Table 1.

Summary of human IGγ1 (G1m) allotypes and their associated genotypes (From: http://www.imgt.org).

G1m allotypes		Amino acid positionsa
CH1	CH3	CH1	CH3
		120	12	14
		(97)	(16)	(18)
		214	356	358
G1m17	G1m1	Lys	Asp	Leu
		aAa	gaT	Ctg
G1m3	nG1m1	Arg	Glu	Met
		aGa	gaG	Atg

^aAmino acid numbers (bold) are defined according to IMGT unique numbering for C-DOMAIN³⁶; http://www.imgt.org). Numbers in parentheses define exons. Numbers in italics define Eu numbering. ³⁷ The G1m17 allotype (Lys at position 120; CH1) and G1m1 allotype (Asp and Leu at positions 12 and 14, respectively; CH3) are both found on IGHG1*01 and IGHG1*2 alleles. The G1m3 allotype (Arg at position 120; CH1) and nG1m1 (Glu and Met at positions 12 and 14, respectively) are found on IGHG1*03 allele. Upper case letter within 3 letter amino acid code indicates polymorphic nucleotide.