Summary of study ST001246

This data is available at the NIH Common Fund's National Metabolomics Data Repository (NMDR) website, the Metabolomics Workbench, https://www.metabolomicsworkbench.org, where it has been assigned Project ID PR000833. The data can be accessed directly via it's Project DOI: 10.21228/M8110J This work is supported by NIH grant, U2C- DK119886.

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Study IDST001246
Study TitleTFPa/HADHA is required for fatty acid beta-oxidation and cardiolipin re-modeling in human cardiomyocytes (part-I)
Study SummaryMitochondrial trifunctional protein deficiency, due to mutations in hydratase subunit A (HADHA), results in sudden infant death syndrome (SIDS) with no cure. To reveal the disease etiology, we generated stem cell-derived cardiomyocytes from HADHA-deficient hiPSCs and accelerated their maturation via a novel, engineered MicroRNA Maturation Cocktail (MiMaC) that upregulated the epigenetic regulator, HOPX. Fatty acid challenged MiMaC treated HADHA mutant cardiomyocytes manifested the disease phenotype: defective calcium dynamics and repolarization kinetics which resulted in a pro-arrhythmic state. Single cell RNA-seq revealed a novel cardiomyocyte developmental intermediate, based on metabolic gene expression. This intermediate gave rise to mature-like cardiomyocytes in control cells but, mutant cells transitioned to a pathological state with reduced fatty acid beta-oxidation (FAO), reduced mitochondrial proton gradient, disrupted cristae structure and defective cardiolipin remodeling. This study reveals that TFPa/HADHA, a MLCL-AT-like enzyme, is required for FAO and cardiolipin remodeling, essential for functional mitochondria in human cardiomyocytes.
Institute
University of California, Davis
Last NameShowalter
First NameMegan
AddressUC Davis Genome Center, room 1313, 451 Health Sci Drive
Emailmshowalter@ucdavis.edu
Phone5307529922
Submit Date2019-08-26
Raw Data AvailableYes
Raw Data File Type(s).raw
Analysis Type DetailLC-MS
Release Date2019-09-06
Release Version1
Megan Showalter Megan Showalter
https://dx.doi.org/10.21228/M8110J
ftp://www.metabolomicsworkbench.org/Studies/ application/zip

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Sample Preparation:

Sampleprep ID:SP001322
Sampleprep Summary:1 million cells were extracted with 225 µl of methanol at −20°C containing an internal standard mixture of PE(17:0/17:0), PG(17:0/17:0), PC(17:0/0:0), C17 sphingosine, ceramide (d18:1/17:0), SM (d18:0/17:0), palmitic acid-d3, PC (12:0/13:0), cholesterol-d7, TG (17:0/17:1/17:0)-d5, DG (12:0/12:0/0:0), DG (18:1/2:0/0:0), MG (17:0/0:0/0:0), PE (17:1/0:0), LPC (17:0), LPE (17:1), and 750 µL of MTBE (methyl tertiary butyl ether) (Sigma Aldrich) at −20°C containing the internal standard cholesteryl ester 22:1. Cells were vortexed for 20 sec, sonicated for 5 min and shaken for 6 min at 4°C with an Orbital Mixing Chilling/Heating Plate (Torrey Pines Scientific Instruments). Then 188 µl of LC-MS grade water (Fisher) was added. Samples were vortexed, centrifuged at 14,000 rcf (Eppendorf 5415D). The upper (non-polar, organic) phase was collected in two 350 µL aliquots and evaporated to dryness.
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