Xenobiotic Sensor- and Metabolism-Related Gene Variants in Environmental Sensitivity-Related Illnesses: A Survey on the Italian Population

Table 2

Allele and genotype frequencies of AhR-related gene variants in SRI patients (MCS: multiple chemical sensitivity; sMCS: suspected multiple chemical sensitivity; FM/CFS: $fibromyalgia/chronic fatigue syndrome) and healthy subjects (Ctr: controls).

Genotype	MCS	SMCS	FM/CFS	Ctr
AHR	𝑁 = 156	𝑁 = 56	𝑁 = 32	𝑁 = 54
Arg554Arg	80.1%	82.1%	68.7%	77.8%
Arg554Lys	19.9%	17.9%	31.3%	16.7%
Lys554Lys	—	—	—	5.6%
A allele frequency	0.099	0.089	0.156	0.139