학술논문

Assessment of a novel variation in DHODH gene causing Miller syndrome: The first report in Chinese population
Document Type
article
Source
Molecular Genetics & Genomic Medicine, Vol 11, Iss 7, Pp n/a-n/a (2023)
Subject
acrofacial dysostosis
DHODH gene
Miller syndrome
whole exome sequencing
Genetics
QH426-470
Language
English
ISSN
2324-9269
Abstract
Abstract Background Miller syndrome is a rare type of postaxial acrofacial dysostosis caused by biallelic mutations in the DHODH gene, which is characterized mainly by craniofacial malformations of micrognathia, orofacial clefts, cup‐shaped ears, and malar hypoplasia, combined with postaxial limb deformities like the absence of fifth digits. Methods In this study, a prenatal case with multiple orofacial‐limb abnormities was enrolled, and a thorough clinical and imaging examination was performed. Subsequently, genetic detection with karyotyping, chromosomal microarray analysis (CMA) and whole‐exome sequencing (WES) was carried out. In vitro splicing analysis was also conducted to clarify the impact of one novel variant. Results The affected fetus displayed typical manifestations of Miller syndrome, and WES identified a diagnostic compound heterozygous variation in DHODH, consisting of two variants: exon(1‐3)del and c.819 + 5G > A. We conducted a further in vitro validation with minigene system, and the result indicated that the c.819 + 5G > A variant would lead to an exon skipping in mRNA splicing. Conclusions These findings provided with the first exonic deletion and first splice site variant in DHODH, which expanded the mutation spectrum of Miller syndrome and offered reliable evidence for genetic counseling to the affected family.