title: Evidence for genetic anticipation in nodal osteoarthritis.
abstract: OBJECTIVE
  Evidence was sought for genetic anticipation (disease occurring at an earlier age in subsequent generations, with increasing severity) in nodal osteoarthritis (NOA).
  
  
  METHODS
  Age at symptom onset and disease severity was compared within 30 parent/offspring pairs with NOA. Correlation between the offspring age of disease onset and the parental age at conception was also assessed.
  
  
  RESULTS
  The age at onset of nodal symptoms was earlier in the offspring (43 years (95% confidence intervals (CI) 38 to 47) v 61 (CI 58 to 65); mean difference 18 years (CI 13 to 22): p < 0.001) as was larger joint symptom onset (48 years (CI 41 to 55) v 67 (CI 61 to 73); mean difference 20 years (CI 13 to 27): p < 0.01). A negative correlation existed between age of offspring symptom onset and parental age at conception. Fifteen (50%) offspring had similar or more extensive disease than their parents.
  
  
  CONCLUSIONS
  These results suggest genetic anticipation occurs in NOA and if confirmed a search for trinucleotide repeats is warranted.
authors.affiliation: Department of Rheumatology, City Hospital, Nottingham.
authors.forename: G D
authors.initials: GD
authors.lastname: Wright
authors.forename: M
authors.initials: M
authors.lastname: Regan
authors.forename: C M
authors.initials: CM
authors.lastname: Deighton
authors.forename: G
authors.initials: G
authors.lastname: Wallis
authors.forename: M
authors.initials: M
authors.lastname: Doherty
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D020132:Anticipation, Genetic; D005260:Female; D005306:Fertilization; D006801:Humans; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000235:genetics* / Q000473:pathology; D010290:Parents; D012720:Severity of Illness Index; D013997:Time Factors