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Fusco, Francesca; Conte, Matilde Immacolata; Diociaiuti, Andrea; Bigoni, Stefania; Branda, Maria Francesca; Ferlini, Alessandra; El Hachem, Maya; Ursini, Matilde Valeria
Pediatrics (Evanston), 09/2017, Volume: 140, Issue: 3Journal Article
Incontinentia pigmenti (IP; Online Mendelian Inheritance in Man catalog #308300) is an X-linked dominant ectodermal disorder caused by mutations of the inhibitor of κ polypeptide gene enchancer in B cells, kinase γ ( )/ nuclear factor κB, essential modulator ( ) gene. Hemizygous loss-of-function (LoF) mutations are lethal in males, thus patients are female, and the disease is always transmitted from an IP-affected mother to her daughter. We present 2 families with father-to-daughter transmission of IP and provide for the first time molecular evidence that the combination of somatic and germ-line mosaicism for loss of function mutations in IP males resulted in the transmission of the disease to a female child. We searched for the mutant allele in blood, urine, skin, and sperm DNA and found that the 2 fathers were somatic and germ-line mosaics for the p.Gln132×mutation or the exon 4-10 deletion of , respectively. The highest level of mutant cells was detected in the sperm, which might explain the recurrence of the disease. We therefore recommend careful clinical evaluation in IP male cases and the genetic investigation in sperm DNA to ensure correct genetic counseling and prevent the risk of paternal transmission of IP.
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