Summary
The consanguinity of parents (born in France) of individuals who have a recessive disease has been studied. The frequency of first cousin marriages is less than 0.2% in the general French population. Among the parents of affected individuals the following frequencies of first cousin matings were observed:
cystic fibrosis: 1.4%
cystinosis: 7.1%
nephronophtisis: 5.6%
spinal muscular atrophy: 4.5%
albinsism: 5.0%
achromatopsia: 12.5%
(Albinism and spinal muscular atrophy are heterogeneous conditions). The increase in the frequency of first cousin marriages relative to that of the general population is much greater, as expected, in cystinosis, which is a rare disease, than in cystic fibrosis, which is the most frequent recessive disorder in France.
Inbreeding in cystinosis and cystic fibrosis was also studied by computing the distance between parental birth places. This distance is smaller in cystinosis than in cystic fibrosis.
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Tchen, P., Bois, E., Feingold, J. et al. Inbreeding in recessive diseases. Hum Genet 38, 163–167 (1977). https://doi.org/10.1007/BF00527398
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DOI: https://doi.org/10.1007/BF00527398