Abstract:
:Hereditary paraganglioma type 1 (PGL1) is characterized by slow-growing and vascularized tumors that often develop in the carotid body (CB) and is caused by mutations in the gene for succinate dehydrogenase D ( SDHD) of mitochondrial complex II. The mechanisms of tumorigenesis and the factors affecting penetrance and expressivity are unknown. Because chronic hypoxic stimulation at high altitudes causes sporadic CB paragangliomas, it has been hypothesized that the SDHD gene product may be involved in oxygen sensing. On this background, we examined genotype-phenotype-environment relationships and tested whether higher altitudes adversely affect the phenotype in PGL1. An analysis of 58 subjects from 23 families revealed that nonsense/splicing mutation carriers developed symptoms 8.5 years earlier than missense mutation carriers ( P<0.012). We also found that subjects who were diagnosed with single tumors at their first clinical evaluation lived at lower average altitudes and were exposed to lower altitude-years than those with multiple tumors ( P<0.012). Pheochromocytomas developed in six subjects (approximately 10%), five of whom had nonsense mutations ( P=0.052). Subjects with pheochromocytomas also lived at higher average altitudes and were exposed to higher altitude-years than those without them ( P=0.026). To test whether altitude is also associated with the more frequent detection of germ-line founder mutations among sporadic cases in The Netherlands than in the USA ( P=0.00033), we calculated population-weighted elevations of the two countries. We found that the population-weighted elevations were approximately 260 m for the US and 2 m for the central-western Netherlands ( P~0), where three Dutch founder mutations were discovered. This finding suggests that low altitudes in The Netherlands reduce penetrance and relax the natural selection on SDHD mutations. Collectively, these data suggest that higher altitudes and nonsense/splicing mutations are associated with phenotypic severity in PGL1 and support the hypothesis that SDHD mutations impair oxygen sensing.
journal_name
Hum Genetjournal_title
Human geneticsauthors
Astrom K,Cohen JE,Willett-Brozick JE,Aston CE,Baysal BEdoi
10.1007/s00439-003-0969-6keywords:
subject
Has Abstractpub_date
2003-08-01 00:00:00pages
228-37issue
3eissn
0340-6717issn
1432-1203journal_volume
113pub_type
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