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Quantitative subcellular reconstruction reveals a lipid mediated inter-organelle biogenesis network

Abstract

The structures and functions of organelles in cells depend on each other but have not been systematically explored. We established stable knockout cell lines of peroxisomal, Golgi and endoplasmic reticulum genes identified in a whole-genome CRISPR knockout screen for inducers of mitochondrial biogenesis stress, showing that defects in peroxisome, Golgi and endoplasmic reticulum metabolism disrupt mitochondrial structure and function. Our quantitative total-organelle profiling approach for focussed ion beam scanning electron microscopy revealed in unprecedented detail that specific organelle dysfunctions precipitate multi-organelle biogenesis defects, impair mitochondrial morphology and reduce respiration. Multi-omics profiling showed a unified proteome response and global shifts in lipid and glycoprotein homeostasis that are elicited when organelle biogenesis is compromised, and that the resulting mitochondrial dysfunction can be rescued with precursors for ether-glycerophospholipid metabolic pathways. This work defines metabolic and morphological interactions between organelles and how their perturbation can cause disease.

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Fig. 1: Whole-genome screening for biogenesis stress responses.
Fig. 2: Organelle defects cause cell-wide morphology changes.
Fig. 3: Morphometric profiling reveals unified mitochondrial morphology defects across peroxisome, Golgi and ER dysfunction.
Fig. 4: Organelle defects alter cell-wide organelle interactions and communication.
Fig. 5: Organelle defects trigger an inter-organelle biogenesis response in the proteome.
Fig. 6: Defects in ether-lipid metabolism underlie the global morphological and functional changes in mitochondria, peroxisomes, ER and Golgi.
Fig. 7: Ether-lipid supplementation rescues fragmented mitochondrial morphology in cells with defects in peroxisome, Golgi and ER biogenesis.

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Data availability

Genomic data were deposited to the Gene Expression Omnibus under the accession code GSE201573 and the mass spectrometry proteomics data were deposited to ProteomeXchange (http://proteomecentral.proteomexchange.org) via the PRIDE partner repository project accession code PXD033871. Lipidomic datasets were uploaded to Metabolomics Workbench and can be accessed directly via its project: https://doi.org/10.21228/M8143Q. N- and O-glycome raw data files are available via GlycoPost92 under the identifier GPST000271. Data related to FIB-SEM imaging and AIVE analysis are available via EMPIAR93 with the public accession code EMPIAR-11695. Source data are provided with this paper. All other data supporting the findings of this study are available from the corresponding author on reasonable request and material requests are subject to a material transfer agreement mandated by our institutions.

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Acknowledgements

We thank A.-M. Shearwood for genotyping, J. Ermer and J. Matthews for assistance with sample handling during the whole-genome screens, T. Gulati and I. Nikolic (Victorian Centre for Functional Genomics) for advice on CRISPR screening, and S. Paul, P. Meikle and T. Mercer for their valuable advice. The CAL51 Cas9–mCherry stable cell line was a kind gift from V. Wickramasinghe. We thank Microscopy Australia at the Centre for Microscopy, Characterisation and Analysis (The University of Western Australia) for scientific and technical assistance, and Thermo Fisher Scientific for providing the FAIMS Pro interface as part of a collaborative research agreement with G.E.R. This project was supported by fellowships and project grants from the NHMRC, ARC, WACRF and Telethon Trust (to O.R. and A.F.), and a project grant from the McCusker Foundation (to A.F.). R.G.L. was supported by the Mito Foundation and WACRF. M.S. and D.L.R. were supported by UWA Postgraduate Scholarships. N.D. was supported by a MQ Research Excellence Scholarship and CSIRO FSP Synbio Top-up Scholarship. The Queensland Metabolomics and Proteomics node is supported by the Australian Government Department of Education through the National Collaborative Research Infrastructure Strategy, the Super Science Initiative, and the Collaborative Research Infrastructure Scheme and the Queensland Government. The Victorian Centre for Functional Genomics (K.J.S.) is funded by the Australian Cancer Research Foundation, Phenomics Australia through funding from the Australian Government’s National Collaborative Research Infrastructure Strategy programme, the Peter MacCallum Cancer Centre Foundation and the University of Melbourne Research Collaborative Infrastructure Program. Metabolomics Workbench, where the lipidomics datasets are deposited, is supported by NIH grant numbers U2C-DK119886 and OT2-OD030544.

