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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchIn humans, mitochondrial DNA (mtDNA) is usually inherited from the mother: the egg contributes the mitochondria to the developing embryo. Sons and daughters can both inherit mtDNA variants, but under the usual pattern neither passes them on through mtDNA to their children. Rare reports of paternal mtDNA inheritance remain contested and do not change the standard rule.
What maternal inheritance means
mtDNA is the small genome found in mitochondria, the structures that help cells produce energy. Because the egg supplies the embryo’s mitochondria, a mother can pass mtDNA variants to children of any sex. Under the usual human pattern, fathers do not pass their mtDNA variants to their children. MedlinePlus Genetics summarizes this pattern by explaining that only egg cells contribute mitochondria to the developing embryo, so only females can pass mitochondrial variants to their children: MedlinePlus Genetics: inheritance patterns.
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This rule applies specifically to genes in mtDNA. Many proteins that work in mitochondria are encoded by nuclear DNA, which is inherited from both parents. A condition affecting mitochondrial function can therefore follow a nuclear inheritance pattern rather than maternal mtDNA inheritance.
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Why relatives with the same mtDNA variant may be affected differently
A person may have a mixture of mtDNA sequences, a state called heteroplasmy. The proportion of a variant can differ among people, tissues, and generations, and may shift over time. A pathogenic variant’s proportion can be relevant to whether a person is affected and how severely, but heteroplasmy by itself does not mean someone has a disorder. The effect depends on the variant and its distribution, among other factors. A family tree alone cannot predict an individual’s symptoms or outcome. Wei and Chinnery’s 2020 review discusses how variable heteroplasmy can shape disease expression.
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Can mitochondrial DNA come from the father?
Under the usual human pattern, paternal mtDNA is not transmitted. A 2018 study by Luo and colleagues proposed biparental inheritance in three unrelated multigenerational families. In those families, the authors reported heteroplasmy values ranging from 24% to 76% among 17 individuals. That range describes the selected people in that study; it is not a population frequency or evidence that paternal transmission is a common route. Luo et al., 2018.
One alternative explanation is a NUMT: an mtDNA-like sequence that has become part of nuclear DNA. Since nuclear DNA comes from both parents, a paternal NUMT can resemble paternal mtDNA in some genetic analyses. Wei and Chinnery’s 2020 review describes a whole-genome sequencing analysis of 11,035 parent–child trios in which a similar signature appeared in seven and was attributed as likely to paternally transmitted NUMTs. This is the interpretation of that study’s observed signatures, not a rate of paternal mtDNA inheritance. The review concludes that paternal transmission in humans seems highly unlikely and, if it occurs, must be exceptionally rare.
A later review revisiting the question says that studies using complementary techniques do not support paternal mtDNA transmission and highlights co-amplification of rare, concatenated nuclear mtDNA segments as a possible technical explanation for earlier observations. This is the authors’ synthesis, not a final resolution of every possible rare case. Pagnamenta et al., “Biparental inheritance of mitochondrial DNA revisited”. The sources reviewed here establish no population-level frequency for genuine paternal mtDNA inheritance in humans.
How inheritance patterns differ across organisms
Maternal inheritance predominates across eukaryotes, but other organisms have different systems. These include paternal leakage, biparental inheritance, strict paternal inheritance, and doubly uniparental inheritance. Breton et al., 2015, reviews these atypical patterns. They are important in evolutionary biology, but examples from other species do not show that human mtDNA is generally inherited from both parents.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What this means for a family
This guide describes the usual inheritance pattern; it cannot estimate the risk for a particular person or family. Interpretation depends on the specific variant, genetic findings, and clinical context. A genetics professional or clinician can help assess those details, including whether a condition involves mtDNA or a nuclear gene affecting mitochondria.
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