Draw a typical eukaryotic gene and the pre-mRNA and mRNA...

Draw a typical eukaryotic gene and the pre-mRNA and mRNA derived from it. Assume that the gene contains three exons. Identify the following items and, for each item, give a brief description of its function: a. $5^{\prime}$ unt ranslated region b. Promoter c. A AUAAA consensus sequence d. Transcription start site e. $3^{\prime}$ unt ranslated region f. Introns g. Exons h. Poly(A) tail i. $5^{\prime}$ cap

Draw a typical eukaryotic gene and the pre-mRNA and mRNA derived from it. Assume that the gene contains three exons. Identify the following items and, for each item, give a brief description of its function:
a. $5^{\prime}$ unt ranslated region
b. Promoter
c. A AUAAA consensus sequence
d. Transcription start site
e. $3^{\prime}$ unt ranslated region
f. Introns
g. Exons
h. Poly(A) tail
i. $5^{\prime}$ cap

Key Concepts

5' Cap

A modified guanine nucleotide added to the 5' end of the mRNA that protects it from degradation and is essential for efficient translation initiation.

Poly(A) Tail

A chain of adenine nucleotides added to the 3' end of the mRNA that enhances mRNA stability, aids in nuclear export, and facilitates translation.

Exons

Coding regions within a gene that are retained in the mature mRNA after splicing and typically encode the amino acid sequence of the protein.

Introns

Non-coding sequences interspersed among coding regions in the pre-mRNA that are removed during RNA splicing to generate the mature mRNA.

AUAAA Consensus Sequence

A conserved sequence in the pre-mRNA that acts as a signal for cleavage and polyadenylation, critical for proper mRNA 3' end formation.

Transcription Start Site

The specific location on the DNA where RNA polymerase begins synthesizing the RNA transcript.

Promoter

A region of DNA located upstream of the coding sequence that binds transcription factors and RNA polymerase to initiate transcription of the gene.

5' Untranslated Region

This is a non-coding sequence at the beginning of the mRNA that, while not translated into protein, contains regulatory elements important for the control of translation and mRNA stability.

3' Untranslated Region

A section at the end of the mRNA that does not code for protein but contains elements involved in regulating mRNA stability, localization, and translation efficiency.

Transcript

00:01 What i'm going to do for this one, because i'm not the best artist, is just talk through each one of the terms.

00:08 You can easily google an image.

00:11 So the five prime untranslated region lies upstream of the translation start site.

00:18 So five prime upstream of translation start site.

00:33 In bacteria, there are ribome binding sites of the shine delgorodrome sequence is found within the 5 -prime untranslate trigon region.

00:52 However, eukaryotic mrna does not have this equivalence.

00:57 The ucariotic ribosome binds to the 5 -prime cap of an mrna molecule.

01:04 K, for b, the promoter is the dna sequence.

01:25 And it lies downstream of the coding region of the gene.

01:34 Downstream of coding region.

01:43 It determines the location of the three prime cleavage slide in the pre -mrna molecule.

01:54 The aaua consensus sequence lies downstream of the coding region of the gene.

02:06 It determines the location of the three prime cleavage site in the mrna molecule.

02:11 The transcription start site begins in the coding region and is generated is located 25 to 30 nucleotides downstream of tata box.

02:27 So 25 to 30 nukes down from the tata molecule.

02:47 So e, the 3 prime untranslated region is the sequence of nucleotides at the end of the 3 prime end of the mrna...

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