lituranga

lituranga t1_ja9kmon wrote

That’s not true, there are many AR conditions with common pathogenic carrier mutations which mean that many affected individuals are absolutely homozygous without any consanguinity.

It’s not exceedingly improbable at all. Examples off top of my head are delta f 508 for Cystic fibrosis, all the ashkenazi Jewish common AR conditions, SMA, sickle cell disease, alpha thal, beta thal, and I’ve personally seen many patients with other disorders who are affected and homozygous for same pathogenic variant.

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