Targeting of retrovirus-derived Rtl8a / 8b reduces social response and increases apathy-like behavior associated with GABRB2 reduction

Retrotransposon Gag-like (RTL) 8A, 8B and 8C are eutherian-specific genes derived from a certain retrovirus. They clustered as a triplet of genes on the X chromosome, but their function remains unknown. Here, we demonstrate that Rtl8a and Rtl8b play important roles in the brain: their double knockout (DKO) mice not only exhibit reduced social responses and increased apathy-like behavior, but also become obese from young adulthood. Mouse RTL8A/8B proteins are expressed in the prefrontal cortex and hypothalamus and localize to both the nucleus and cytoplasm of neurons, presumably due to the N-terminal nuclear localization signal-like sequence at the N-terminus. An RNAseq study in the cerebral cortex revealed reduced expression of several GABA type A receptor subunits, in particular the β2 subunit of Gabrb2, in DKO. We confirmed the reduction of GABRB2 protein in the DKO cerebral cortex by Western blotting. As GABRB2 has been implicated in the etiology of several neurodevelopmental disorders, it is likely that the reduction of GABRB2 is one of the major causes of the neuropsychiatric defects in the DKO mice.