genetic cause of mitochondrial disorder arising from the incompatibility of common, nonpathogenic mtDNA variants 2022

[pattismith]

Combination of common mtDNA variants results in mitochondrial dysfunction and a connective tissue dysregulation (pnas.org)

Mitochondrial dysfunction can be associated with a range of clinical manifestations. Here, we report a family with a complex phenotype including combinations of connective tissue, neurological, and metabolic symptoms that were passed on to all surviving children.

Analysis of the maternally inherited mtDNA revealed a novel genotype encompassing the haplogroup J - defining mitochondrial DNA (mtDNA) ND5 m.13708G>A (A458T) variant arising on the mtDNA haplogroup H7A background, an extremely rare combination.

Analysis of transmitochondrial cybrids with the 13708A-H7 mtDNA revealed a lower mitochondrial respiration, increased reactive oxygen species production (mROS), and dysregulation of connective tissue gene expression.

The mitochondrial dysfunction was exacerbated by histamine, explaining why all eight surviving children inherited the dysfunctional histidine decarboxylase allele (W327X) from the father.

Thus, certain combinations of common mtDNA variants can cause mitochondrial dysfunction, mitochondrial dysfunction can affect extracellular matrix gene expression, and histamineactivated mROS production can augment the severity of mitochondrial dysfunction. Most important, we have identified a previously unreported genetic cause of mitochondrial disorder arising from the incompatibility of common, nonpathogenic mtDNA variants

Family Harbors a Dysfunctional mtDNA Variant.
We evaluated, assembled, and summarized the clinical data for the twogeneration pedigree.
The mother and all children present with various combinations of connective tissue manifestations, including Chiari malformation, cranial–cervical instability, hypermobility of joints, skin herniation, wound dehiscence, aortic valve disease, ankylosing spondylitis, fatigability, diabetes, and dysautonomic manifestations (SI Appendix).
The apparent matrilineal transmission of this complex array of clinical manifestations in all eight surviving offspring suggested an mtDNA disorder.

 

[linusbert]

good thing, but how to test for mtDNA? i got multiple normal gene tests also some WGS. but how to check for this and how to analyse it?

and how to treat it?

 

[pattismith]

good thing, but how to test for mtDNA? i got multiple normal gene tests also some WGS. but how to check for this and how to analyse it?

and how to treat it?

Do you see any symptoms showing up in your maternal line?
If so, looking in mitochondrial DNA variants or mutations may help understanding the disease.
However, there is not a simple treatment for mitochondrial disease.

Everything that reduce oxydative stress and improve mitochondrial respiration can help, sometimes ketogenic diet...

 

[SWAlexander]

how to check for this and how to analyse it?

If you have direct access to your DNA or Promethease report check for the:
Seven oxidative stress genes were found to be upregulated in whole blood and lung autopsies (MPO, S100A8, S100A9, SRXN1, GCLM, SESN2, and TXN); these genes were higher in severe versus non-severe COVID-19 leucocytes.

Reference:
Upregulation of oxidative stress gene markers during SARS-COV-2 viral infection
https://www.sciencedirect.com/science/article/pii/S089158492100383X