Author information

Authors and Affiliations

Authors

Contributions

Conceptualization: O.R. and A.F. Investigation: R.G.L., D.L.R., S.J.S., S.A.R., B.S.P., L.P., E.S.X.M., T.M., N.J.D., M.S., J.B., F.F.R., B.S.P., A.C., S.V.F., K.J.S., J.L., E.M., G.E.R., O.R. and A.F. Visualization: R.G.L., D.L.R., S.J.S., S.A.R., B.S.P., O.R. and A.F. Funding acquisition: O.R., A.F., G.R., E.M., N.H.P. and K.J.S. Project administration: A.F. Writing (original draft): R.G.L. and A.F. Writing (review and editing): all authors.

Corresponding author

Correspondence to Aleksandra Filipovska.

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The authors declare no competing interests.

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Nature Cell Biology thanks Antentor Hinton Jr, Irfan Lodhi and the other, anonymous, reviewer(s) for their contribution to the peer review of this work. Peer reviewer reports are available.

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Extended data

Extended Data Fig. 1 Establishing the CAL51MG cell line.

a, Schematic of the strategy used to incorporate the GFP reporter into the MRPL12 gene of CAL51 cells. b, Mitochondria from 143B cells transfected with MRPL12-GFP were separated on a 10-30% sucrose gradient. Migration of MRPL12-GFP was examined relative to endogenous MRPL12 (large subunit) and MRPS16 (small subunit) by immunoblotting. c, 50 µg of cell lysate from wild-type CAL51 and CAL51MG cells was resolved by SDS-PAGE and immunoblotted for MRPL12 or GFP. GAPDH was used as a loading control. d, Fluorescence activated cell sorting analysis of GFP intensity in wild-type CAL51, CAL51MG, and CAL51MG cells transfected with a gRNA targeting MRPP3. e, Biological process gene ontologies of enriched genes localizing to the nucleus, peroxisomes, Golgi, and ER in the 3-day populations. f,g, Significantly enriched genes in f, 3-day and g, 7-day populations determined by MaGeCK MLE analysis, were used to examine KEGG pathways and biological process gene ontologies of hits from both populations. h, Significantly enriched KEGG pathways relating to organelle and gene expression machinery function in the 3- and 7-day populations. Source numerical data and unprocessed blots are available in source data and Supplementary Table 1.

Source data

Extended Data Fig. 2 Establishing organelle knockout cell lines.

a, Sanger sequencing of five knockout (KO) cell lines, illustrating CRISPR-induced indels in CAL51 cells. b, Sanger sequencing of PEX26 knockout alleles in HeLa cells, illustrating CRISPR-induced deletions. c, Immunoblots showing loss of PEX26, GOLGA5 and SEC62 in CAL51 cells, relative to β-actin that was used as a loading control. d, Immunoblots showing loss of PEX26 in HeLa cells, relative to β-actin that was used as a loading control. Unprocessed blots are available in source data.

Source data

Extended Data Fig. 3 Organelle knockout cell lines differentially affect mitochondrial function extended data.

a, Levels of de novo mitochondrial translation were examined in cell lines using 35S-methionine/cystine labelling. 20 µg of cell lysates were resolved on a 4–12% Bis-Tris gel and visualized by autoradiography. Equal loading was confirmed by Coomassie staining. b, Cellular ATP levels were measured using firefly luciferase bioluminescence assays (n = 10 samples). All data are presented as mean ± SEM, Student’s two-tailed t test p < 0.001, ***. Glucose: PEX26KO p = 0.000672, GOLGA5KO p = 4.21 x 10-7, GOLGA8MKO p = 5.87 x 10-6, SEC61A2KO, p = 1.69 x 10-5 and SEC62KO p = 3 x 10-7. Galactose: GOLGA5KO p = 7.24 x 10-8, GOLGA8MKO p = 3.51 x 10-6, SEC61A2KO, p = 4.35 x 10-5 and SEC62KO p = 1.16 x 10-9. c, Mitochondrial DNA copy number was measured by qPCR in all cells and normalized to levels of the β-globin gene. Data are presented as mean ± SD (n = 3 samples per genotype). Student’s two-tailed t test p < 0.05, *; p < 0.001, ***. PEX26KO p = 0.019, GOLGA5KO p = 5.8 x 10-7, SEC61A2KO, p = 0.0272 and SEC62KO p = 0.0254. d, Mitochondrial morphology was examined using MitoTracker Orange staining in HeLa control and PEX26KO cell lines. Scale bars represent 5 µm and the inset is 0.5 µm. e, Qualitative scoring of mitochondrial network morphology (n = 50 cells per genotype) for HeLa control and PEX26KO cells. Data are shown as mean ± SD. Student’s two-tailed t test p < 0.05, *PEX26KO p = 0.0117. f, Co-localization of PEX3-mCherry (peroxisome membrane) and peroxisome targeting sequence 1 (PTS1)-GFP in CAL51 control but not PEX26KO cells. Scale bars represent 5 µm and the inset is 0.5 µm. g, Mitochondrial morphology was examined using MRPL44 tagged with mCherry at the C terminus, in all cells rescued with plasmids expressing wild-type versions of their depleted proteins. Control cells were transfected with an empty vector. Scale bars represent 5 µm and the inset is 0.5 µm. h, Qualitative scoring of mitochondrial network morphology (n = 50 cells per genotype) for all cell lines. Data are shown as the mean ± SD. Source numerical data and unprocessed blots are available in source data.

