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[Screening for the 1555G mutation in mitochondrial DNA in pedigrees with aminoglycoside antibiotic induced deafness]
Objective:
To identify the relationship between the 1555G mutation in mitochondrial DNA and aminoglycoside antibiotic induced deafness and provide theoretical evidence for establishing diagnostic method.
Methods:
Blood samples were obtained from three pedigrees with aminoglycoside antibiotic induced deafness. DNA was extracted from the isolated leukocytes. The mitochondrial DNA fragments were amplified by PCR, 1555G mutation was detected by Alw26 I restriction endonuclease digestion, allele-specific oligonucleotide hybridization and DNA sequencing.
Results:
Seven individuals from pedigrees A and C carried homoplasmic 1555G mutation, six individuals from pedigree B did not have 1555G mutation.
Conclusion:
1555G mutation is not the only pathologic mitochondrial DNA mutation associated with aminoglycoside antibiotic induced deafness. This is the first finding of aminoglycoside antibiotic induced deafness pedigree without 1555G mutation.
Insights
The 1555G mutation in mitochondrial DNA is linked to aminoglycoside-induced deafness. However, this study identified a pedigree with this type of deafness but lacking the 1555G mutation, suggesting other genetic factors.
Area of Science:
- Genetics
- Pharmacology
- Otolaryngology
Context:
- Aminoglycoside antibiotics are a common cause of sensorineural hearing loss.
- The 1555G mutation in mitochondrial DNA (mtDNA) has been associated with increased susceptibility to aminoglycoside-induced deafness.
- Genetic factors influencing drug-induced ototoxicity are not fully understood.
Purpose:
- To investigate the role of the 1555G mtDNA mutation in aminoglycoside-induced deafness.
- To identify potential genetic markers for predicting susceptibility to aminoglycoside ototoxicity.
- To provide theoretical evidence for developing diagnostic methods for this condition.
Summary:
- Three pedigrees with aminoglycoside-induced deafness were studied.
- DNA analysis, including PCR, restriction digestion, hybridization, and sequencing, was used to detect the 1555G mutation.
- Seven individuals in pedigrees A and C had the homoplasmic 1555G mutation, while six individuals in pedigree B did not.
Impact:
- The 1555G mutation is not the sole cause of aminoglycoside-induced deafness.
- This study reports the first identified pedigree with aminoglycoside-induced deafness that lacks the 1555G mutation.
- Findings suggest the involvement of other genetic factors in aminoglycoside ototoxicity, necessitating further research into diagnostic and preventative strategies.