I'm also not sure I've seen specific mention of anti-tTG6 in peripheral neuropathy, although I've seen other articles reference it more generally.
Gluten sensitivity:an emerging issue behind neurological impairment?
http://www.ncbi.nlm.nih.gov/pubmed/20170835
Quote:
"Additionally, antibodies to TG6 have have been found in the sera of patients with neurological disorders. Preliminary data suggest that antibodies to TG6 are markers for neurological gluten sensitivity, whereas antibodies to TG3 might be markers for dermatitis herpetiformis."
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Course, the reference points back to Hadjivasilliou 2008.
In Dr. H's paper, there are some generalized references of anti-tTG6 to neurological dysfunction or neurological manifestation but when I look for specific references I only see anti-tTG6 in reference to gluten ataxia.
I have seen (I'm sure you have, too) reference to anti-Purkinje cell in patients with cerebellar ataxia and anti-ganglioside antibodies in patients with peripheral neuropathy.