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Transgenic mice ubiquitously overexpressing murine γaminobutyric acid transporter subtype I were created. Unexpectedly, these mice markedly exhibited heritable obesity,which features significantly increased body weight and fat deposition. Behavioral examination revealed that transgenic mice have slightly reduced spontaneous locomotive capacity and altered feeding pattern. This preliminary finding indicates that the inappropriate level of γ-aminobutyric acid transporters may be directly or indirectly involved in the pathogenic mechanism underlying certain types of obesity.