A female with IP may have inherited the IKBKG mutation from either parent or have a new gene mutation.
[en.wikipedia.org]
IP is caused by mutation of the IKBKG/NEMO gene on Xq28. Deletion of exons 4 to 10 (NEMOΔ4-10) accounts for about 80% of cases (familial and sporadic).
[pubfacts.com]
A novel nonsense mutation of the IKBKG gene Helen Fryssira, Talia Kakourou, Manthoula Valari, Kaliopi Stefanaki, Stella Amenta & Emmanuel Kanavakis Acta Paediatrica (2011)
[nature.com]