The GJB1 gene sequence was screened for the DNA variants using two approaches i.e., single-strand conformation polymorphism analysis (SSCP) and heteroduplex analysis (HA). The PCR products, obtained by both methods, were separated on a 9% PR-171 research buy acrylamide gel (37.5:1 acrylamide/bisacrylamide). The gels were silver-stained and dried (Fig. ​(Fig.3A3A).

Figure 3a SSCP analysis. An altered migration pattern of PCR products corresponding to exon 2 of GJB1 gene. Lanes 1, 2: proband (heterozygous) and her Inhibitors,research,lifescience,medical son (hemizygous), respectively; lanes 3-10,- healthy controls (lanes 6,8 : healthy females; lanes: 3, 4, 5, 7, … The PCR products showing an anomalous pattern of DNA migration were sequenced using a BigDyeTM Terminator Version 3.1 Ready Reaction Cycle Sequencing kit on the ABI 3730/xl Genetic analyzer (Applied Biosystems, Poland). The GJB1 gene Inhibitors,research,lifescience,medical sequence was analyzed by comparing it with reference sequences “type”:”entrez-nucleotide”,”attrs”:”text”:”NM_001097642.1″,”term_id”:”148233401″,”term_text”:”NM_001097642.1″NM_001097642.1 (transcript variant 1) and “type”:”entrez-nucleotide”,”attrs”:”text”:”NM_000166.4″,”term_id”:”148223887″,”term_text”:”NM_000166.4″NM_000166.4 (transcript variant 2) in the Basic Local

Alignment Search Tool (Blast NCBI – http://blast.ncbi.nlm.nih.gov/Blast.cgi). The sequencing of exon 2 of the GJB1 gene revealed Inhibitors,research,lifescience,medical a hemi-zygous T to G transversion at nucleotide 535 of the GJB1 gene, resulting (by conceptual translation) in a substitution of cysteine with glycine at codon 179 of the Cx32 protein (Fig. ​(Fig.3B3B). Figure 3b Sequence analysis of GJB1 gene. A: Inhibitors,research,lifescience,medical GJB1 gene sequence in a healthy individual as control. B: c.535 T > G heterozygous substitution in proband, indicated with arrow. To confirm the presence of the c.535 T > G substitution, a restriction fragment length polymorphism (RFLP) analysis with CviKI-1 (New England BioLabs, (UK) Ltd. 75/77 Knowl Piece, Wilbury Inhibitors,research,lifescience,medical Way Hitchin, Herts. SG4 0TY,United Kingdom), was

performed according to the manufacturer’s instructions. The digested PCR products were separated on a 10% found acrylamide gel stained with ethidium bromide, and visualized using UV light (data not shown). Discussion The present data refer to a five-generation CMT1X family of Polish origin, in which a novel Cys179 Gly mutation was identified in the proband (IV:7), and in her son. Till now, two other substitutions (Cys179Arg and Cys179Tyr) have been reported in codon 179 of the Cx32 protein. However as no clinical or electrophysiological findings were given for them, it was impossible to compare our patients with the CMT1X phenotype associated with these two mutations (9, 10). The phenotype of the CMT1X family here described is typical, the location of Cys179Gly mutation occurring within a highly-conservative CysX4CysX5Cys motif of the second extra-cellular loop of the Cx32 protein.