Key Points
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Cardiac myxomas and various non-cardiac neoplasms occur in people who have the autosomal-dominant disorder Carney complex, which is also characterized by spotty pigmentation of the skin and endocrinopathy.
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Although complete penetrance is the rule, Carney complex shows a highly variable phenotype.
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Mutations in the chromosome 17q PRKAR1A gene, which encodes the regulatory R1α subunit of protein kinase A (PKA), cause Carney complex in approximately two-thirds of affected individuals. No genotype–phenotype correlation has been established, and most mutations result in PRKAR1A haploinsufficiency through nonsense-mediated degradation of the transcribed, mutant mRNAs.
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The contributions of loss of heterozygosity of PRKAR1A and increased PKA activity to Carney complex are unclear. Although both can occur in Carney complex tumours, analyses of human and murine tissues demonstrate that neither is required for tumorigenesis.
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Changes in the ratio of type I to type II PKA isoenzymes are uniform features of human Carney complex tumours, as well as tumours that are found in genetically engineered mouse models of Carney complex. Such PKA isoform switching might mediate altered cell growth and tumorigenesis.
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Mutation of the chromosome 17p MYH8 gene, which encodes perinatal myosin, results in a rare familial cardiac myxoma syndrome with features that are typical of Carney complex, except that affected individuals also suffer from the hereditary distal arthrogryposis syndrome, trismus–pseudocamptodactyly.
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The mechanism by which PRKAR1A and MYH8 mutations foster the survival and proliferation of myxoma progenitor cells in the heart remains unknown.
Abstract
Carney complex is a genetic condition in which affected individuals develop benign tumours in various tissues, including the heart. Most individuals with Carney complex have a mutation in the PRKAR1A gene, which encodes the regulatory R1α subunit of protein kinase A — a significant component of the cyclic-AMP signalling pathway. Genetically engineered mutant Prkar1a mouse models show an increased propensity to develop tumours, and have established a role for R1α in initiating tumour formation and, potentially, in maintaining cell proliferation. Ongoing investigations are exploring the intersection of R1α-dependent cell signalling with other gene products such as perinatal myosin, mutation of which can also cause cardiac myxomas.
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Acknowledgements
This work was supported by the Michael Wolk Heart Foundation (C.T.B.), the Snart Cardiovascular Fund (C.T.B.) and the Hellenic Society of Cardiology (K.C.). C.T.B. is an Established Investigator of the American Heart Association and an Irma T. Hirschl Scholar.
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Glossary
- Autosomal-dominant
-
Autosomal-dominant inheritance refers to genetic conditions that occur when a mutation is present in one copy of a given gene (in other words, the person is heterozygous).
- Myxomas
-
A benign neoplasm of small stellate cells against an extensive proteoglycan background.
- Endocrinopathy
-
A disorder that affects the function of an endocrine gland.
- Trichofolliculoma
-
A usually solitary tumour in which multiple abortive hair follicles open into a central cyst or space opening on the skin surface.
- Lentigines
-
Benign brown pigmented macule with microscopic rete ridge proliferation.
- Cushing syndrome
-
A disorder that results from increased adrenocortical secretion of cortisol.
- Acromegaly
-
Endocrine disorder that is marked by progressive enlargement of peripheral parts of the body, especially the head, face, hands and feet, owing to excessive secretion of somatotropin.
- Trismus–pseudocamptodactyly syndrome
-
Rare inherited disorder that is characterized by the inability to completely open the mouth (trismus) and/or the presence of abnormally short muscle-tendon units in the hands and feet, causing the digits to curve or bend when the hand or foot is dorsiflexed.
- Plasticity of ocular dominance
-
Similar to handedness, people usually have a dominant right or left eye — this is referred to as ocular dominance. In some circumstances, this can be modified by genetic and/or environmental factors (plasticity).
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Wilkes, D., Charitakis, K. & Basson, C. Inherited disposition to cardiac myxoma development. Nat Rev Cancer 6, 157–165 (2006). https://doi.org/10.1038/nrc1798
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DOI: https://doi.org/10.1038/nrc1798
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