The “New” Roots of our Friends the Mitochondria

Mitochondria, the proverbial “powerhouse” of the cell, mitochondria is found in virtually all eukaryotic cells, plant, or animal. Scientists thought that was pretty much the end of the story of our little friend. It was not a great explanation, but it was an explanation. Now new research is turning the idea– that our ancestor cells simply “swallowed up” bacterial cells that eventually became mitochondria– on its head.

The new research suggests that parasitic bacteria were the first cousins of the mitochondria that power cells in animals and plants – first acted as energy parasites in those cells before becoming beneficial. The study used next-generation DNA sequencing technologies to decode the genomes of 18 bacteria that are close relatives of mitochondria.

The new research provides an alternative theory to two current theories of how simple bacterial cells were swallowed up by host cells and ultimately became mitochondria. Now for those of you rusty on cell biology, mitochondria power the cells by providing them with adenosine triphosphate, or ATP, which is considered by biologists to be the energy currency of life.

The origin of mitochondria began about 2 billion years ago and is one of the seminal events in the evolutionary history of life. However, little is known about the circumstances surrounding its origin, and that question is considered an enigma in modern biology.

“We believe this study has the potential to change the way we think about the event that led to mitochondria,” said biologist Martin Wu, the study’s lead author. “We are saying that the current theories – all claiming that the relationship between the bacteria and the host cell at the very beginning of the symbiosis was mutually beneficial – are likely wrong.”

“Instead, we believe the relationship likely was antagonistic – that the bacteria were parasitic and only later became beneficial to the host cell by switching the direction of the ATP transport.”

The finding is a new insight into an event in the early history of life on Earth that ultimately led to the diverse eukaryotic life we see today. Without mitochondria to provide energy to the rest of a cell, there could not have evolved such amazing biodiversity.

“We reconstructed the gene content of mitochondrial ancestors, by sequencing DNAs of its close relatives, and we predict it to be a parasite that actually stole energy in the form of ATP from its host – completely opposite to the current role of mitochondria,” Wu said.

In his study, the team also identified many human genes that are derived from mitochondria – identification of which has the potential to help understand the genetic basis of human mitochondrial dysfunction that may contribute to several diseases, including Alzheimer’s disease, Parkinson’s disease and diabetes, as well as aging-related diseases.

In addition to the basic essential role of mitochondria in the functioning of cells, the DNA of mitochondria is used by scientists for DNA forensics, genealogy and tracing human evolutionary history. In other words, besides the obvious health implications this new research can help us trace our roots and better solve where exactly we came from, an exciting prospect indeed.

Still a little fuzzy on mitochondria? Well this video probably won’t help that, but it is pretty dang cool if I do say so myself.

Sources:

Zhang Wang, & Martin Wu (2014). Phylogenomic Reconstruction Indicates Mitochondrial Ancestor Was an Energy Parasite

PLoS ONE : 10.1371/journal.pone.0110685