Quantum theta functions and Gabor frames for modulation spaces

Representations of the celebrated Heisenberg commutation relations in quantum mechanics and their exponentiated versions form the starting point for a number of basic constructions, both in mathematics and mathematical physics (geometric quantization, quantum tori, classical and quantum theta functions) and signal analysis (Gabor analysis). In this paper we try to bridge the two communities, represented by the two co--authors: that of noncommutative geometry and that of signal analysis. After providing a brief comparative dictionary of the two languages, we will show e.g. that the Janssen representation of Gabor frames with generalized Gaussians as Gabor atoms yields in a natural way quantum theta functions, and that the Rieffel scalar product and associativity relations underlie both the functional equations for quantum thetas and the Fundamental Identity of Gabor analysis.Comment: 38 pages, typos corrected, MSC class change

From old to new - Repurposing drugs to target mitochondrial energy metabolism in cancer.

Although we have entered the era of personalized medicine and tailored therapies, drugs that target a large variety of cancers regardless of individual patient differences would be a major advance nonetheless. This review article summarizes current concepts and therapeutic opportunities in the area of targeting aerobic mitochondrial energy metabolism in cancer. Old drugs previously used for diseases other than cancer, such as antibiotics and antidiabetics, have the potential to inhibit the growth of various tumor entities. Many drugs are reported to influence mitochondrial metabolism. However, here we consider only those drugs which predominantly inhibit oxidative phosphorylation

Genotypic and phenotypic spectrum of infantile liver failure due to pathogenic TRMU variants

