Molecular characterization of 22 novel UDP-N-acetylglucosamine-1-phosphate transferase α- and β-subunit (GNPTAB) gene mutations causing mucolipidosis types IIα/β and IIIα/β in 46 patients

Tappino, Barbara, Chuzhanova, Nadia A., Regis, Stefano, Dardis, Andrea, Corsolini, Fabio, Stroppiano, Marina, Tonoli, Emmanuel, Beccari, Tommaso, Rosano, Camillo, Mucha, Jan, Blanco, Mariana, Szlago, Marina, Di Rocco, Maja, Cooper, David Neil ORCID: https://orcid.org/0000-0002-8943-8484 and Filocamo, Mirella 2009. Molecular characterization of 22 novel UDP-N-acetylglucosamine-1-phosphate transferase α- and β-subunit (GNPTAB) gene mutations causing mucolipidosis types IIα/β and IIIα/β in 46 patients. Human Mutation 30 (11) , E956-E973. 10.1002/humu.21099

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Abstract

Mutational analysis of the GNPTAB gene was performed in 46 apparently unrelated patients with mucolipidosis IIα/β or IIIα/β, characterized by the mistargeting of multiple lysosomal enzymes as a consequence of a UDP-GlcNAc-1-phosphotransferase defect. The GNPTAB mutational spectrum comprised 25 distinct mutant alleles, 22 of which were novel, including 3 nonsense mutations (p.Q314X, p.R375X, p.Q507X), 5 missense mutations (p.I403T, p.C442Y, p.C461G, p.Q926P, p.L1001P), 6 microduplications (c.749dupA, c.857dupA, c.1191_1194dupGCTG, c.1206dupT, c.1331dupG, c.2220_2221dupGA) and 8 microdeletions (c.755_759delCCTCT, c.1399delG, c.1959_1962delTAGT, c.1965delC, c.2550_2554delGAAAA, c.3443_3446delTTTG, c.3487_3490delACAG, c.3523_3529delATGTTCC). All micro-duplications/deletions were predicted to result in the premature termination of translation. A novel exonic SNP (c.303G>A; E101E) was identified which is predicted to create an SFRS1 (SF2/ASF) binding site that may be of potential functional/clinical relevance. This study of mutations in the GNPTAB gene, the largest yet reported, extends our knowledge of the mutational heterogeneity evident in MLIIα/β/MLIIIα/β.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Medicine
Subjects:	Q Science > QH Natural history > QH426 Genetics
Uncontrolled Keywords:	Mucolipidosis II; Mucolipidosis III; GNPTAB; polymorphisms
Publisher:	Wiley-Blackwell
ISSN:	1059-7794
Last Modified:	19 Oct 2022 09:56
URI:	https://orca.cardiff.ac.uk/id/eprint/22728

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