The phenotypic patterns of essential hypertension are the key to identifying "high blood pressure" genes

Title:

The phenotypic patterns of essential hypertension are the key to identifying "high blood pressure" genes

Creator:

Paul I. Korner

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:2bece925-76d7-4ae0-87a4-d09ef4971354
uuid:2bece925-76d7-4ae0-87a4-d09ef4971354
issn:0862-8408

Subject:

Fyziologie člověka a srovnávací fyziologie, stres (fyziologie), obezita, stress (physiology), obesity, genotype-phenotype relationship, integrative biology, Neural and non-neural mechanisms, high salt, systems analysis and phenotype, 14, and 612

Type:

article, články, model:article, and TEXT

Format:

print, bez média, and svazek

Description:

a1_The genes that cause or increase susceptibility to essential hypertension (EH) and related an imal models remain unknown. Their identification is unlikely to be realized with current genetic approaches, because of ambiguities in the genotype-phenotype relationships in these polygenic disorders. In turn, the phenotype is not just an aggregate of traits, but needs to be related to specific components of the circulatory control system at different stages of EH. Hence, clues about important genes must come through the phenotype, reversing the order of current approaches. A recent systems analysis has highlighted major differences in circulatory control in the two main syndromes of EH: 1) stress-and-salt-related EH (SSR-EH) - a constrictor hypertension with low blood volume; 2) hypertensive obesity - SSR-EH plus obesity. Each is initiated through sensitization of central synapses linking the cerebral cortex to the hypothalamic defense area. Several mechanis ms are probably involved, including cerebellar effects on baroreflexes. The result is a sustained increase in sympathetic neural activity at stimulus levels that have no effect in normal subjects. Subsequent progression of EH is largely thro ugh interactions with non-neural mechanisms, including changes in concentration of vascular autacoids (e.g. nitric oxide) and the amplifying effect of structural changes in large resistance vessels. The rising vasoconstriction increases heterogeneity of blood flow, causing rarefaction (decreased microvascular densit y) and deterioration of vital organs. SSR-EH also increases food intake in response to stress, but only 40% of these individual s develop hypertensive obesity. Their brain ignores the adiposity signals that normally reduce eating., a2_Hyperinsulinemia masks the sympathetic vasoconstriction through its dilator action, rais es blood volume, whilst renal nephropathy and other diabetic complications are common. In each syndrome the neural and non-neural determinants of hypertension provide targets fo r identifying high BP genes. Reading the genome from the phenotype will require new approaches, such as those used in developmental genetics. In addition, transgenic technology may help verify hypotheses and examine whether an observed effect is through single or multiple mechanisms. To obtain answers will require substantial collaborative efforts between physiologists and geneticists., P. I. Korner., and Obsahuje bibliografii

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Physiological research | 2010 Volume:59 | Number:6

Harvested from:

CDK

Metadata only:

false