Ahmadloo S, Talebi S, Miryounesi M, Pasalar P, Keramatipour M. Functional Analysis of A Novel Splicing Mutation in The Mutase Gene of Two Unrelated Pedigrees.
Cell J 2016;
18:397-404. [PMID:
27602322 PMCID:
PMC5011328 DOI:
10.22074/cellj.2016.4568]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2015] [Accepted: 11/22/2015] [Indexed: 01/04/2023]
Abstract
Objective
Methylmalonic acidura (MMA) is a rare autosomal recessive inborn error of
metabolism. In this study we present a novel nucleotide change in the mutase (MUT)
gene of two unrelated Iranian pedigrees and introduce the methods used for its functional
analysis.
Materials and Methods
Two probands with definite diagnosis of MMA and a common
novel variant in the MUT were included in a descriptive study. Bioinformatic prediction of
the splicing variant was done with different prediction servers. Reverse transcriptionpolymerase
chain reaction (RT-PCR) was done for splicing analysis and the products were
analyzed by sequencing.
Results
The included index patients showed elevated levels of propionylcarnitine (C3).
Urine organic acid analysis confirmed the diagnosis of MMA, and screening for mutations in the MUT revealed a novel C to G variation at the 3´ splice acceptor site in intron
12. In silico analysis suggested the change as a mutation in a conserved sequence. The
splicing analysis showed that the C to G nucleotide change at position -3 in the acceptor
splice site can lead to retention of the intron 12 sequence.
Conclusion
This is the first report of a mutation at the position -3 in the MUT intron
12 (c.2125-3C>G). The results suggest that the identified variation can be associated
with the typical clinical manifestations of MMA.
Collapse