Genetic factors regulate processes related to anxiety in mice.

The propensity for anxiety-related behavior has been studied by comparing two highly inbred strains of mice, ABP/Le and C57BL/6ByJ, in two behavioral procedures, open-field and li ht-dark preference. Their Mendelian F-2 population allowed us to evaluate the putative involvement of four easily identifiable loci in anxiogenic processes. In fact, chromosomal regions containing the brown, pink-eyed dilution and short-ear loci on the 4th, 7th and 9th chromosomes respectively are associated with anxiety-related behavior patterns. In addition, binding of [H-3]flumazenil to brain GABA, receptors was measured as a biochemical index that may be associated with observed behavior patterns. (C) 1997 Elsevier Science B.V.