Therapeutic potential of mitochondrial transfer in reversing mutant-to-wild-type mtDNA ratio and improving mitochondrial dysfunction in 1555A>G mtDNA mutation-associated hearing loss

Mitochondrial DNA (mtDNA) mutations are a major cause of sensorineural hearing loss (SNHL). The m.1555A >G mutation in the mitochondrial 12S rRNA gene is closely linked to nonsyndromic and aminoglycoside-induced hearing loss, leading to impaired oxidative phosphorylation (OXPHOS) and ATP production. Current treatments focus on auditory rehabilitation without addressing mitochondrial pathology....

✦ Clinical Takeaway ✦

No actionable change — this is early-stage laboratory (in-vitro or preclinical) research; mitochondrial transfer as a therapy for m.1555A>G-related hearing loss is not ready for clinical application.

✦ Why It Matters ✦

Mitochondrial transfer represents a potentially transformative gene-correction strategy for inherited hearing loss, and proof-of-concept success could accelerate a new therapeutic class for currently untreatable genetic auditory conditions.

✦ Key Points ✦

01Targets the m.1555A>G mitochondrial DNA mutation, which causes aminoglycoside-induced (antibiotic-related) hearing loss.
02Mitochondrial transfer aimed to increase the ratio of healthy (wild-type) to mutant mtDNA in affected cells.
03Study evaluated improvement in mitochondrial function following the transfer.
04Published in Scientific Reports; likely in-vitro or preclinical model.
05Represents an early but novel step toward gene-level therapy for mitochondrial hearing loss.

✦ Claims & Evidence ✦

ClaimEvidenceSupport

Mitochondrial transfer can reverse the mutant-to-wild-type mtDNA ratio in m.1555A>G mutation-affected cells.

studypartially supported

Mitochondrial transfer improves mitochondrial dysfunction associated with m.1555A>G mutation-related hearing loss.

studypartially supported

✦ Research metadata ✦

PMID: 42115265
DOI: 10.1038/s41598-026-51402-4.
Journal: Scientific Reports
Publication type: research_article
Evidence level: 4
Population: Cell or animal models carrying the m.1555A>G mitochondrial DNA mutation associated with sensorineural hearing loss
Intervention: Mitochondrial transfer to correct mutant-to-wild-type mtDNA ratio

Primary outcomes

Change in mutant-to-wild-type mtDNA ratio; Improvement in mitochondrial function

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