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Mitochondrial DNA and Genetic Disease

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Mitochondrial DNA and Genetic Disease Arch Dis Child: first published as 10.1136/adc.63.8.883 on 1 August 1988. Downloaded from Archives of Disease in Childhood, 1988, 63, 883-885 Mitochondrial DNA and genetic disease Mitochondrial DNA (mtDNA) became news a few expression of a maternally transmitted antigen months ago when a publication in Nature announced (MTA), is dependent on a variant mtDNA although that we may all be descended from a single African the mechanism by which it interacts with this nuclear woman who lived 200 000 years ago.' The gene encoding the protein antigen is obscure.8) 'mitochondrial African Eve' hypothesis is based on Likely human diseases include the mitochondrial the fact that mitochondria are strictly maternally myopathies, Leber's optic neuropathy, congenital inherited, and the accumulation of mutations can be myotonic dystrophy, and chloramphenicol induced used as a genetic clock.2 aplastic anaemia. These criteria exclude a large But mtDNA should not just remain the province number of conditions where nuclear encoded of evolutionary biologists, feminists, and religious mitochondrial enzymes may be affected such as fundamentalists. To paediatricians it offers an ex- Leigh's encephalopathy, where inheritance is prob- planation for maternal inheritance patterns in ably recessive. human disease, as an individual's mitochondria are A familiar alternative explanation for maternal inherited exclusively from the mother. For example, inheritance is a transplacental biochemical factor, as mitochondrial mutations could cause some types of occurs in transient neonatal myaesthenia gravis. mitochondrial myopathy,3 Leber's optic neuro- Although this could explain the initial improvement pathy,4 and could influence the clinical manifesta- in congenital myotonic dystrophy it does not explain tions of congenital myotonic dystrophy5 and the persistent developmental delay nor why non- neurofibromatosis.6 myotonic offspring are unaffected, nor the progres- sive degeneration in Leber's and mitochondrial The mitochondrial genome: 'small is beautiful' myopathy. While a biological transplacentally transmitted factor such as a slow virus could explain Mitochondria are intracellular organelles which are prolonged effects, there is no supporting epidemio- key elements in oxidative phosphorylation. Their inner membrane binds the four complexes of the electron transport chain and adenosine triphosphate http://adc.bmj.com/ synthase (complexes I to V respectively). Mitochon- dria are the only source of extranuclear DNA in man, and each one contains two to 10 copies of a circular piece of DNA, which compactly encodes a minority of the RNAs and proteins the mitochon- drion needs to funttion (figure).7 The billions of molecules of mtDNA in an individual are usually all identical, and inherited from the mother. This is on September 27, 2021 by guest. Protected copyright. presumably because the sperm contributes almost no cytoplasm to the zygote. A disease caused by a mutation in mtDNA would therefore be maternally inherited. Characteristics to be expected of diseases caused by mitochondrial mutations A disease caused by a mitochondrial mutation might have exclusively maternal transmission, a high proportion of offspring affected or transmitting the ATPase8 disease with in X linked (compared 50% disorders), Figure The human mitochondrial genome. COI to COIII: and a biochemical defect in an enzyme with subunits I to 3 ofcytochrome C oxidase; NDI to ND6, and mitochondrially encoded subunits. (The absence of ND4L: subunits 1 to 6 and 4L ofNADH-dehydrogenase; the latter point does not exclude a causative A TPase 6 and 8: subunits 6 and 8 ofH+ -A TPase; Cyt b: mitochondrial mutation. For example, in mice the apocytochrome B; O:transfer RNAs. 883 Arch Dis Child: first published as 10.1136/adc.63.8.883 on 1 August 1988. Downloaded from 884 Poulton logical nor histological evidence. Alternatively, condition caused by a mutation on chromosome mitochondria might malfunction because of a 19.2) Although most cases present in adult life, nuclear mutation, causing male sterility due to the around 10% are symptomatic in the neonatal period high energy requirements of the sperm. Finally, with hypotonia, poor suck, respiratory problems, there is new evidence for 'imprinting' nuclear DNA and mental retardation. In these cases the mother is according to its parent of origin.9 nearly always the affected parent.5 This could be explained by a transplacental factor. Alternatively Mitochondrial myopathies some part of the mitochondrial genome could interact with the chromosome 19 defect, and the The mitochondrial myopathies are a heterogenous neonatal presentation occur only when both are group of rare disorders