Source data

Extended Data Fig. 4 Visualization of AIVE-processed voxels used for image segmentation.

(a-f) Examples of AIVE-processed data for each organelle category and cell line used in this study, with direct 2D comparisons between the FIB-SEM image data and AIVE-processed voxels for (a) peroxisomes in WT cells, (b) endosomes in PEX26 KO cells, (c) mitochondria in GOLGA5 KO cells, (d) ER in GOLGA8 KO cells, (e) Golgi in SEC61A KO cells, and (f) vesicles in SEC62 KO cells. Data are shown as full frame overview images and 2D slices (20 nm sum-projected) of an inset region spanning 200 nm of the data. (g) 3D renderings of AIVE-processed data from the inset regions depicted in a, b, c, d, e and f, respectively. Scale bars represent 1 µm. Source numerical data are available in Supplementary Table 2.

Extended Data Fig. 5 Organelle defects cause cell-wide morphology defects extended data.

a, Schematic illustrating the clustering model used to quantitate membrane volume, sphericity and Euler characteristic of organelles. b, Three-tier k-means hierarchical clustering of membrane morphometric characteristics for peroxisomes in the control and five knockout cell lines. The coloured circles represent mitochondria from the specified cell line and the grey circles are mitochondria from all cell lines as a reference; the grey dashed lines mark out the zero values of the relative sphericity and Euler characteristic. c, Proportion of peroxisomes from the seven volume classes identified by hierarchical clustering across all cell lines. d, 3D reconstructions of representative peroxisomes from control and five knockout cell lines. Scale bars represent 0.5 µm. Most prominent volumetric clusters identified by hierarchical clustering across (e) mitochondria and (f) peroxisomes from the control and five knockout cell lines. Quantitation of (g) mitochondria-ER interactions in control and SEC62KO cell lines and (h) peroxisome-ER interactions in control and GOLGA8MKO cell lines using SPLICS reporters. Data are presented as the mean ± SD of three biologically independent experiments (each performed with 4 replicates per genotype per experiment). Student’s two-tailed t test p < 0.01, **; p < 0.001, ***. SPLICS mito ER p = 0.0036 and SPLICS peroxi-ER p = 0.0001. Lines indicate the mean within each box and whisker plot, boxes indicate quartiles 2 and 3, with whiskers indicating the range from 5% to 95%. Source numerical data are available in Supplementary Table 2.

Source data

Extended Data Fig. 6 Organelle defects alter cell-wide organelle interaction and communication extended data.

Boxplots showing the standardized interacting membrane volumes between (a) mitochondria and (b) peroxisomes and other target organelles at 10, 20, and 40 nm distances, where all mitochondria or peroxisome volumes were standardized to 1 µm3 and interacting organelle volumes were scaled accordingly to the respective base organelle. Data are presented as the mean ± SD. Welch’s two tailed t test *, p < 0.05; **, p < 0.01; ***, p < 0.001. Radar plots showing interactions between mitochondria and peroxisomes with ER and Golgi at (c) 10 nm and (d) 20 nm distances. Lines indicate the mean within each box and whisker plot, boxes indicate quartiles 2 and 3, with whiskers indicating the range from 5% to 95%. Source numerical data are available in Supplementary Table 2.

