不安障害や感情障害に関連しないから恐らく違う
https://www.ncbi.nlm.nih.gov/pubmed/24842237
We were not able to find any associations between 5-HTTLPR and anxiety-related
phenotypes in both case-control and trio analyses.

http://www.nature.com/articles/4000936
5-HTTLPR allele frequencies were not significantly different between controls and
bipolars, major depressives, schizophrenics, delusionals and psychotic NOS; genotype
analysis also did not show any association. The analysis of symptomatology did not
show significant differences.

だから５HTTとMAOA短型をからめた研究もあるらしい
https://www.ncbi.nlm.nih.gov/pubmed/21610556
こっちのほうは思春期児童のADHD症状にきっちり関係している