Purpose: The study aimed to define the genotypic and phenotypic spectrum of reversible acute liver failure (ALF) of infancy resulting from biallelic pathogenic TRMU variants and to determine the role of cysteine supplementation in its treatment. Methods: Individuals with biallelic (likely) pathogenic variants in TRMU were studied through an international retrospective collection of de-identified patient data. Results: In 62 individuals, including 30 previously unreported cases, we described 48 (likely) pathogenic TRMU variants, of which, 18 were novel. Of these 62 individuals, 42 were alive at a median age of 6.8 (0.6-22) years after a median follow up of 3.6 (0.1-22) years. The most frequent finding, occurring in all but 2 individuals, was liver involvement. ALF occurred only in the first year of life and was reported in 43 of 62 individuals, 11 of whom received liver transplantation. Loss-of-function TRMU variants were associated with poor survival. Supplementation with at least 1 cysteine source, typically N-acetylcysteine, improved survival significantly. Neurodevelopmental delay was observed in 11 individuals and persisted in 4 of the survivors, but we were unable to determine whether this was a primary or a secondary consequence of TRMU deficiency. Conclusion: In most patients, TRMU-associated ALF is a transient, reversible disease and cysteine supplementation improved survival. © 2022 The AuthorsDMB-1805- 0002; 01GM1207; MR/S005021/1; G0800674; National Institutes of Health, NIH: 5U54-NS078059-11, 5U54-NS115198-02; Wellcome Trust, WT: 203105/Z/16/Z; PTC Therapeutics, PTC; Manchester Biomedical Research Centre, BRC; Medical Research Council, MRC: MR/W019027/1; Pathological Society of Great Britain and Ireland; National Health and Medical Research Council, NHMRC: GNT1155244, GNT1164479; Bundesministerium für Bildung und Forschung, BMBF: 01GM1906B, 01KU2016A; Newcastle upon Tyne Hospitals NHS Foundation Trust; State Government of Victoria; Astellas Pharma; Bundesministerium für Bildung und Frauen, BMBF; Medizinische Universität Innsbruck, MUI; King Salman Center for Disability Research, KSCDR: RG-2022-010; Lily FoundationThe Chair in Genomic Medicine awarded to J.C. is generously supported by The Royal Children’s HospitalFoundation The Royal Children's Hospital Foundation . We are grateful to the Crane, Perkins, and Miller families for their generous financial support. We thank the Kinghorn Centre for Clinical Genomics for assistance with production and processing of genome sequencing data. This project was supported by the funding from MitoCanada ( https://mitocanada.org ) as part of the Mitochondrial Functional and Integrative Next Generation Diagnostics (MITO-FIND) study. This work was supported by the European Reference Network for Hereditary Metabolic Disorders (MetabERN). S.W. received funding from ERAPERMED2019-310 Personalized Mitochondrial Medicine (PerMiM): Optimizing diagnostics and treatment for patients with mitochondrial diseases FWF 4704-B. F.S.A. is funded by the National Institutes of Health along with the North American Mitochondrial Disease Consortia (5U54-NS078059-11), the Frontiers of Congenital Disorders of Glycosylation Consortia (FCDGC, 5U54-NS115198-02), Mervar Foundation, Courage for a Cure Foundation , PTC Therapeutics , Astellas Pharma Inc, and Saol Therapeutics. R.M. and R.W.T. are funded by the Wellcome Trust Centre for Mitochondrial Research (203105/Z/16/Z), the Mitochondrial Disease Patient Cohort (United Kingdom) (G0800674), the Medical Research Council International Centre for Genomic Medicine in Neuromuscular Disease (MR/S005021/1), the Medical Research Council (MR/W019027/1), the Lily Foundation , the UK NIHR Biomedical Research Centre for Ageing and Age-related Disease award to the Newcastle upon Tyne Hospitals NHS Foundation Trust , and the UK NHS Highly Specialised Service for Rare Mitochondrial Disorders of Adults and Children. R.W.T. also receives funding from the Pathological Society of Great Britain and Ireland. J.C. is supported by a New South Wales Office of Health and Medical Research Council Sydney Genomics Collaborative grant. We acknowledge funding from the National Health and Medical Research Council ( NHMRC ): project grant GNT1164479 (D.R.T.) and Principal Research Fellowship GNT1155244 (D.R.T.). The research conducted at the Murdoch Children’s Research Institute was supported by the Victorian Government’s Operational Infrastructure Support program. This study was supported by BMBF (German Federal Ministry of Education and Research ) through the German Network for Mitochondrial Diseases ([mitoNET] grant number 01GM1906B), Personalized Mitochondrial Medicine (PerMiM) (grant number 01KU2016A), and E-Rare project GENOMIT (grant number 01GM1207) and the Bavarian State Ministry of Health and Care within its framework of DigiMed Bayern (grant number DMB-1805- 0002). The authors extend their appreciation to the King Salman Center For Disability Research for funding this work through research group number RG-2022-010 (to F.S.A.)The Chair in Genomic Medicine awarded to J.C. is generously supported by The Royal Children's HospitalFoundationThe Royal Children's Hospital Foundation. We are grateful to the Crane, Perkins, and Miller families for their generous financial support. We thank the Kinghorn Centre for Clinical Genomics for assistance with production and processing of genome sequencing data. This project was supported by the funding from MitoCanada (https://mitocanada.org) as part of the Mitochondrial Functional and Integrative Next Generation Diagnostics (MITO-FIND) study. This work was supported by the European Reference Network for Hereditary Metabolic Disorders (MetabERN). S.W. received funding from ERAPERMED2019-310 Personalized Mitochondrial Medicine (PerMiM): Optimizing diagnostics and treatment for patients with mitochondrial diseases FWF 4704-B. F.S.A. is funded by the National Institutes of Health along with the North American Mitochondrial Disease Consortia (5U54-NS078059-11), the Frontiers of Congenital Disorders of Glycosylation Consortia (FCDGC, 5U54-NS115198-02), Mervar Foundation, Courage for a CureFoundation, PTC Therapeutics, Astellas Pharma Inc, and Saol Therapeutics. R.M. and R.W.T. are funded by the Wellcome Trust Centre for Mitochondrial Research (203105/Z/16/Z), the Mitochondrial Disease Patient Cohort (United Kingdom) (G0800674), the Medical Research Council International Centre for Genomic Medicine in Neuromuscular Disease (MR/S005021/1), the Medical Research Council (MR/W019027/1), the LilyFoundation, the UK NIHR Biomedical Research Centre for Ageing and Age-related Disease award to the Newcastle upon Tyne Hospitals NHS Foundation Trust, and the UK NHS Highly Specialised Service for Rare Mitochondrial Disorders of Adults and Children. R.W.T. also receives funding from the Pathological Society of Great Britain and Ireland. J.C. is supported by a New South Wales Office of Health and Medical Research Council Sydney Genomics Collaborative grant. We acknowledge funding from the National Health and Medical Research Council (NHMRC): project grant GNT1164479 (D.R.T.) and Principal Research Fellowship GNT1155244 (D.R.T.). The research conducted at the Murdoch Children's Research Institute was supported by the Victorian Government's Operational Infrastructure Support program. This study was supported by BMBF (German Federal Ministry of Education and Research) through the German Network for Mitochondrial Diseases ([mitoNET] grant number 01GM1906B), Personalized Mitochondrial Medicine (PerMiM) (grant number 01KU2016A), and E-Rare project GENOMIT (grant number 01GM1207) and the Bavarian State Ministry of Health and Care within its framework of DigiMed Bayern (grant number DMB-1805- 0002). The authors extend their appreciation to the King Salman Center For Disability Research for funding this work through research group number RG-2022-010 (to F.S.A.), Conceptualization: G.F.V. S.W.; Data Curation: G.F.V. S.W. Y.M.-G. Y.E.L. R.G.F. J.A.M. H.B. L.D.S. H.Pr. A.Pec. F.S.A. J.J.B. G.B. I.B. N.B. B.B. J.C. E.C. D.C. A.M.D. N.D. A.D.M. F.D. E.A.E. M.E. W.F. P.G. R.D.G. E.G. C.H. J.H. V.K. M.Ko. M.Ke. A.K. D.L. R.M. M.G.M. K.Mo. T.M. K.Mu. E.N. A.Pen. H.Pe. D.P.-A. A.R. R.S. F.S. M.Sc. M.Shag. M.Shar. C.S.-A. C.S. I.S. M.St. R.W.T. D.R.T. E.L.T. J.-S.W. D.W.; Methodology: G.F.V. S.W. R.G.F. J.A.M.; Visualization: G.F.V. S.W. H.B. J.S.; Writing-original draft: G.F.V. S.W.; Writing-review and editing: G.F.V. S.W. Y.M.-G. Y.E.L. R.G.F. J.A.M. H.B. L.D.S. H.Pr. A.Pec. F.S.A. J.J.B. G.B. I.B. N.B. B.B. J.C. E.C. D.C. A.M.D. N.D. A.D.M. F.D. E.A.E. M.E. W.F. P.G. R.D.G. E.G. C.H. J.H. V.K. M.Ko. M.Ke. A.K. D.L. R.M. M.G.M. K.Mo. T.M. K.Mu. E.N. A.Pen. H.Pe. D.P.-A. A.R. R.S. F.S. M.Sc. M.Shag. M.Shar. C.S.-A. C.S. I.S. M.St. R.W.T. D.R.T. E.L.T. J.-S.W. D.W. This study was conducted in accordance with the guidelines of the Institutional Review Board of the Medical University of Innsbruck and the 1975 Declaration of Helsinki.29 Participants gave written informed consent for genetic investigations according to local regulations

