The 3111T/C single nucleotide polymorphism (SNP) of Circadian Locomotor Output Cycles Kaput (CLOCK) gene reportedly affects gastric motility before breakfast. It is of interest to know whether this SNP can affect the motility during the daytime. We investigated the association between the CLOCK 3111T/C SNP and several gastric motility parameters during the time period from 8:00 to 20:00 in 34 young women with scheduled meals. There were similar daytime fluctuations in gastric motility before and after the meals between the major (T/T) and minor (T/C) allele carriers. The CLOCK SNP may affect daytime gastric motility less than food stimulation.
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