No effect on blood pressure level or variability of polymorphisms in DNA at the locus for atrial natriuretic factor...

We have examined healthy Norwegians with respect to two restriction fragment length polymorphisms at the locus for atrial natriuretic factor, detectable with the restriction enzymes XhoI and BglI, respectively. No association with systolic or diastolic blood pressure level or variability was found. Thus, the normal genes detected by examination of these restriction fragment length polymorphisms have neither "level gene" nor "variability gene" effects on normal blood pressure.