[Importance of 5569G/A polymorphism in intron 4 of HFE gene in the diagnosis of hereditary hemochromatosis].
BACKGROUND
The presence of the 5569A polymorphism may lead to misdiagnosis of patients susceptible of hereditary hemochromatosis (HH). For that reason, samples containing the Cys282Tyr mutation were revised and the frequency of this polymorphism in our environment was assessed.


METHODS
Twenty samples were retested and 56 controls were included. The study was performed by PCR-RFLP.


RESULTS
The diagnosis was confirmed in 8 cases susceptible of error. However, an amplification deficiency of normal alleles was detected in 2 heterozygous (17%). The allelic frequency of the 5569A polymorphism in the control population was 14.3%.


CONCLUSIONS
Although misdiagnosis was not committed, we recommend changing to any primer that does not include the 5569G/A polymorphism in the study of HH.
Román
R
R
BIOPAT, Biopatologia Molecular, Grup Assistència, Hospital de Barcelona, Barcelona, Spain.
Colomer
A
A
Erill
N
N
Puig
X
X
Guix
M
M
D000328:Adult; D004252:DNA Mutational Analysis; D005260:Female; D015870:Gene Expression; D005787:Gene Frequency / Q000235:genetics; D005820:Genetic Testing; D006680:HLA Antigens / Q000235:genetics; D006432:Hemochromatosis / Q000175:diagnosis* / Q000453:epidemiology; D006801:Humans; D007438:Introns / Q000235:genetics*; D008297:Male; D017354:Point Mutation / Q000235:genetics; D011110:Polymorphism, Genetic / Q000235:genetics*; D012350:RNA, Transfer, Cys / Q000235:genetics*; D013030:Spain / Q000453:epidemiology
D006680:HLA Antigens; D012350:RNA, Transfer, Cys