What does this research mean for the field?

Mitochondrial S-adenosylmethionine (mitoSAM) import through SLC25A26 is a critical limiting factor for protein lipoylation during postnatal heart adaptation, and its deficiency causes metabolic vulnerability, delayed structural maturation, and early cardiomyopathy. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To investigate how mitochondrial S-adenosylmethionine cofactor availability via SLC25A26 regulates metabolic remodeling and growth in the postnatal heart.

August 28, 2026Science AdvancesOpen Access

Loss of the mitochondrial SAM transporter reveals a lipoylation-dependent metabolic vulnerability in the postnatal heart

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Authors

ARAnastasia RumyantsevaKarolinska Institutet TTTrevor S. TippettsChildren's Medical Center AWAlissa WilhalmKarolinska Institutet

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Implication

Preclinical genetic study reveals that mitochondrial SAM depletion impairs protein lipoylation and structural maturation in neonatal hearts, indicating a stage-specific metabolic vulnerability.

Key Points

To investigate how mitochondrial S-adenosylmethionine cofactor availability via SLC25A26 regulates metabolic remodeling and growth in the postnatal heart.
Assessed metabolic flux, mitochondrial gene expression, and respiratory chain activities following targeted Slc25a26 loss in neonatal cardiomyocytes.
Tracked cardiomyocyte cell-cycle progression, structural maturation markers, and the onset of cardiomyopathy in Slc25a26-deficient hearts.
Administered dietary medium-chain triglyceride supplementation during the suckling-to-weaning transition to determine if alternative metabolic substrates could rescue the phenotype.
Deletion of Slc25a26 selectively restricted protein lipoylation, suppressing pyruvate and α-ketoglutarate dehydrogenase flux, limiting tricarboxylic acid cycle carbon entry, and depleting aspartate and nucleotide pools.
Mitochondrial gene expression remained intact and respiratory chain enzyme activity was only partially reduced, demonstrating a hierarchical sensitivity that specifically targets lipoylation.
Metabolic disruption triggered persistent cardiomyocyte cell-cycle activity, delayed structural heart maturation, and early cardiomyopathy, which was partially mitigated by medium-chain triglyceride supplementation to prolong survival.

Cite This Study

Rumyantseva et al. (2026) studied this question.

synapsesocial.com/papers/6a91466cd15324a1df3aa03c https://doi.org/10.1126/sciadv.aeg8792

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Implication

Preclinical genetic study reveals that mitochondrial SAM depletion impairs protein lipoylation and structural maturation in neonatal hearts, indicating a stage-specific metabolic vulnerability.

Loss of the mitochondrial SAM transporter reveals a lipoylation-dependent metabolic vulnerability in the postnatal heart

Discussion

Member takes

Implication

Key Points

Cite This Study

Loss of the mitochondrial SAM transporter reveals a lipoylation-dependent metabolic vulnerability in the postnatal heart

Discussion

Member takes

Implication

Key Points

Cite This Study

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