Dominant Transmission Observed in Adolescents and Families With Orthostatic Intolerance.

TitleDominant Transmission Observed in Adolescents and Families With Orthostatic Intolerance.
Publication TypeJournal Article
Year of Publication2017
AuthorsPosey, JE, Martinez, R, Lankford, JE, Lupski, JR, Numan, MT, Butler, IJ
JournalPediatr Neurol
Date Published2017 Jan
KeywordsAdolescent, Cohort Studies, Family, Female, Genetic Testing, Humans, Male, Orthostatic Intolerance, Pedigree, Posture, Surveys and Questionnaires, Tilt-Table Test

BACKGROUND: Orthostatic intolerance is typically thought to be sporadic and attributed to cerebral autonomic dysfunction. We sought to identify families with inherited autonomic dysfunction manifest as symptomatic orthostatic intolerance to characterize mode of inheritance and clinical features.METHODS: Sixteen families with two or more first- or second-degree relatives with autonomic dysfunction and orthostatic intolerance were enrolled. A clinical diagnosis of autonomic dysfunction defined by symptomatic orthostatic intolerance diagnosed by head-up tilt table testing was confirmed for each proband. Clinical features and evaluation were obtained from each proband using a standardized intake questionnaire, and family history information was obtained from probands and available relatives.RESULTS: Comprehensive pedigree analysis of 16 families (39 individuals with orthostatic intolerance and 40 individuals suspected of having orthostatic intolerance) demonstrated dominant transmission of autonomic dysfunction with incomplete penetrance. Affected individuals were predominantly female (71.8%, 28/39; F:M, 2.5:1). Male-to-male transmission, although less common, was observed and demonstrated to transmit through unaffected males with an affected parent. Similar to sporadic orthostatic intolerance, probands report a range of symptoms across multiple organ systems, with headaches and neuromuscular features being most common.CONCLUSIONS: Familial occurrence and vertical transmission of autonomic dysfunction in 16 families suggest a novel genetic syndrome with dominant transmission, incomplete penetrance, and skewing of the sex ratio. Elucidation of potential genetic contributions to orthostatic intolerance may inform therapeutic management and identification of individuals at risk. Adolescent evaluation should include identification and treatment of potential at-risk relatives.

Alternate JournalPediatr Neurol
PubMed ID27773421
PubMed Central IDPMC5209259
Grant ListT32 GM007526 / GM / NIGMS NIH HHS / United States
U54 HG006542 / HG / NHGRI NIH HHS / United States

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