mRNA is made from DNA template strand during transcription. First the two DNA strands are separated and the tepmplate strand which runs from 3'-5' produces mRNA according to base pair rules as follows.
RNA polymerase is the enzyme that catalyzes the synthesis of mRNA from DNA.
RNA polymerase enzyme recognizes an initiation site (TAC codon in DNA), a promoter sequence (usually containing a "TATA" box) in the DNA. Elongation of the RNA continues until a termination sequence( UAG or UGA or UAA codons) has been transcribed. Then transcription is teminated and the entire RNA polymer is freed from the DNA.
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