You are studying a grave human disease called β-thalassemia in which no β-globin protein is prod

step 1 In this question, we're being asked about sickle cell anemia, which is a tragic disease that aff

You are studying a grave human disease called β-thalassemia...

You are studying a grave human disease called $\beta$-thalassemia in which no $\beta$-globin protein is produced. You find that the $\beta$-globin gene's coding region in people with this disease is normal, but the mRNA is over a hundred nucleotides longer than normal. You sequence the $\beta$-globin gene in these people and find a single base change within the gene's first intron. Present a hypothesis to explain the absence of $\beta$-globin in these patients.

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Key Concepts

RNA Splicing

RNA splicing is the post-transcriptional process in which non-coding sequences (introns) are removed from the pre-mRNA transcript and the coding sequences (exons) are joined together to form a mature mRNA. This process is essential for producing a transcript that can be correctly translated into a functional protein.

Splice Site Recognition

Splice site recognition involves the identification of specific nucleotide sequences at the intron/exon boundaries by the spliceosome. Accurate recognition of these sites is crucial to ensure that the splicing machinery removes introns precisely and avoids including non-coding sequences in the mature mRNA.

Activation of Cryptic Splice Sites

Activation of cryptic splice sites occurs when a mutation creates or exposes a non-standard splice site within an intron, leading the splicing machinery to erroneously incorporate additional intronic sequences into the mRNA. This aberrant splicing can disrupt the normal reading frame, potentially resulting in a non-functional protein or triggering mRNA degradation mechanisms.

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