title: Fibrinogen and CRP in Israeli families: genetic and environmental sources of concentrations and longitudinal changes.
abstract: OBJECTIVE
  To estimate the genetic and environmental determinants of plasma fibrinogen and C-reactive protein (CRP).
  
  
  RESULTS
  A complex segregation analysis was undertaken in a sample of 142 kindreds residing in Kibbutz settlements in Israel. In addition, included in this analysis were family members who were examined 10 years earlier in the framework of this study. Analysis indicated a major locus in addition to polygenic effect that explained the sex- and age-adjusted levels and longitudinal changes in plasma fibrinogen. A non-transmitted environmental major factor with no polygenic effect explained the adjusted variation in levels and change of CRP. Both the particular genotypes determined by the major genetic factor associated with fibrinogen levels and the particular ousiotypes determined by the major environmental factor associated with CRP levels were sex- and age-dependent. In addition, our results demonstrated significant interactions between polygenotype and gender, age and environmental factors such as smoking and BMI on fibrinogen and CRP levels.
  
  
  CONCLUSIONS
  Our models that consider interactions between genotypes and gender, age and environmental exposures have the potential to improve our understanding of the genetics of fibrinogen and CRP levels.
authors.affiliation: Unit of Epidemiology, Hebrew University-Hadassah School of Public Health, Jerusalem, Israel. ufried@vms.huji.ac.il
authors.forename: Yechiel
authors.initials: Y
authors.lastname: Friedlander
authors.forename: Jeremy D
authors.initials: JD
authors.lastname: Kark
authors.forename: Ronit
authors.initials: R
authors.lastname: Sinnreich
authors.forename: Russell P
authors.initials: RP
authors.lastname: Tracy
authors.forename: David S
authors.initials: DS
authors.lastname: Siscovick
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000097:blood; D002097:C-Reactive Protein / Q000378:metabolism*; D004781:Environmental Exposure / Q000009:adverse effects*; D018876:Environmental Illness / Q000097:blood / Q000453:epidemiology / Q000235:genetics; D005260:Female; D005340:Fibrinogen / Q000378:metabolism*; D005500:Follow-Up Studies; D020022:Genetic Predisposition to Disease; D006801:Humans; D015994:Incidence; D007557:Israel / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D010641:Phenotype; D012189:Retrospective Studies; D012307:Risk Factors
chemical_list: D015415:Biomarkers; D005340:Fibrinogen; D002097:C-Reactive Protein