I thought you said they thought Josh has EHK. TGM-1 is what they test for LI. KRT1 and KRT10 are the genes most commonly found for EHK when the hands and feet are the most affected.
Ichthyosis-en-Confetti Type 2
Husband, Nathan - 10, Elliot - 7, Oliver - 4, all affected.
I also have an unaffected daughter, age 8.
email: jennifer at confettiskin dot com
facebook - find me on "ichthyosis mommy spot" or "friends of ichthyosis"