Bi-allelic LETM1 variants perturb mitochondrial ion homeostasis leading to a clinical spectrum with predominant nervous system involvement

Kaiyrzhanov, Rauan; Mohammed, Sami E.M.; Maroofian, Reza; Husain, Ralf A.; Catania, Alessia; Torraco, Alessandra; Alahmad, Ahmad; Dutra‐Clarke, Marina; Grønborg, Sabine; Sudarsanam, Annapurna; Vogt, Julie; Arrigoni, Filippo; Baptista, Júlia; Haider, Shahzad; Feichtinger, René G.; Bernardi, Paolo; Zulian, Alessandra; Gusic, Mirjana; Efthymiou, Stéphanie; Bai, Renkui; Bibi, Farah; Horga, A; Martínez‐Agosto, Julian A.; Lam, Amanda; Manole, Andreea; Rodriguez, Diego-Perez; Durigon, Romina; Pyle, Angela; Albash, Buthaina; Dionisi‐Vici, Carlo; Murphy, David; Martinelli, Diego; Bugiardini, Enrico; Allis, Katrina; Lamperti, Costanza; Reipert, Siegfried; Risom, Lotte; Laugwitz, Lucia; Nottia, Michela Di; McFarland, Robert; Vilarinho, Laura; Hanna, Michael G.; Prokisch, Holger; Mayr, Johannes A.; Bertini, E.; Ghezzi, Daniele; Østergaard, Elsebet; Wortmann, Saskia B.; Carrozzo, Rosalba; Haack, Tobias B.; Taylor, Robert W.; Spinazzola, Antonella; Nowikovsky, Karin; Houlden, Henry

doi:10.1016/j.ajhg.2022.07.007

Cited by 4 publications

(1 citation statement)

References 74 publications

(88 reference statements)

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“…The continuous advancement of medical research has led to the recognition that protein phosphorylation modification plays a crucial role in the occurrence, development, and treatment of pancreatic cancer [ 3 ]. Phosphorylation is the predominant post-translational modification of proteins and contributes to various biological processes, including signal transduction, cell cycle regulation, and metabolic control [ 4 – 6 ].…”

Section: Introductionmentioning

confidence: 99%

Deciphering the SOX4/MAPK1 regulatory axis: a phosphoproteomic insight into IQGAP1 phosphorylation and pancreatic Cancer progression

Song,

Wang,

Liu

et al. 2024

J Transl Med

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Objective This study aims to elucidate the functional role of IQGAP1 phosphorylation modification mediated by the SOX4/MAPK1 regulatory axis in developing pancreatic cancer through phosphoproteomics analysis. Methods Proteomics and phosphoproteomics data of pancreatic cancer were obtained from the Clinical Proteomic Tumor Analysis Consortium (CPTAC) database. Differential analysis, kinase-substrate enrichment analysis (KSEA), and independent prognosis analysis were performed on these datasets. Subtype analysis of pancreatic cancer patients was conducted based on the expression of prognostic-related proteins, and the prognosis of different subtypes was evaluated through prognosis analysis. Differential analysis of proteins in different subtypes was performed to identify differential proteins in the high-risk subtype. Clinical correlation analysis was conducted based on the expression of prognostic-related proteins, pancreatic cancer typing results, and clinical characteristics in the pancreatic cancer proteomics dataset. Functional pathway enrichment analysis was performed using GSEA/GO/KEGG, and most module proteins correlated with pancreatic cancer were selected using WGCNA analysis. In cell experiments, pancreatic cancer cells were grouped, and the expression levels of SOX4, MAPK1, and the phosphorylation level of IQGAP1 were detected by RT-qPCR and Western blot experiments. The effect of SOX4 on MAPK1 promoter transcriptional activity was assessed using a dual-luciferase assay, and the enrichment of SOX4 on the MAPK1 promoter was examined using a ChIP assay. The proliferation, migration, and invasion functions of grouped pancreatic cancer cells were assessed using CCK-8, colony formation, and Transwell assays. In animal experiments, the impact of SOX4 on tumor growth and metastasis through the regulation of MAPK1-IQGAP1 phosphorylation modification was studied by constructing subcutaneous and orthotopic pancreatic cancer xenograft models, as well as a liver metastasis model in nude mice. Results Phosphoproteomics and proteomics data analysis revealed that the kinase MAPK1 may play an important role in pancreatic cancer progression by promoting IQGAP1 phosphorylation modification. Proteomics analysis classified pancreatic cancer patients into two subtypes, C1 and C2, where the high-risk C2 subtype was associated with poor prognosis, malignant tumor typing, and enriched tumor-related pathways. SOX4 may promote the occurrence of the high-risk C2 subtype of pancreatic cancer by regulating MAPK1-IQGAP1 phosphorylation modification. In vitro cell experiments confirmed that SOX4 promoted IQGAP1 phosphorylation modification by activating MAPK1 transcription while silencing SOX4 inhibited the proliferation, migration, and invasion of pancreatic cancer cells by reducing the phosphorylation level of MAPK1-IQGAP1. In vivo, animal experiments further confirmed that silencing SOX4 suppressed the growth and metastasis of pancreatic cancer by reducing the phosphorylation level of MAPK1-IQGAP1. Conclusion The findings of this study suggest that SOX4 promotes the phosphorylation modification of IQGAP1 by activating MAPK1 transcription, thereby facilitating the growth and metastasis of pancreatic cancer.

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Section: Introductionmentioning

confidence: 99%

Deciphering the SOX4/MAPK1 regulatory axis: a phosphoproteomic insight into IQGAP1 phosphorylation and pancreatic Cancer progression

Song,

Wang,

Liu

et al. 2024

J Transl Med

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The mysteries of LETM1 pleiotropy

Mohammed,

Nowikovsky

2024

Pharmacological Research

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Calcium signaling in mitochondrial intermembrane space

Goyani,

Shukla,

Jadiya

et al. 2024

Biochemical Society Transactions

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The mitochondrial intermembrane space (IMS) is a highly protected compartment, second only to the matrix. It is a crucial bridge, coordinating mitochondrial activities with cellular processes such as metabolites, protein, lipid, and ion exchange. This regulation influences signaling pathways for metabolic activities and cellular homeostasis. The IMS harbors various proteins critical for initiating apoptotic cascades and regulating reactive oxygen species production by controlling the respiratory chain. Calcium (Ca2+), a key intracellular secondary messenger, enter the mitochondrial matrix via the IMS, regulating mitochondrial bioenergetics, ATP production, modulating cell death pathways. IMS acts as a regulatory site for Ca2+ entry due to the presence of different Ca2+ sensors such as MICUs, solute carriers (SLCs); ion exchangers (LETM1/SCaMCs); S100A1, mitochondrial glycerol-3-phosphate dehydrogenase, and EFHD1, each with unique Ca2+ binding motifs and spatial localizations. This review primarily emphasizes the role of these IMS-localized Ca2+ sensors concerning their spatial localization, mechanism, and molecular functions. Additionally, we discuss how these sensors contribute to the progression and pathogenesis of various human health conditions and diseases.

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Bi-allelic LETM1 variants perturb mitochondrial ion homeostasis leading to a clinical spectrum with predominant nervous system involvement

Cited by 4 publications

References 74 publications

Deciphering the SOX4/MAPK1 regulatory axis: a phosphoproteomic insight into IQGAP1 phosphorylation and pancreatic Cancer progression

Deciphering the SOX4/MAPK1 regulatory axis: a phosphoproteomic insight into IQGAP1 phosphorylation and pancreatic Cancer progression

The mysteries of LETM1 pleiotropy

Calcium signaling in mitochondrial intermembrane space

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