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Clinical, biochemical and molecular characterization of Korean patients with mucolipidosis II/III and successful prenatal diagnosis

Title
Clinical, biochemical and molecular characterization of Korean patients with mucolipidosis II/III and successful prenatal diagnosis
Author
김영은
Keywords
GNPTAB; Lysosomal storage disease; Mucolipidosis; Prenatal diagnosis
Issue Date
2017-01
Publisher
BIOMED CENTRAL LTD
Citation
ORPHANET JOURNAL OF RARE DISEASES, v. 12, Article no. 11
Abstract
Background: Mucolipidosis types II and III (ML II/III) are autosomal recessive disorders caused by a deficiency in the lysosomal enzyme N-acetylglucosamine-1-phosphotransferase. We investigated the molecular genetic characteristics of the GNPTAB gene, which codes for the alpha/beta subunits of a phosphotransferase, in Korean ML II/III patients. We included prenatal tests and evaluated the spectrum of mutations in East Asian populations with ML II/III through a literature review.Methods: Seven patients from six families were enrolled in the study including two prenatal tests using chorionic villi samples. A diagnosis of ML II/III was made based on clinical findings and increases in serum lysosomal enzyme levels. PCR and direct sequencing were performed to identify GNPTAB mutations.Results: We found 14 mutant alleles including seven known mutations of c.2189delT (p.Leu730fs* 7), c.1090C > T (p.Arg364*), c.2681G > A (p.Trp894*), c.3565C > T (p.Arg1189*), c.310C > T (p.Gln104*), c.1071G > A (p.Trp357*) and c.2574_2575delGA (p.Asn859Glnfs* 2). Four were novel variants of unknown significance: c.992A > G (p.Tyr331Cys), c. 666 T > A (p.Leu889*), c.637-6 T > G (p.Thr213Phefs* 11), and c.471_472delTT (p.Tyr158Serfs* 8). Family studies revealed the probands to be compound heterozygotes. The fetuses carried the same GNPTAB mutations as the mucolipidosis II/III probands in the prenatal diagnosis.Conclusions: We identified GNPTAB mutations in all patients with ML II/III, but did not identify a hot spot in Korean patients. We successfully performed prenatal diagnosis using molecular investigation.
URI
https://ojrd.biomedcentral.com/articles/10.1186/s13023-016-0556-2http://repository.hanyang.ac.kr/handle/20.500.11754/106044
ISSN
1750-1172
DOI
10.1186/s13023-016-0556-2
Appears in Collections:
COLLEGE OF MEDICINE[S](의과대학) > MEDICINE(의학과) > Articles
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