Idea of the film: If you are naturally conceived then you are an invalid and disadvantaged. 

Gattaca is composed entirely of the letters used to label the nucleotide bases of DNA. The four nitrogen bases of DNA are adenine, thymine, cytosine, and guanine. These are known as “GATA or CA” – hence GATTACA.

Gattaca is a futuristic dystopia that issues a warning about the dangers of genetic selection.