alexa A rapid multifluorescent polymerase chain reaction for genetic counselling in Chinese haemophilia A families.
Genetics & Molecular Biology

Genetics & Molecular Biology

Journal of Genetic Syndromes & Gene Therapy

Author(s): Fang Y, Wang XF, Dai J, Wang HL

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Abstract Linkage analysis is a widely used strategy for genetic counselling in haemophilia A (HA) families. We attempted to develop more informative markers closely linked to factor VIII (FVIII) gene and establish a rapid multifluorescent polymerase chain reaction (PCR) method with these markers. Five extragenic (DXS15, DXS9901, G6PD, DXS1073 and DXS1108) and one intragenic (F8Civs13) markers were examined in 118 healthy individuals and 12 HA families which had been diagnosed before. Five extragenic markers were within an interval of about 1.5 Mb to FVIII gene and located on each side of the gene. The expected heterozygote rate (HR) of DXS15, DXS9901, G6PD, DXS1073, DXS1108 and F8Civs13 were 74.97\%, 79.77\%, 56.06\%, 59.92\%, 39.97\% and 47.61\%, while the observed HR were 88.24\%, 82.35\%, 21.57\%, 62.75\%, 35.29\% and 52.94\%. When six polymorphic markers were combined together, all the studied females were informative in at least one of these markers and 29.41\% of them were detected informative in three markers with the highest frequency. The diagnostic rates of DXS15, DXS9901, G6PD, DXS1073, DXS1108 and F8Civs13 in 12 haemophilia families were 75.00\%, 91.67\%, 41.67\%, 75.00\%, 33.33\% and 66.67\% respectively. All the genetic diagnosis was consistent with the result we analysed before and no recombination was observed. Family 1 was given as an example in this study and was found to be informative in three polymorphic markers DXS15, DXS9901 and DXS1073. The patient's sister was detected the same allele as the proband, but her male fetus did not inherit the affected allele from her, which was consistent with the result of sequencing. It was demonstrated that the multifluorescent PCR method established in this study was convenient and efficient and can be applied to carrier detection and prenatal diagnosis in HA families. This article was published in Haemophilia and referenced in Journal of Genetic Syndromes & Gene Therapy

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