{{Rsnum
|rsid=12587781
|Gene=TRA@
|Chromosome=14
|position=22530666
|Orientation=plus
|GMAF=0.292
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|geno1=(G;G)
|geno2=(G;T)
|geno3=(T;T)
}}{{ population diversity
| geno1=(G;G)
| geno2=(G;T)
| geno3=(T;T)
| CEU | 2.7 | 25.7 | 71.7
| HCB | 38.7 | 49.6 | 11.7
| JPT | 44.2 | 43.4 | 12.4
| YRI | 1.4 | 15.6 | 83.0
| ASW | 0.0 | 21.1 | 78.9
| CHB | 38.7 | 49.6 | 11.7
| CHD | 44.0 | 43.1 | 12.8
| GIH | 6.9 | 31.7 | 61.4
| LWK | 0.0 | 15.5 | 84.5
| MEX | 3.4 | 41.4 | 55.2
| MKK | 2.6 | 25.6 | 71.8
| TSI | 3.9 | 32.4 | 63.7
| HapMapRevision=28
}}[http://blog.23andme.com/2009/05/04/snpwatch-genetic-study-strengthens-case-for-autoimmune-cause-of-narcolepsy/ 23andMe blog] Each copy of the G version of [[rs12587781]] increased the odds of [[narcolepsy]] by 1.79 times in Europeans and 1.34 times in Asians.  The G version of rs12587781 showed a trend towards increased odds of narcolepsy for African Americans, but the results were not statistically significant.

{{omim
|id=612851
|rsnum=12587781
}}

{{PMID Auto
|PMID=19412176
|Title=Narcolepsy is strongly associated with the T-cell receptor alpha locus.
|OA=1
}}

{{on chip | 23andMe v1}}
{{on chip | 23andMe v2}}
{{on chip | 23andMe v3}}
{{on chip | 23andMe v4}}
{{on chip | Affy GenomeWide 6}}
{{on chip | FTDNA2}}
{{on chip | HumanOmni1Quad}}
{{on chip | Illumina Human 1M}}