The expression of DNA mismatch repair (DMMR) genes in patients with maturation arrest (MA) was analyzed. Samples were subjected to mutL homolog 3 (MLH3) mutation analysis by denaturing high-performance liquid chromatography/sequencing and quantification of MMR expression in testicular tissue by real-time polymerase chain reaction (PCR). Microsatellite instability assays were negative. Two missense and 1 intronic mutations were found. The missense mutation 2531C/T (P844 L), predicted to affect MLH3 function, was found in 3 MA cases in association with the intronic variant IVS9 + 66G/A. Relative messenger RNA (mRNA) quantification identified 2 patients who overexpressed MLH3, 1 of them also overexpressing mutL homolog 1 (MLH1). The latter also presented the 2531C/T-IVS9 + 66G/A mutation. In conclusion, we suggest that a predominance of MLH3 expression might favor the MLH1/MLH3 complex which then would compete with the MLH1/PMS2 complexes. This could convey disruption of the relative stoichiometry between MLH1/MLH3 and MLH1/PMS2 complexes, thus causing meiosis failure, as MLH1/PMS2 complexes are supposed to replace MLH1/MLH3 during diplonema.
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Ferrás, C., Fernandes, S., Silva, J. et al. Expression Analysis of MLH3, MLH1, and MSH4 in Maturation Arrest. Reprod. Sci. 19, 587–596 (2012) doi:10.1177/1933719111428521
- expression analysis
- human meiosis
- maturation arrest
- MMR genes