Identifying the disease gene in human monogenic disorders

4 important questions on Identifying the disease gene in human monogenic disorders

What are multifactorial diseases?

  • Each mutation has small effect on disease risk
  • every person has different combination of sussceptibillity.
  • selection against variants is weak
  • variants can become common


  1. genes
  2. environment
  3. epi-genetic
example= diabetes

What are monogenic diseases?

  • Mutation have a strong effect om disease risk (high penetrance)
  • selction against mutations often strong
  • mutations therefore rare in population

Threshold model for multifactorial disorders, what does it say?

  • Gives you information on when you get the disease
  • you need a high number of risk factors to get the disease
  • gives the liability (betrouwbaarheid)
    • the threshold z is the biological limit past which disease develops
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What says the continuous risk model?

  • how more genetic risk variants there are the more the risk there is to get the disease

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