Day 169 (Xp11.3-Xp11.22): a microsatellite with an effect on temperament


Day 169 has 104 protein-coding genes (browser view) including MAOA and MAOB (monamine oxidase A and B).

MAOA and MAOB are enzymes that break down neurotransmitters. The control region before the MAOA gene (the promoter) has a region with a variable number of short repeats in different people (a VNTR, a type of microsatellite). This leads to different levels of activity of MAOA, which has been associated with autism, antisocial behavior, and predisposition to violence, leading to media coverage of a so-called “warrior gene.”

Click here to see all 8668939 letters of Day 169 with the MAOA promoter VNTR underlined.

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