often associated with defects present. in the electron transport chain. They are character- ised by abnormal mitochondria on muscle biopsy. Chloramphenicol induced asplastic anaemia However, clinical manifestations are not confined to skeletal muscle. Patients may present in the neona- tal period with lactic acidosis, generalised weakness, Chloramphenicol is known to inhibit mitochondrial and the Fanconi syndrome"( or later in childhood protein synthesis, and resistance is associated with a and early adult life with Kearn's Sayre syndrome,"' point mutation in the DNA coding for the 16s myoclonic epilepsy and ragged red fibres rRNA, the hypothetical binding site.2' A mutation (MERRF),3 or mitochondrial encephalomyopathy in the binding site might predispose to chloramphe- lactic acidosis with stroke-like episodes (MELAS).1' nicol induced aplastic anaemia. Although pedigrees These clinical groups have limited nosological use- are consistent with maternal inheritance, however, fulness, however, as there is a range of disease and familial cases are too rare for certainty.22 23 considerable variability even within a family. 12 Moreover, the biochemistry does not clearly parallel Ways of looking for mifochondrial mutations the clinical classification. 13 Although most cases are sporadic, maternal inheritance is frequent in familial An altered mitochondrially encoded protein pro- cases,'3 14 and one large family with eight affected duct, or more directly an analysis of the DNA itself members has been described in which autosomal could show a mitochondrial mutation. Most patients dominant and X linked inheritance was extremely with mitochondrial myopathy appear to have improbable.3 While there are few families in which normal mitochondrial proteins or a generalised 100% of offspring are clearly affected, subclinical reduction.24 One case has been shown to have http://adc.bmj.com/ involvement has been described.3 It follows that reduced levels of a single mitochondrially encoded mitochondrial mutations may well be causative in a peptide.2' proportion of these families. Gross alterations in mtDNA can be investigated by detection of restriction fragment length Leber's optic neuropathy polymorphisms26: subtle mutations such as single base changes, short insertions or deletions require Leber's optic neuropathy causes blindness with optic DNA sequencing. So far, restriction mapping of atrophy in adolescents and young adults, 15 and patients with mitochondrial myopathy27 28 and Le- on September 27, 2021 by guest. Protected copyright. should not be confused with Leber's amaurosis ber's optic neuropathy29 has not shown any such (retinal degeneration with visual loss in infants).'6 major DNA changes in DNA from white cells. A It is exclusively maternally inherited, with a recent unconfirmed report, however, suggests that male:female ratio of 7:1 and around 80% of there may be deletions of up to 7kb in muscle daughters becoming asymptomatic carriers.4 The mtDNA in a proportion of patients with mitochon- biochemical basis is not well established, but some drial myopathy. studies implicate rhodanese.17 Histology occasion- Thus far there is no published mtDNA sequence ally shows similarities with mitochondrial myop- data for mitochondrial myopathy, Leber's optic athy.18 19 It therefore partly fulfills the criteria neuropathy or myotonic dystrophy, although work is for a mitochondrial disease, but if so, interactions of currently in progress. Sequence data on one patient mitochondrial and nuclear gene products are in- with chloramphenicol induced aplastic anaemia volved (see discussion of mouse MTA above). shows a point mutation which could interact with chloramphenicol binding.23 As this is present in a Congenital myotonic dystrophy higher proportion of the normal population than are sensitive to chloramphenicol induced aplasia, its Myotonic dystrophy is an autosomal dominant importance is uncertain. Arch Dis Child: first published as 10.1136/adc.63.8.883 on 1 August 1988. Downloaded from Mitochondrial DNA and genetic disease 885 Conclusion 13 Petty RKH, Harding AE, Morgan-Hughes JA. The clinical features of mitochondrial myopathy. Brain 1986;109:915-38. 4 Egger J, Wilson J. Mitochondrial inheritance in a mitochondri- Maternally inherited diseases could be caused by ally mediated disease. N Engl J Med 1983;309:142-6. mutations in the mitochondrial genome. Some of '- Lundsgaard R. Leber's disease: a genealogic, genetic and the mitochondrial myopathies are probably exam- clinical study of 101 cases of retrobulbar optic neuritis in 20 ples of this, and perhaps Leber's optic neuropathy Danish families. Acta Ophthalmol (Copenh) 1984;22(suppl 21): 1-306. and susceptibility to chloramphenicol induced aplas- 16 Hosking G. Visually evoked responses. Arch Dis Child tic anaemia. Other diseases whose phenotype
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