Extended Data Fig. 7 Organelle defects elicit targeted transcriptomic stress responses.

a, Enrichment of biological processes gene ontologies was determined by differential expression analysis of control and five knockout cell lines. Significant enrichment was determined at s < 0.05 for differentially expressed transcripts and FDR < 0.05 for gene ontology enrichment analysis. b, Matrix of similarly changing proteins relative to control for all five knockout cell lines. c, Proportion of significantly changing RNAs in all five cell lines (red) vs RNAs that are selectively changing in only a subset of cell lines (grey). d, Hierarchical clustering of differentially expressed RNAs significantly changing (s < 0.05) commonly in all five cell lines relative to control. Gene clusters similarly enriched in all five knockout cell lines are highlighted in orange. Source numerical data are available in Supplementary Tables 3 and 4.

Extended Data Fig. 8 Organelle defects trigger inter-organelle biogenesis responses extended data.

a, Bubble plots summarized and generated by REVIGO for biological process gene ontologies determined by quantitative whole-cell proteomics from control and five knockout cell lines. b, Standard deviation of significantly changing proteins from biological processes between the five knockout cell lines. Standard deviations <0.4 are highlighted in grey and outliers are indicated with arrowheads. c, Hierarchical clustering of individual protein changes with a standard deviation cut-off of ≤0.4 in organelle-related biological process GOs in all five knockout cell lines compared to control, described in Fig. 4a. Source numerical data are available in Supplementary Table 4.

Extended Data Fig. 9 Organelle defects trigger inter-organelle biogenesis responses extended data.

a, Volcano plots of quantitative whole-cell proteomic analyses, showing changes of select mitochondrial processes in all five organelle knockout cell lines relative to control. Values that fall outside the limits of the axis are indicated with arrowheads at the ends of the x-axes and are listed in Supplementary Table 3. b, Boxplots showing changes in peroxisome, Golgi, and ER proteins in the five knockout cell lines relative to controls. Lines indicate the mean within each box and whisker plot, boxes indicate quartiles 2 and 3, with whiskers indicating the range from 5% to 95%. Source numerical data are available in Supplementary Table 4.

Extended Data Fig. 10 Lipidomic analyses extended data and predictions of pathogenic variants in genes implicated in inter-organelle biogenesis.

a, Lipid levels in control and the five knockout cell lines determined by mass spectrometry based lipidome analysis in n = 5 (WT, PEX26KO and SEC62KO) or n = 4 (GOLGA5KO, GOLGA8MKO and SEC61A2KO) independent biological samples. The abundances of phosphatidylserine (PS), ceramide (Cer) and hexocylceramide (that is, glucosyl- and galactosyl-ceramide) (HexCer) are calculated as mol percent of total detected lipids and shown as the mean ± SD. FDR < 0.05, *; FDR < 0.01, ** FDR < 0.001, ***. b, Hierarchical clustering of the expression and stability of specific enzymes involved in GP, GL, SP and ST metabolism, significantly altered in the transcriptomes and proteomes of the five knockout cell lines compared to control cells. c, Computational prediction of deleterious protein consequences of coding region variants (PHRED scores) identified in gnomAD for PEX26, GOLGA5, GOLGA8M, SEC61A2, and SEC62. X-axis annotation describes the domain architecture of each encoded protein based on conserved domain analysis and literature descriptions. d, Proportions of variants identified for PEX26, GOLGA5, GOLGA8M, SEC61A2, and SEC62 with a PHRED score ≥ known PEX26 variants implicated in Zellweger syndrome pathogenesis ( ≥ 24.5). Source numerical data are available in Supplementary Table 5.

Supplementary information

Reporting Summary

Peer Review File

Supplementary Table 1

1. Enrichment of sgRNAs by FACS at 3 and 7 d post transduction compared with unsorted cells. 2. Mito pathway annotations for enriched genes at 3 and 7 d post transduction compared with unsorted cells. 3. Enriched biological process GOs for enriched genes at 3 and 7 d post transduction compared with unsorted cells. 4. MAGeCK MLE analysis of sgRNA enrichment at 3 and 7 d post transduction. 5. Enrichment of biological process GOs in enriched genes in the MAGeCK MLE analysis. 6. KEGG pathway annotation of significantly enriched genes in the MAGeCK analysis

