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Mitochondria

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...

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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...

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Identification of Association Between Mitochondrial Dysfunction and Sarcopenia Using Summary-Data-Based Mendelian

Jiale Xie¹, Jinrong Hao², Xin Xu¹

¹Department of Joint Surgery, HongHui Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China.

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences

|January 18, 2025

Summary

This study identifies two mitochondrial genes, UQCC1 and ETFDH, genetically linked to sarcopenia. These findings highlight mitochondrial dysfunction

Keywords:

Bayesian colocalization analysis Mendelian randomization Mitochondrial dysfunction Sarcopenia Therapeutic targets

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Area of Science:

Genetics
Molecular Biology
Gerontology

Background:

Mitochondrial dysfunction is a key factor in sarcopenia, but its underlying mechanisms require further elucidation.
This research investigates the genetic links between mitochondrial function and sarcopenia using a Mendelian randomization approach.

Purpose of the Study:

To explore the genetic association between mitochondrial dysfunction and sarcopenia-related traits.
To identify specific mitochondrial genes implicated in the pathogenesis of sarcopenia.

Main Methods:

Utilized summary data from genome-wide association studies (GWASs) for sarcopenia traits (low hand grip strength, appendiceal lean mass, usual walking pace).
Employed summary-data-based Mendelian randomization (SMR) analysis integrating gene expression quantitative trait loci (eQTLs) data with GWAS data.
Validated findings using eQTLs data from skeletomuscular tissue.

Main Results:

Identified two mitochondrial genes, UQCC1 and ETFDH, with significant genetic associations with sarcopenia.
UQCC1 expression linked to increased risk of low hand grip strength and slower walking pace.
ETFDH expression associated with lower appendiceal lean mass and slower walking pace.
Results were robust and validated in skeletomuscular tissue.

Conclusions:

Confirmed a genetic link between UQCC1, ETFDH, and sarcopenia, underscoring the role of mitochondrial dysfunction.
These genes represent potential therapeutic targets for sarcopenia treatment.