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Simple molecular diagnostic method for Fragile X syndrome in Egyptian patients: Pilot study

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Meguid N., Ismail M., El-Mahdy R., Barakat M., El-Awady M.

Acta Biochimica Polonica

2014

vol. 61

issue 2

259-263

Background: Poor knowledge about Fragile X syndrome (FXS) may be a major barrier to early diagnosis that could improve quality of life and prognosis especially in the developing countries. Aim: The aim of this study was to evaluate simple and reproducible method for premutation detection in females of fragile X families for the first time in Egypt. Subjects and Methods: We have developed a rapid modified polymerase chain reaction (PCR)-based screening tool for expanded Fragile X mental retardation 1 (FMR1) alleles. This method utilizes betaine as additive to facilitate FMR 1 gene amplification. We screened fifty three males, thirty two first-degree females; twenty normal healthy controls in addition to six reference samples. Results: Simple PCR method showed 16 males with abnormal CGG repeats, where 10 of their mothers and four sisters had FMR 1 premutation. Consanguineous marriage was present in 66.6% percent of the studied families. Studying the correlation between genotype and clinical manifestations showed premature ovarian failure in 40% and learning disability in 50% of the studied female carriers. Conclusion: FXS has to be ruled out in families with consanguineous parents, before assuming that familial mental retardation is due to autosomal recessive gene defects. Early carrier detection may reduce the number of affected children. In conclusion, more studies are still needed of much larger sample size with known allele sizes in order to guarantee the accuracy of the method used.

Methylenetetrahydrofolate reductase gene polymorphisms in Egyptian Turner Syndrome patients

100%

Ismail M., Zarouk W., Ruby M., Mahmoud W., Gad R.

Acta Biochimica Polonica

2015

vol. 62

issue 3

529-532

Background: Folate metabolism dysfunctions can result in DNA hypomethylation and abnormal chromosome segregation. Two common polymorphisms of the methylenetetrahydrofolate reductase (MTHFR) encoding gene (C677T and A1298C) reduce MTHFR activity, but when associated with aneuploidy, the results are conflicting. Turner Syndrome (TS) is an interesting model for investigating the association between MTHFR gene polymorphisms and nondisjunction because of the high frequency of chromosomal mosaicism in this syndrome. Objective: To investigate the association of MTHFR gene C677T and A1298C polymorphisms in TS patients and their mothers and to correlate these polymorphisms with maternal risk of TS offspring. Subjects and Methods: MTHFR C677T and A1298C polymorphisms were genotyped in 33 TS patients, their mothers and 15 healthy females with their mothers as controls using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and sequencing technique. Results: Genotype and allele frequencies of both C677T and A1298C were not significantly different between TS cases and controls. There were no significant differences in C677T genotype distribution between the TS mothers and controls (p=1). The MTHFR 1298AA and 1298AC genotypes were significantly increased in TS mothers Vs. control mothers (p=0.002). The C allele frequency of the A1298C polymorphism was significantly different between the TS mothers and controls (p=0.02). The association of A1298C gene polymorphism in TS patients was found to increase with increasing age of both mothers (p=0.026) and fathers (p=0.044) of TS cases. Conclusion: Our findings suggest a strong association between maternal MTHFR A1298C and risk of TS in Egypt.

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2 Acta Biochimica Polonica

1 2015

1 2014

2 Ismail M.

1 Barakat M.

1 El-Awady M.

1 El-Mahdy R.

1 Gad R.

1 Mahmoud W.

1 Meguid N.

1 Ruby M.

1 Zarouk W.

Search results

Simple molecular diagnostic method for Fragile X syndrome in Egyptian patients: Pilot study

Methylenetetrahydrofolate reductase gene polymorphisms in Egyptian Turner Syndrome patients