Table 1

Common variants of each variant type of α-thalassemia.

Gene	Variant type	Common variant	Effect
α-globin gene	--/	--^SEA, --^MED, --^FIL	α⁰
	-α/	-α^3.7 and -α^4.2	α⁺
	α^Tα/	α^IVS1(-5nt)α, α^PA(AATAAG)α, α^CSα	α⁺
	αα^T/	HBA1: c.223G>C (Hb^Q-Thailand)	α⁺