12 Difference Between Exons and Introns

DefinitionNon-coding DNA sequences inside a gene are eliminated during the maturation of the RNA product by RNA splicing.Exons are DNA sequences that code for proteins and require the required codons or information for protein synthesis.
Type of sequenceNon-coding sequences that do not code for any protein are known as introns.Exons are protein-coding sequences that are responsible for the production of certain proteins.
Location in the DNAIn a DNA sequence, introns are found between two exons.Exons are protein-coding sequences that are found between two introns or between untranslated regions.
DistributionOnly present in eukaryotic genomes.Present in both eukaryotic and prokaryotic genomes.
Location in the cellAfter being spliced out of the mRNA transcript during RNA processing, introns remain in the nucleus.After the mature mRNAs are generated, exons exit the nucleus and travel to the cytoplasm.
Present inIntrons can be found in DNA and mRNA transcripts, although they are not seen in mature mRNAs.DNA, mRNA transcripts, and mature RNAs all contain exons.
ConservedIntron sequences are nearly identical to exon sequences in terms of conservation. The process of exonization may turn some introns into exons.Exon sequences are well conserved.
InvolvedIntrons are not involved in protein synthesis.Exons are involved in protein synthesis.
QuantityThe nuclear genome has more introns than exons.Exons make up a smaller proportion of the nuclear genome than introns.
Human genomeIntrons make up 24% of the human genome.Exons account for 1% of the human genome.
Alternative splicingAlternative splicing is used to eliminate introns.After alternative splicing, two or more exons are linked.
Novel genes formationShort non-coding sections of introns may grow into real functioning genes through a continual evolutionary process, resulting in novel genes.Exons can be arranged in a variety of ways, resulting in distinct sequences that code for different proteins.