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Related Concept Videos

Point and Frameshift Mutations01:30

Point and Frameshift Mutations

Point mutations are genetic alterations involving the change of a single nucleotide base pair in DNA. Depending on how the alteration affects protein synthesis, they can lead to various consequences.Point mutations fall into the following types:Silent mutations occur when a nucleotide change does not alter the amino acid sequence due to the redundancy of the genetic code. For instance, changing ACC to ACA still encodes threonine, leaving the protein function unaffected. This occurs because...
Mutations01:39

Mutations

Overview
Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Mutations01:39

Mutations

Overview
Alternative RNA Splicing02:18

Alternative RNA Splicing

Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
Translation01:31

Translation

Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life

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Two new alpha-thalassemia frameshift mutations.

Hong-Yuang Luo1, Adeboye H Adewoye, Monika Pilichowska

  • 1Hemoglobin Diagnostic Reference Laboratory, Boston Medical Center, Boston, Massachusetts 02118, USA.

Hemoglobin
|May 9, 2007
PubMed
Summary

Two novel frameshift alpha-thalassemia mutations were identified. These genetic variations, one in the alpha1-globin gene and another in the alpha2-globin gene, expand the known spectrum of alpha-thalassemia.

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Area of Science:

  • Hematology
  • Genetics
  • Molecular Biology

Background:

  • Alpha-thalassemia is a prevalent global blood disorder.
  • Deletional mutations are the most common cause of alpha-thalassemia worldwide.

Observation:

  • This study identified two distinct frameshift mutations in alpha-globin genes.
  • A novel deletion at codon 62 of the alpha1-globin gene was found in an African American individual.
  • A previously reported deletion at codon 22 of the alpha2-globin gene was observed in a Hispanic patient.

Findings:

  • Reported are two rare frameshift alpha-thalassemia mutations.
  • A novel alpha1-globin gene deletion (codon 62) and a second report of an alpha2-globin gene deletion (codon 22) were characterized.

Implications:

  • These findings contribute to understanding the genetic diversity of alpha-thalassemia.
  • Identification of novel mutations aids in genetic diagnosis and counseling for alpha-thalassemia.
  • Expanding the known mutation spectrum is crucial for comprehensive carrier screening and population studies.