Anyone else have a pathogenic whole gene TBX1 deletion /atypical 22q11.2 finding?
Hi everyone. I have DiGeorge syndrome, and I’ve recently been digging more deeply into the exact genetic finding behind my diagnosis.
My Invitae genetic testing came back positive for TBX1 Deletion (Entire coding sequence) heterozygous Pathogenic. The report says that a gross deletion encompassing the entire coding sequence of one copy of TBX1 was detected. However, it also says the boundaries of the deletion are unknown because they extend beyond the region that was tested, meaning other neighbouring genes could potentially be deleted as well.
So I know that one complete coding copy of TBX1 is deleted, but I don’t yet know whether this is
an isolated whole gene TBX1 deletion or a very small/atypical 22q11.2 deletion involving TBX1 and a few neighbouring genes, or part of a larger 22q11.2 deletion.
Clinically, I’ve been diagnosed with DiGeorge syndrome and have features like a right sided aortic arch and mild/incompletely expressed hypoparathyroidism with intermittent low calcium. I also have significant immune system problems. I’m especially curious whether anyone else has received genetic results specifically worded as “TBX1 deletion (entire coding sequence)” or had an initially undefined TBX1 deletion.
If so, did you later have a chromosomal microarray or another test that mapped the deletion? Did it turn out to involve only TBX1, a small atypical 22q11.2 region, or the more typical larger deletion?