{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMitochondrial DNA (mtDNA) is organized into nucleoid structures that are essential for the organelle’s energy production and overall cellular metabolism. Uncharacterized proteins that associate with these nucleoids are of great interest, as they may provide novel insights into mitochondrial maintenance and function. Recent proximity labeling and imaging studies have identified MTNAP1 (formerly known as C17orf80) as a mitochondrial membrane-associated protein that localizes near the nucleoid, suggesting it plays a role in the structural organization of mtDNA within mitochondria."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFurther analyses using immunofluorescence microscopy and proteomics have confirmed that MTNAP1 maintains a close association with mitochondrial nucleoids, even under conditions that inhibit mtDNA replication. Interestingly, although its nucleoid proximity and interactions imply a functional role in mtDNA dynamics, one study demonstrated that MTNAP1 is not essential for the basic processes of mtDNA maintenance and mitochondrial gene expression in cultured human cells."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn contrast, complementary findings highlight MTNAP1 as a bona fide mitochondrial nucleoid protein with robust double-stranded DNA binding activity across the mitochondrial genome. According to these results, MTNAP1 actively promotes mtDNA replication and helps sustain mtDNA homeostasis, thereby influencing mitochondrial metabolism and cell proliferation. These observations suggest that MTNAP1 could represent a promising therapeutic target for human diseases associated with defective mtDNA control."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Alisa Potter, Anu Hangas, Steffi Goffart, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Uncharacterized protein C17orf80 - a novel interactor of human mitochondrial nucleoids."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Cell Sci (2023)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1242/jcs.260822"}], "href": "https://doi.org/10.1242/jcs.260822"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "37401363"}], "href": "https://pubmed.ncbi.nlm.nih.gov/37401363"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Hao Wu, Wenshuo Zhang, Fengli Xu, et al. "}, {"type": "b", "children": [{"type": "t", "text": "C17orf80 binds the mitochondrial genome to promote its replication."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Cell Biol (2023)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1083/jcb.202302037"}], "href": "https://doi.org/10.1083/jcb.202302037"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "37676315"}], "href": "https://pubmed.ncbi.nlm.nih.gov/37676315"}]}]}]}