How can a eukaryote get more than one protein product from a single gene?
However, splicing does allow for a process called alternative splicing, in which more than one mRNA can be made from the same gene. Through alternative splicing, we (and other eukaryotes) can sneakily encode more different proteins than we have genes in our DNA.
How are multiple transcripts derived from the same gene?
As for finding multiple transcripts for a given gene, this is the result of alternative splicing, which is part of what contributes to making an organism (such as ourselves) so complex with a relatively small number of genes. And Daniel is right – every alternative transcript has a biological function.
How can a single gene encode multiple versions of a protein?
Gene splicing is a post-transcriptional modification in which a single gene can code for multiple proteins. Gene Splicing is done in eukaryotes, prior to mRNA translation, by the differential inclusion or exclusion of regions of pre-mRNA. Gene splicing is an important source of protein diversity.
Can a single gene be transcribed multiple times?
A single gene can be transcribed multiple times. The mRNA molecule is divided up into codons. A codon is a series of three consecutive mRNA bases coding for one specific amino acid.
How can the expression of a single gene lead to the production of different proteins?
This process is known as splicing. RNA splicing involves the removal or “splicing out” of certain sequences in the mRNA, referred to as intervening sequences, or introns. Splicing different combinations of exon together can lead to the production of a variety of different proteins being produced from a single gene.
Does each gene make one protein?
A single gene can produce multiple protein sequences, depending on which exons are included in the mRNA transcript, which carries instructions to the cell’s protein-building machinery. Two different forms of the same protein, known as isoforms, can have different, even completely opposite functions.
Which processes produce different proteins in different cells from the same primary transcript?
The process by which a single primary RNA transcript is used to make multiple proteins is called: alternative splicing. The first level of gene regulation occurs along the chromosome, through chemical modifications of the DNA or histones.
How does a single gene produce mRNA that codes for several different proteins?
Splicing is the process by which introns are removed (Figure below). Sometimes a process called alternative splicing allows pre-mRNA messages to be spliced in several different configurations, allowing a single gene to encode multiple proteins.
How many Rnas can be transcribed from a single DNA template?
Since DNA is double-stranded, two different RNA molecules could in principle be transcribed from any gene, using each of the two DNA strands as a template.
Where does transcription in eukaryotes occur?
the nucleus
Thus, in eukaryotes, while transcription occurs in the nucleus, translation occurs in the cytoplasm.