My four-year-old son has NDI. * How can NDI be inherited when his parents dont have any of the symptoms?
One form of familial NDI is due to a recessive mutation that is carried by females but causes DI only in males. Therefore, it is possible, if not likely, that your son inherited the disease from his mother, even though she is not affected. It is also possible that he has a de novo mutation (which means that it occurred in the fertilized egg from which he developed) or that he has another type of recessive mutation that does not affect either male or female carriers and causes the disease only when an offspring inherits a gad gene from each parent (neither of whom is affected themselves). If you have not already had a genetic analysis performed, you should consider having this done.
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