SLC30A9 (Zinc Transporter 9, ZnT9) is a member of the SLC30 family that has been recently characterized as a mitochondrial zinc transporter[@zhang2024]. Unlike other ZnT family members that primarily localize to the Golgi, ZnT9 is predominantly mitochondrial, where it plays essential roles in mitochondrial zinc homeostasis and function[@csatary2021].
Function
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SLC30A9 — Solute Carrier Family 3 Member 0A9 (SLC30A9)
SLC30A9 (Zinc Transporter 9, ZnT9) is a member of the SLC30 family that has been recently characterized as a mitochondrial zinc transporter[@zhang2024]. Unlike other ZnT family members that primarily localize to the Golgi, ZnT9 is predominantly mitochondrial, where it plays essential roles in mitochondrial zinc homeostasis and function[@csatary2021].
Function
ZnT9 functions as a mitochondrial zinc transporter with several critical functions:
Mitochondrial zinc regulation: Controls zinc import into mitochondria, essential for mitochondrial function[@zhang2024]
Early embryonic development: SLC30A9 is essential for mammalian early embryonic development[@zhang2024]
Oxidative stress response: Loss of SLC30A9 increases sensitivity to oxidative stress[@borgmann2022]
Gene expression regulation: Acts as a transcriptional regulator through PRDM1-mediated overexpression[@wu2024]
Role in Neurodegeneration
ZnT9's mitochondrial localization makes it particularly relevant to neurodegenerative diseases, which are often characterized by mitochondrial dysfunction:
Mitochondrial dysfunction: ZnT9 deficiency impairs mitochondrial function, a hallmark of neurodegeneration
Oxidative stress: Increased sensitivity to oxidative stress in ZnT9-deficient cells[@borgmann2022]
Cerebro-renal syndrome: SLC30A9 mutations cause a novel cerebro-renal syndrome with neurological manifestations[@major2017]
Clinical Significance
SLC30A9 mutations cause a novel cerebro-renal syndrome characterized by:
Neurological abnormalities
Renal dysfunction
Zinc homeostasis disruption[@major2017]
Additionally, PRDM1-driven SLC30A9 overexpression has been linked to malignant phenotypes in cervical cancer cells[@wu2024].
Expression in Menopause
Studies have shown that ZnT9 expression is decreased in vaginal tissues of menopausal women, suggesting a role in age-related zinc homeostasis changes[@zhang2022].
Evolutionary Conservation
Evolutionary rate covariation analysis has identified SLC30A9 (ZnT9) as a mitochondrial zinc transporter, conserved across mammals[@csatary2021]. Studies in C. elegans have confirmed the evolutionary conservation of SLC30A9 function in oxidative stress response[@borgmann2022].
Key Publications
SLC30A9 is an evolutionarily conserved mitochondrial zinc transporter essential for early embryonic development[@zhang2024].
Evolutionary rate covariation identifies SLC30A9 as a mitochondrial zinc transporter[@csatary2021].
A mutation in SLC30A9 causes increased sensitivity to oxidative stress in C. elegans[@borgmann2022].
[Zhang et al, SLC30A9: an evolutionarily conserved mitochondrial zinc transporter essential for mammalian early embryonic development (2024)](https://pubmed.ncbi.nlm.nih.gov/39158587/)
[Csatary et al, Evolutionary rate covariation identifies SLC30A9 (ZnT9) as a mitochondrial zinc transporter (2021)](https://pubmed.ncbi.nlm.nih.gov/34397090/)
[Borgmann et al, A mutation in SLC30A9, a zinc transporter, causes increased sensitivity to oxidative stress in Caenorhabditis elegans (2022)](https://pubmed.ncbi.nlm.nih.gov/36244116/)
[Wu et al, PRDM1-driven SLC30A9 overexpression contributes to malignant phenotype of cervical cancer cells (2024)](https://pubmed.ncbi.nlm.nih.gov/41419464/)
[Major et al, SLC30A9 mutation affecting intracellular zinc homeostasis causes a novel cerebro-renal syndrome (2017)](https://pubmed.ncbi.nlm.nih.gov/28334855/)
[Zhang et al, Zinc Transporter 9 (SLC30A9) Expression Is Decreased in the Vaginal Tissues of Menopausal Women (2022)](https://pubmed.ncbi.nlm.nih.gov/33409913/)