PCR-based diagnosis of the Filipino (??FIL) and Thai (??THAI) ?-thalassemia-1 deletions
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In southeast Asia, the carrier frequency of two-gene alpha-thalassemia deletions is quite high, ranging from 4% to 14% depending on the population. The most common alpha-thalassemia-1 deletion is the so-called southeast Asian deletion (--(SEA)). In addition, a significant proportion of cases involve two other deletions, the Filipino (--(FIL)) and Thai (--(THAI)) deletions. In this report, we identify the deletion breakpoints for the (--(FIL)) and (--(THAI)) deletions, and describe PCR-based protocols for rapid and reliable DNA diagnosis of these deletions.
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