Supplementary Table 2

1. Morphometric data for organelles detected in control cell FIB-SEM. 2. Morphometric data for organelles detected in PEX26KO cell FIB-SEM. 3. Morphometric data for organelles detected in GOLGA5KO cell FIB-SEM. 4. Morphometric data for organelles detected in GOLGA8MKO cell FIB-SEM. 5. Morphometric data for organelles detected in SEC61A2KO cell FIB-SEM. 6. Morphometric data for organelles detected in SEC62KO cell FIB-SEM. 7. Three-tiered k-means clustering analysis for mitochondria from control, PEX26KO, GOLGA5KO, GOLGA8MKO, SEC61A2KO and SEC62KO cell lines. 8. Three-tiered k-means clustering analysis for peroxisomes from control, PEX26KO, GOLGA5KO, GOLGA8MKO, SEC61A2KO and SEC62KO cell lines. 9. Organelle contact analysis for mitochondria and peroxisomes in control, PEX26KO, GOLGA5KO, GOLGA8MKO, SEC61A2KO and SEC62KO cell lines.

Supplementary Table 3

1. Differential expression analysis for transcripts from PEX26KO, GOLGA5KO, GOLGA8MKO, SEC61A2KO and SEC62KO cell lines compared with controls. 2. Significantly enriched reactome pathways of significantly changing genes in PEX26KO, GOLGA5KO, GOLGA8MKO, SEC61A2KO and SEC62KO cell lines.

Supplementary Table 4

1. Log2-transformed fold change of proteins in PEX26KO, GOLGA5KO, GOLGA8MKO, SEC61A2KO and SEC62KO cells compared with controls. 2. Significantly enriched (FDR < 0.05) biological process GOs for significantly changed genes in PEX26KO, GOLGA5KO, GOLGA8MKO, SEC61A2KO and SEC62KO cell lines. 3. Common significantly changed genes across PEX26KO, GOLGA5KO, GOLGA8MKO, SEC61A2KO and SEC62KO cell lines. 4. Significantly enriched (FDR < 0.05) biological process GOs for common significantly changed genes across PEX26KO, GOLGA5KO, GOLGA8MKO, SEC61A2KO and SEC62KO cell lines. 5. Standard deviation of the log2-transformed fold change of genes that are part of the common significantly enriched GOs from tab 4. 6. Significantly changed proteins in mitochondrial pathways in PEX26KO, GOLGA5KO, GOLGA8MKO, SEC61A2KO and SEC62KO cell lines. 7. Significantly changed peroxisome, Golgi and ER proteins in PEX26KO, GOLGA5KO, GOLGA8MKO, SEC61A2KO and SEC62KO cell lines.

Supplementary Table 5

1. Lipids detected in whole-cell fractions from control, PEX26KO, GOLGA5KO, GOLGA8MKO, SEC61A2KO and SEC62KO cell lines. 2. Lipids detected in isolated mitochondrial fractions from control, PEX26KO, GOLGA5KO, GOLGA8MKO, SEC61A2KO and SEC62KO cell lines. 3. Lipids detected in whole-cell fractions from control, PEX26KO, GOLGA5KO, GOLGA8MKO, SEC61A2KO and SEC62KO cell lines treated with ethanol (vehicle control), 16:O-AG or 18:O-AG. 4. Lipids detected in isolated mitochondrial fractions from control, PEX26KO, GOLGA5KO, GOLGA8MKO, SEC61A2KO and SEC62KO cell lines treated with either ethanol (vehicle control) or 16:O-AG.

Supplementary Table 6

1. Total glycosaminoglycan abundances in control, GOLGA5KO and GOLGA8MKO cell lines. 2. N-glycan abundances in control, GOLGA5KO and GOLGA8MKO cell lines. 3. O-glycan abundances in control, GOLGA5KO and GOLGA8MKO cell lines.

Supplementary Table 7

Oligonucleotides used in this study.

Source data

Source Data Fig. 1

Cell morphology data.

Source Data Fig. 7

Respiration data.

Source Data Extended Data Fig. 1

Western blots.

Source Data Extended Data Fig. 2

Western blots.

Source Data Extended Data Fig. 3

SDS–PAGE gels.

Source Data Extended Data Fig. 3

Raw data for ATPlite mitochondrial DNA copy number quantitation and morphology.

Source Data Extended Data Fig. 5

FACS gating.

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Lee, R.G., Rudler, D.L., Raven, S.A. et al. Quantitative subcellular reconstruction reveals a lipid mediated inter-organelle biogenesis network. Nat Cell Biol 26, 57–71 (2024). https://doi.org/10.1038/s41556-023-01297-4

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