Multiple mitochondrial DNA deletions in an elderly human individual

• Published in: FEBS letters 1992-02, Vol.297 (1), p.34-38
• Main Authors: Zhang, Chunfang, Baumer, Alessandra, Maxwell, Ronald J., Linnane, Anthony W., Nagley, Phillip
• Format: Article
• Language: English
• Subjects: Aged; Ageing; aging; base pairs; Base Sequence; Biological and medical sciences; Brain - metabolism; Chromosome Deletion; Classical genetics, quantitative genetics, hybrids; deletion; DNA; DNA deletion; DNA, Mitochondrial - genetics; Female; Fundamental and applied biological sciences. Psychology; Genetics of eukaryotes. Biological and molecular evolution; Human; Humans; kilobase pairs; Mitochondrial DNA; Molecular Sequence Data; mtDNA; Muscles - metabolism; Myocardium - metabolism; PCR; Polymerase Chain Reaction; Somatic gene mutation
• ISSN: 0014-5793; 1873-3468
• DOI: 10.1016/0014-5793(92)80321-7

We have used the polymerase chain reaction (PCR) to study deletions in the mitochondrial DNA (mtDNA) of an elderly human individual. An extended set of PCR primers has been utilised to identify 10 mitochondrial DNA deletions in a 69-year-old female subject with no known mitochondrial disease. The particular deletions visualised as PCR products depended on the primer pairs used, such that the more distantly separated PCR primers enabled visualisation of larger deletions. Some deletions were common to the heart, brain and skeletal muscle, whereas others were apparently specific to individual tissues. DNA sequencing analysis of PCR products showed that short direct repeat sequences (5 to 13 bp) flanked all deletion breakpoints; in most cases one copy of the repeat was deleted. It is proposed that the accumulation of such multiple deletions is a general phenomenon during the ageing process.