No event after I was born caused me to become transgender.
I was born transgender (i.e. with Gender Dysphoria), and knew it from a very early age. I am TS.
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A lot can be learned about Transgender people from Intersex people.
For more on this, see Lynn Conway's page entitled
"Basic TG/TS/IS Information" at
http://ai.eecs.umich.edu/people/conway/TS/TS.html .
Lynn Conway's home page is at www.LynnConway.com .
She is transsexual, and is a very successful Computer Scientist and Engineer.
Her site is one of the largest TG sites on the web.