Intergenic sequnces contributes to the non-coding DNA. It is usually found in the location between the genes which is different from the intragenic sequences in the sense that they are found within the genes,. Thus intergenic sequence includes any of the region in between gene-coding DNA including untranslated regions, 5' and 3' regions(the region which houses 3' and 5' end of the transcription unit), introns, non-functional pseudogenes , non-functional repetitive sequences.
This DNA may or may not encode regulatory functions but the other functions are still unknown. This is also known as the 'dark region' of the DNA.
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