title: A genealogical study of essential hypertension with and without obesity in French Canadians.
abstract: OBJECTIVE
  To investigate genetic homogeneity in a set of hypertensive families and in subsets chosen for high and low prevalence of obesity; and to compare fasting insulin and lipids, ion transport, and water homeostasis in the obese and lean families.
  
  
  METHODS
  The study was carried out in a relative population isolate of the Saguenay/Lac St. Jean region in Canada. Genetic homogeneity was evaluated with the mean coeffigcients of kinship (phi) and inbreeding (F) computed with ascending genealogies. Serum insulin and lipids were measured after overnight fasting. Total body water was estimated with bioelectrical impedance. Sodium-lithium countertransport and sodium-potassium co-transport were determined in freshly isolated erythrocytes.
  
  
  RESULTS
  F and phi were increased in hypertensive families compared with families selected at random. F and phi were further increased within the subsets of obese and lean families. In addition, fasting insulin, total body water, sodium-lithium countertransport, and sodium-potassium co-transport were higher in the obese than in the lean families. The two subsets of families did not differ by fasting lipids.
  
  
  CONCLUSIONS
  In the Saguenay/Lac St. Jean population, the degree of genetic homogeneity was increased in families selected for hypertension, and it was further increased in subsets of hypertensive families with high and low prevalence of obesity. This suggests that hypertension in lean and obese individuals may represent, at least in part, separate genetic entities. Some of the extra genes shared in common within the subsets may contribute to their differences in body weight, insulin sensitivity, ion transport, and water homeostasis.
authors.affiliation: University of Montreal Health Centre, Canada. zdenka.pausova@umontreal.ca
authors.forename: Zdenka
authors.initials: Z
authors.lastname: Pausova
authors.forename: Michele
authors.initials: M
authors.lastname: Jomphe
authors.forename: Louis
authors.initials: L
authors.lastname: Houde
authors.forename: Helene
authors.initials: H
authors.lastname: Vezina
authors.forename: Sergei N
authors.initials: SN
authors.lastname: Orlov
authors.forename: Francis
authors.initials: F
authors.lastname: Gossard
authors.forename: Daniel
authors.initials: D
authors.lastname: Gaudet
authors.forename: Johanne
authors.initials: J
authors.lastname: Tremblay
authors.forename: Theodore A
authors.initials: TA
authors.lastname: Kotchen
authors.forename: Allen W
authors.initials: AW
authors.lastname: Cowley
authors.forename: Gerard
authors.initials: G
authors.lastname: Bouchard
authors.forename: Pavel
authors.initials: P
authors.lastname: Hamet
mesh_terms: D017920:Antiporters / Q000097:blood; D001692:Biological Transport; D001834:Body Water; D003241:Consanguinity; D017097:Electric Impedance; D004912:Erythrocytes / Q000378:metabolism; D005260:Female; D006801:Humans; D006973:Hypertension / Q000150:complications / Q000453:epidemiology / Q000235:genetics*; D007328:Insulin / Q000097:blood; D008055:Lipids / Q000097:blood; D008094:Lithium / Q000097:blood; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000150:complications / Q000453:epidemiology / Q000235:genetics*; D011188:Potassium / Q000097:blood; D011792:Quebec / Q000453:epidemiology; D012307:Risk Factors; D012964:Sodium / Q000097:blood
chemical_list: D017920:Antiporters; D007328:Insulin; D008055:Lipids; C045885:sodium-lithium countertransporter; D008094:Lithium; D012964:Sodium; D011188:Potassium