "https://doi.org/10.1007/s10545-018-0245-5" @default.
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