Bi-Allelic UQCRFS1 Variants Are Associated with Mitochondrial Complex III Deficiency, Cardiomyopathy, and Alopecia Totalis

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Disturbed mitochondrial and peroxisomal dynamics due to loss of MFF causes Leigh-like encephalopathy, optic atrophy and peripheral neuropathy.

BACKGROUND: Mitochondria are dynamic organelles which undergo continuous fission and fusion to maintain their diverse cellular functions. Components of the fission machinery are partly shared between mitochondria and peroxisomes, and inherited defects in two such components (dynamin-related protein (DRP1) and ganglioside-induced differentiation-associated protein 1 (GDAP1)) have been associated with human disease. Deficiency of a third component (mitochondrial fission factor, MFF) was recently reported in one index patient, rendering MFF another candidate disease gene within the expanding field of mitochondrial and peroxisomal dynamics. Here we investigated three new patients from two families with pathogenic mutations in MFF. METHODS: The patients underwent clinical examination, brain MRI, and biochemical, cytological and molecular analyses, including exome sequencing. RESULTS: The patients became symptomatic within the first year of life, exhibiting seizures, developmental delay and acquired microcephaly. Dysphagia, spasticity and optic and peripheral neuropathy developed subsequently. Brain MRI showed Leigh-like patterns with bilateral changes of the basal ganglia and subthalamic nucleus, suggestive of impaired mitochondrial energy metabolism. However, activities of mitochondrial respiratory chain complexes were found to be normal in skeletal muscle. Exome sequencing revealed three different biallelic loss-of-function variants in MFF in both index cases. Western blot studies of patient-derived fibroblasts indicated normal content of mitochondria and peroxisomes, whereas immunofluorescence staining revealed elongated mitochondria and peroxisomes. Furthermore, increased mitochondrial branching and an abnormal distribution of fission-mediating DRP1 were observed. CONCLUSIONS: Our findings establish MFF loss of function as a cause of disturbed mitochondrial and peroxisomal dynamics associated with early-onset Leigh-like basal ganglia disease. We suggest that, even if laboratory findings are not indicative of mitochondrial or peroxisomal dysfunction, the co-occurrence of optic and/or peripheral neuropathy with seizures warrants genetic testing for MFF mutations

LYRM7 - associated complex III deficiency: A clinical, molecular genetic, MR tomographic, and biochemical study.

LYRM7 is involved in the last steps of mitochondrial complex III assembly where it acts as a chaperone for the Rieske iron‑sulfur (Fe-S) protein in the mitochondrial matrix. Using exome sequencing, we identified homozygosity for a splice site destroying 4 base pair deletion in LYRM7 in a child with recurrent lactic acidotic crises and distinct early-onset leukencephalopathy. Sanger sequencing showed variant segregation in similarly affected family members. Functional analyses revealed a reduced amount of the Rieske Fe-S protein, which was restored after re-expression of LYRM7. Our data provide further evidence for the importance of LYRM7 for mitochondrial function and emphasise the importance of whole exome sequencing in the diagnosis of rare mitochondrial diseases

Spectrum of combined respiratory chain defects.

Inherited disorders of mitochondrial energy metabolism form a large and heterogeneous group of metabolic diseases. More than 250 gene defects have been reported to date and this number continues to grow. Mitochondrial diseases can be grouped into (1) disorders of oxidative phosphorylation (OXPHOS) subunits and their assembly factors, (2) defects of mitochondrial DNA, RNA and protein synthesis, (3) defects in the substrate-generating upstream reactions of OXPHOS, (4) defects in relevant cofactors and (5) defects in mitochondrial homeostasis. Deficiency of more than one respiratory chain enzyme is a common finding. Combined defects are found in 49 % of the known disease-causing genes of mitochondrial energy metabolism and in 57 % of patients with OXPHOS defects identified in our diagnostic centre. Combined defects of complexes I, III, IV and V are typically due to deficiency of mitochondrial DNA replication, RNA metabolism or translation. Defects in cofactors can result in combined defects of various combinations, and defects of mitochondrial homeostasis can result in a generalised decrease of all OXPHOS enzymes. Noteworthy, identification of combined defects can be complicated by different degrees of severity of each affected enzyme. Furthermore, even defects of single respiratory chain enzymes can result in combined defects due to aberrant formation of respiratory chain supercomplexes. Combined OXPHOS defects have a great variety of clinical manifestations in terms of onset, course severity and tissue involvement. They can present as classical encephalomyopathy but also with hepatopathy, nephropathy, haematologic findings and Perrault syndrome in a subset of disorders

The spectrum of pyruvate oxidation defects in the diagnosis of mitochondrial disorders

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