Mitochondrial DNA A1555G mutation of seven families with nonsyndromic hearing loss / 中华医学遗传学杂志
Chinese Journal of Medical Genetics
;
(6): 550-554, 2009.
Article
in Chinese
| WPRIM
| ID: wpr-287376
ABSTRACT
<p><b>OBJECTIVE</b>To study mitochondrial DNA (mtDNA) A1555G mutation in seven families with nonsyndromic hearing loss (NSHL).</p><p><b>METHODS</b>Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and real time-amplification refractory mutation system-quantitative PCR (ARMS-qPCR) were applied to detect mtDNA A1555G mutation in seven NSHL families. Related clinical data were also collected and analyzed.</p><p><b>RESULTS</b>The mtDNA A1555G mutation was detected in members from the maternal side, including heteroplasmy and homozygosis, others were negative for this mutation. The copy number of homoplasmic or heteroplasmic mutations of mtDNA A1555G correlated well with the degree of deafness (R = 0.341, P = 0.022 and R = 0.85, P = 0.015, respectively).</p><p><b>CONCLUSION</b>The mutation rate of the mtDNA A1555G is high in the NSHL patients, the mutation type include heteroplasmy and homozygosis. There is significant correlation between the mtDNA A1555G copy number and the severity of hearing loss.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Pathology
/
Pedigree
/
DNA, Mitochondrial
/
Point Mutation
/
Gene Dosage
/
Genetics
/
Hearing Loss
Limits:
Adolescent
/
Adult
/
Aged
/
Aged80
/
Child, preschool
/
Female
/
Humans
/
Infant
/
Male
Language:
Chinese
Journal:
Chinese Journal of Medical Genetics
Year:
2009
Type:
Article
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