Mutational analysis of Peroxiredoxin IV: exclusion of a positional candidate for multinodular goitre

Mutational analysis of Peroxiredoxin IV: exclusion of a positional candidate for multinodular goitre

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Abstract Background Multinodular goitre (MNG) is a common disorder characterised by an enlargement of the thyroid, occurring as a compensatory response to hormonogenesis impairment.The incidence of MNG is dependent on sex (female:male ratio 5:1) and several reports have documented a genetic basis for the disease.Last year we mapped a MNG locus to chromosome 15-eg1053cl Xp22 in a region containing the peroxiredoxin IV (Prx-IV) gene.Since Prx-IV is involved in the removal of H2O2 in thyroid cells, we hypothesize that mutations in Prx-IV gene are involved in pathogenesis of MNG.Methods Four individuals (2 affected, 2 unrelated unaffected) were sequenced using automated methods.

All individuals were originated from the original three-generation Italian family described in previous studies.A Southern blot analysis using a Prx-IV full-length cDNA as a probe was performed in order to exclude genomic rearrangements and/or intronic mutations.In addition a RT-PCR of PRX-IV was performed rawafricaonline.com in order to investigate expression alterations.Results No causative mutations were found.Two adjacent nucleotide substitutions were detected within introns 1 and 4.

These changes were also detected in unaffected individuals, suggesting that they were innocuous polymorphisms.No gross genomic rearrangements and/or restriction fragment alterations were observed on Southern analysis.Finally, using RT-PCR from tissue-specific RNA, no differences of PRX-IV expression-levels were detected between affected and unaffected samples.Conclusions Based on sequence and genomic analysis, Prx-IV is very unlikely to be the MNG2 gene.