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The official name of this gene is “succinate-CoA ligase, alpha subunit.”
SUCLG1 is the gene's official symbol. The SUCLG1 gene is also known by other names, listed below.
The SUCLG1 gene provides instructions for making one part, the alpha subunit, of an enzyme called succinate-CoA ligase. Two slightly different versions of this enzyme are made with the alpha subunit: ADP-forming succinate-CoA ligase (A-SUCL) and GDP-forming succinate-CoA ligase (G-SUCL). A-SUCL is most active in tissues that require a large amount of energy, such as those of the brain and muscles. G-SUCL is most active in other tissues, particularly in the liver and kidneys.
Both versions of succinate-CoA ligase play a critical role in mitochondria, which are structures inside cells that convert the energy from food into a form that cells can use. Within mitochondria, these enzymes are likely involved in a series of chemical reactions known as the citric acid cycle or Krebs cycle. These reactions allow cells to use oxygen and generate energy.
Mitochondria each contain a small amount of DNA, known as mitochondrial DNA or mtDNA. Studies suggest that succinate-CoA ligase interacts with another enzyme, nucleoside diphosphate kinase, to produce and maintain the building blocks of mitochondrial DNA. Having an adequate amount of mitochondrial DNA is essential for normal energy production within cells.
At least two mutations in the SUCLG1 gene have been identified in people with succinate-CoA ligase deficiency. One mutation has been found to cause a very severe form of the condition known as fatal infantile lactic acidosis. Children with this condition usually live only a few days after birth. The mutation responsible for fatal infantile lactic acidosis deletes a small amount of genetic material from the SUCLG1 gene, which completely eliminates the activity of both versions of succinate-CoA ligase.
At least one other SUCLG1 gene mutation results in a somewhat less severe form of succinate-CoA ligase deficiency that is characterized by very weak muscle tone (severe hypotonia), uncontrolled movements, hearing loss, and delayed development. This mutation changes a single protein building block (amino acid) in succinate-CoA ligase, which reduces but does not eliminate the activity of both A-SUCL and G-SUCL.
A shortage (deficiency) of succinate-CoA ligase leads to problems with the production and maintenance of mitochondrial DNA. A reduction in the amount of mitochondrial DNA (known as mitochondrial DNA depletion) impairs mitochondrial function in many of the body's cells and tissues. A total loss of succinate-CoA ligase activity appears to have more severe effects than a partial loss of enzyme activity.
Cytogenetic Location: 2p11.2
Molecular Location on chromosome 2: base pairs 84,423,522 to 84,459,461
The SUCLG1 gene is located on the short (p) arm of chromosome 2 at position 11.2.
More precisely, the SUCLG1 gene is located from base pair 84,423,522 to base pair 84,459,461 on chromosome 2.
See How do geneticists indicate the location of a gene? (http://ghr.nlm.nih.gov/handbook/howgeneswork/genelocation) in the Handbook.
You and your healthcare professional may find the following resources about SUCLG1 helpful.
You may also be interested in these resources, which are designed for genetics professionals and researchers.
See How are genetic conditions and genes named? (http://ghr.nlm.nih.gov/handbook/mutationsanddisorders/naming) in the Handbook.
acidosis ; ADP ; amino acid ; CoA ; coenzyme A ; deficiency ; depletion ; DNA ; enzyme ; gene ; hypotonia ; kinase ; lactic acidosis ; ligase ; mitochondria ; muscle tone ; mutation ; nucleoside ; oxygen ; protein ; subunit
You may find definitions for these and many other terms in the Genetics Home Reference Glossary (http://www.ghr.nlm.nih.gov/glossary).
The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? (http://ghr.nlm.nih.gov/handbook/consult/findingprofessional) in the Handbook.