Function transcribe

Transcribes a gene into pre-mRNA by finding promoters and converting DNA to RNA.

This function models the biological process of transcription:

1. Searches for promoter elements upstream of the gene
2. Determines the transcription start site (TSS)
3. Transcribes the entire gene (exons + introns) into RNA
4. Looks for polyadenylation signals to determine transcript end
5. Returns PreMRNA with complete transcript and structural information

Example

const gene = new Gene(dnaSequence, exons);
const result = transcribe(gene);

if (isSuccess(result)) {
    const preMRNA = result.data;
    console.log(`Transcribed ${preMRNA.getSequence().length}nt pre-mRNA`);
    console.log(`Has ${preMRNA.getIntronRegions().length} introns to splice`);
} else {
    console.error('Transcription failed:', result.error);
}
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