RT Journal Article
SR Electronic
T1 Dysfunction of Unc119, a transducin-binding protein, leads to cone-rod dystrophy through activating JAK-STAT and NF-κB inflammatory pathways in the mouse retina
JF The Journal of Neuroscience
JO J. Neurosci.
FD Society for Neuroscience
SP e2245242025
DO 10.1523/JNEUROSCI.2245-24.2025
A1 Kobayashi, Koki
A1 Chaya, Taro
A1 Tu, Hung-Ya
A1 Maeda, Yamato
A1 Nakashima, Yuki
A1 Tsutsumi, Ryotaro
A1 Yamamoto, Haruka
A1 Tsujii, Toshinori
A1 Okuzaki, Daisuke
A1 Furukawa, Takahisa
YR 2025
UL http://www.jneurosci.org/content/early/2025/10/16/JNEUROSCI.2245-24.2025.abstract
AB Transducin is a heterotrimeric G protein that is a component of the phototransduction cascade in rod and cone photoreceptor cells of the retina. Gnat1, a rod-specific transducin α-subunit, regulates light/dark adaptation by changing its subcellular localization depending on light. Our previous study revealed that Gnat1 translocation in rod photoreceptor cells under light/dark conditions requires E3 ligase Klhl18-mediated ubiquitination and degradation of Unc119, a Gnat1-binding protein. A mutation in the human UNC119 gene is associated with cone-rod dystrophy (CRD); however, the underlying pathological mechanism remains unclear. In this study, we generated and analyzed Unc119-deficient (Unc119−/−) mice. We found that the retinas of Unc119−/− mice of both sexes exhibited progressive photoreceptor degeneration, resembling CRD in humans. We also found that Unc119 interacts with Gnat2 in cone photoreceptor cells and that Unc119 is essential for the translocation of Gnat2 to the outer segment in cone photoreceptor cells. RNA-seq and subsequent bioinformatics analysis revealed the predicted activation of the JAK-STAT and NF-κB pathways in the Unc119−/− retina. Treatment of Unc119−/− mice with curcumin, an inhibitor of the JAK-STAT and NF-κB pathways, suppressed inflammation and cone photoreceptor cell degeneration in Unc119−/− retinas. Furthermore, a human CRD associated-UNC119 mutant protein competitively inhibited the interaction between UNC119 and GNAT1 or GNAT2. Taken together, the current study suggests that UNC119 dysfunction leads to CRD by affecting the JAK-STAT and NF-κB pathways, and may advance our understanding of the pathological mechanisms of CRD.Significance Statement Unc119 functions in light-dark adaptation by modulating the subcellular localization of transducin, a phototransduction G-protein, in rod photoreceptor cells. A human UNC119 gene mutation is associated with cone-rod dystrophy (CRD), manifesting as cone degeneration followed by rod degeneration; however, the underlying pathological mechanism remains unclear. In this study, we found that Unc119-deficienct mouse retina exhibited progressive photoreceptor cell degeneration, resembling CRD. JAK-STAT and NF-κB inflammatory pathways were activated in the Unc119−/− retina, and treatment of Unc119−/− mice with curcumin, an inhibitor of JAK-STAT and NF-κB pathways, suppressed cone photoreceptor degradation. Furthermore, a human CRD-associated UNC119 mutant protein competitively inhibited the interaction between UNC119 and a transducin component. This study advances our understanding of the pathological mechanisms that underlie CRD.