Task: Answer Verification
Input (English): Question: Is thymidine phosphorylase gene mutation a primary cause of mitochondrial neurogastrointestinal encephalomyopathy ( MNGIE )?
Answer: TP gene mutation is not a primary cause of MNGIE, but with a mitochondrial deletion mutation, a single nucleotide polymorphism (SNP) of the TP gene may be crucial in the pathogenesis of MNGIE.
Output (English): no