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- W4240068145 abstract "Abstract Background Isolated sulfite oxidase deficiency (ISOD) is the rarest types of life-threatening neurometabolic disorders characterized by neonatal intractable seizures and severe developmental delay with an autosomal recessive mode of inheritance. ISOD is extremely rare and only 29 mutations have been identified and reported worldwide. Germline mutation in SUOX gene causes ISOD. Methods Here, we investigated a 5-days old Chinese girl, presented with intermittent tremor or seizures of limbs, neonatal encephalopathy, subarachnoid cyst and haemorrhage, dysplasia of corpus callosum, neonatal convulsion, respiratory failure, cardiac failure, hyperlactatemia, severe metabolic acidosis, hyperglycemia, hyperkalemia, moderate anemia, atrioventricular block and complete right bundle branch block. Karyotype and chromosomal microarray analysis were performed and identified no chromosomal abnormalities in the proband. Whole exome sequencing was performed for the proband. Sanger sequencing was performed for the proband and her family members. Results Whole exome sequencing identified a novel heterozygous deletion (c.1406_1421delCCTGGCAGGTGGCTAA) and a previously reported heterozygous substitution (c.1200C>G) in exon 6 of the SUOX gene in the proband. The novel heterozygous deletion leads to frameshift (p.Thr469Serfs*20) which results into the formation of a truncated sulfite oxidase of 488 amino acids. The substitution leads to a premature stop codon (p.Tyr400*) followed by the formation of a truncated sulfite oxidase of 399 amino acids. Hence, both the variants are loss-of-function variants. The proband’s father and mother is carrying the substitution and deletion in a heterozygous state respectively. These two variants were not identified in the elder brother of the proband as well as in the 100 healthy individuals. Conclusion Here, we reported the first variant of SUOX gene associated ISOD in Chinese population. Our study not only expand the mutational spectrum of SUOX gene associated ISOD, but also strongly suggested the application of whole exome sequencing for identifying the novel disease-causing mutation in candidate genes." @default.
- W4240068145 created "2022-05-12" @default.
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- W4240068145 date "2020-10-19" @default.
- W4240068145 modified "2023-10-16" @default.
- W4240068145 title "Whole exome sequencing identified novel mutation in SUOX gene causes extremely rare autosomal recessive isolated sulfite oxidase deficiency" @default.
- W4240068145 doi "https://doi.org/10.21203/rs.3.rs-90427/v1" @default.
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