{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nAlthough none of the provided abstracts explicitly mention a protein or gene called POTEM, a synthesis of the reported studies reveals a network of cellular mechanisms centered on protein quality control and G protein–mediated signal transduction that may offer clues to POTEM’s prospective role. For instance, one study demonstrates that in degenerating rod photoreceptors, excessive production of misfolded transducin subunits overwhelms the proteasomal system, leading to insufficient clearance of aberrant proteins and subsequent cell death."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " This work underscores the critical importance of regulated proteostasis in maintaining retinal cell viability.\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAdditional studies elaborate on complementary aspects of G protein signaling in diverse physiological contexts. In retinal ON bipolar cells, the dissociation of the Gβγ dimer—released upon activation of mGluR6—is shown to close the TRPM1 channel, thereby modulating visual signal transduction."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " Moreover, elimination of the transducin γ‐subunit drastically diminishes signal amplification in rods"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": ", while ectopic expression of cone transducin α reveals functional interchangeability with its rod counterpart."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": " Further broadening the scope, a yeast two-hybrid screen identified interactions between Gβ subunits and the N termini of adenylyl cyclases"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": ", and another investigation connected Gβγ signaling to leukocyte migration via the binding partner WDR26."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": " In addition, studies on noncanonical GPCR signaling elucidate mechanisms such as IGF-1–induced ciliary resorption that drive cell cycle progression"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": ", and investigations into Gβγ interactions with SNARE complexes detail presynaptic inhibition essential for neurotransmission."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nCollectively, these diverse yet interconnected studies highlight the importance of finely tuned proteasomal degradation and G protein–coupled signaling in maintaining cellular homeostasis in both neural and immune systems. Although the specific molecular function of POTEM is not directly addressed in any of these abstracts, the convergence of these findings suggests that if POTEM is indeed a factor in these pathways, it may be implicated in modulating proteostasis and/or the efficiency of G protein signal propagation. Further targeted research will be required to clarify whether POTEM intersects with these critical regulatory networks.\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ekaterina S Lobanova, Stella Finkelstein, Nikolai P Skiba, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Proteasome overload is a common stress factor in multiple forms of inherited retinal degeneration."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Proc Natl Acad Sci U S A (2013)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1073/pnas.1305521110"}], "href": "https://doi.org/10.1073/pnas.1305521110"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "23716657"}], "href": "https://pubmed.ncbi.nlm.nih.gov/23716657"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Yin Shen, Melissa Ann F Rampino, Reed C Carroll, et al. "}, {"type": "b", "children": [{"type": "t", "text": "G-protein-mediated inhibition of the Trp channel TRPM1 requires the Gβγ dimer."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Proc Natl Acad Sci U S A (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1073/pnas.1117433109"}], "href": "https://doi.org/10.1073/pnas.1117433109"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "22586107"}], "href": "https://pubmed.ncbi.nlm.nih.gov/22586107"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Alexander V Kolesnikov, Loryn Rikimaru, Anne K Hennig, et al. "}, {"type": "b", "children": [{"type": "t", "text": "G-protein betagamma-complex is crucial for efficient signal amplification in vision."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Neurosci (2011)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1523/JNEUROSCI.0174-11.2011"}], "href": "https://doi.org/10.1523/JNEUROSCI.0174-11.2011"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "21632928"}], "href": "https://pubmed.ncbi.nlm.nih.gov/21632928"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Wen Mao, K J Miyagishima, Yun Yao, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Functional comparison of rod and cone Gα(t) on the regulation of light sensitivity."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2013)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M112.430058"}], "href": "https://doi.org/10.1074/jbc.M112.430058"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "23288843"}], "href": "https://pubmed.ncbi.nlm.nih.gov/23288843"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Xianlong Gao, Rachna Sadana, Carmen W Dessauer, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Conditional stimulation of type V and VI adenylyl cyclases by G protein betagamma subunits."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M607522200"}], "href": "https://doi.org/10.1074/jbc.M607522200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17110384"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17110384"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Zhizeng Sun, Xiaoyun Tang, Fang Lin, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The WD40 repeat protein WDR26 binds Gβγ and promotes Gβγ-dependent signal transduction and leukocyte migration."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2011)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M111.301382"}], "href": "https://doi.org/10.1074/jbc.M111.301382"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "22065575"}], "href": "https://pubmed.ncbi.nlm.nih.gov/22065575"}]}, {"type": "r", "ref": 7, "children": [{"type": "t", "text": "Celine Yeh, Aiqun Li, Jen-Zen Chuang, et al. "}, {"type": "b", "children": [{"type": "t", "text": "IGF-1 activates a cilium-localized noncanonical Gβγ signaling pathway that regulates cell-cycle progression."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Dev Cell (2013)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.devcel.2013.07.014"}], "href": "https://doi.org/10.1016/j.devcel.2013.07.014"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "23954591"}], "href": "https://pubmed.ncbi.nlm.nih.gov/23954591"}]}, {"type": "r", "ref": 8, "children": [{"type": "t", "text": "Zack Zurawski, Analisa D Thompson Gray, Lillian J Brady, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Disabling the Gβγ-SNARE interaction disrupts GPCR-mediated presynaptic inhibition, leading to physiological and behavioral phenotypes."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Sci Signal (2019)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1126/scisignal.aat8595"}], "href": "https://doi.org/10.1126/scisignal.aat8595"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "30783011"}], "href": "https://pubmed.ncbi.nlm.nih.gov/30783011"}]}]}]}