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Mitochondrial biogenesis is the process by which cells increase mitochondrial numbers. [ 1 ] [ 2 ] It was first described by John Holloszy in the 1960s, when it was discovered that physical endurance training induced higher mitochondrial content levels, leading to greater glucose uptake by muscles. [ 3 ]
In humans, mitochondrial DNA (mtDNA) forms closed circular molecules that contain 16,569 [4] [5] DNA base pairs, [6] with each such molecule normally containing a full set of the mitochondrial genes. Each human mitochondrion contains, on average, approximately 5 such mtDNA molecules, with the quantity ranging between 1 and 15. [ 6 ]
MT-ND5 is located in mitochondrial DNA from base pair 12,337 to 14,148. [5] The MT-ND5 gene produces a 67 kDa protein composed of 603 amino acids. [ 9 ] [ 10 ] MT-ND5 is one of seven mitochondrial genes encoding subunits of the enzyme NADH dehydrogenase (ubiquinone) , together with MT-ND1 , MT-ND2 , MT-ND3 , MT-ND4 , MT-ND4L , and MT-ND6 .
PGC-1α provides a direct link between external physiological stimuli and the regulation of mitochondrial biogenesis, and is a major factor causing slow-twitch rather than fast-twitch muscle fiber types. [10] Endurance exercise has been shown to activate the PGC-1α gene in human skeletal muscle. [11]
MT-ND1 is located in mitochondrial DNA from base pair 3,307 to 4,262. [5] The MT-ND1 gene produces a 36 kDa protein composed of 318 amino acids. [10] [11] MT-ND1 is one of seven mitochondrial genes encoding subunits of the enzyme NADH dehydrogenase (ubiquinone), together with MT-ND2, MT-ND3, MT-ND4, MT-ND4L, MT-ND5, and MT-ND6.
This means that mitochondrial DNA disorders may occur spontaneously and relatively often. Defects in enzymes that control mitochondrial DNA replication (all of which are encoded for by genes in the nuclear DNA) may also cause mitochondrial DNA mutations. Most mitochondrial function and biogenesis is controlled by nuclear DNA.
PARGC1A gene key to weight loss. At the study’s conclusion, researchers found that participants in the exercise group who had the most “skinny genes” lost up to 5 kg (about 11 lbs) during ...
In the course of his postdoctoral work in the group of Gottfried Schatz at the Biocenter in Basel, Vestweber studied the biogenesis of mitochondria and found the first membrane component (today known as TOM 40) of the mitochondrial import machinery for the transport of proteins into this organelle.