A novel missense creatine mutant of , c.464G>A (p.G155D), associated with autosomal dominant nocturnal frontal lobe epilepsy (ADNFLE), reduces the expression of CaBP4.

BACKGROUND

encodes Ca-binding protein 4, a neuronal Ca-binding protein that participates in many cellular processes by regulating the concentration of free Ca ions. variants have been identified as a cause of congenital stationary night blindness (CSNB). However, we recently reported a 4-generation pedigree with 11 individuals diagnosed with autosomal dominant nocturnal frontal lobe epilepsy (ADNFLE) that were validated with only one novel missense mutation, c.464G>A (p.G155D), in . variants have never been reported to be related with ADNFLE. This study aimed to identify whether c.464G>A (p.G155D) in reduced the expression of CaBP4.

METHODS

experiments using recombinant protein expressed in human neuron cells were utilized in this study. Real-time polymerase chain reaction (RT-PCR) was performed to evaluate the effect of c.464G>A on mRNA expression. Western blot was performed to assess the effect of c.464G>A on CaBP4 protein expression.

RESULTS

According to the RT-PCR and Western blot results, c.464G>A (p.G155D) was associated with an increased expression of mRNA and a reduced expression of CaBP4 protein.

CONCLUSIONS

These results reveal that c.464G>A (p.G155D) in reduced the expression of CaBP4 by reducing the stability of the CaBP4 protein. Mutations in the gene may be associated with ADNFLE.