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Significance of detection of extra metacentric microchromosome in amniotic cell culture
Abstract:
A metacentric bisatellited microchromosome was detected in all metaphases from an amniotic culture performed because of maternal age. A wide-ranging survey of the literature failed to disclose any consistent anomaly associated with such a marker, but did reveal that the clinical picture of patients manifesting it could range from complete normality through mental retardation to a variety of deformities. The parents elected for termination, and the only deformity detected in the abortus was fixed talipes equinovarus. The implications of the finding of this marker chromosome on amniocentesis, believed to be reported for the first time here, are discussed particularly in the context of genetic counselling.
Insights
A rare marker chromosome, a metacentric bisatellited microchromosome, was identified during prenatal diagnosis. Its association with diverse clinical outcomes highlights the complexities of genetic counseling for such findings.
Area of Science:
- Genetics
- Prenatal Diagnosis
- Cytogenetics
Background:
- Amniotic culture is a key prenatal diagnostic tool.
- Maternal age is a significant factor prompting genetic testing.
- Marker chromosomes can be challenging to interpret due to variable clinical presentations.
Observation:
- A metacentric bisatellited microchromosome was identified in all cells during amniocentesis for advanced maternal age.
- Literature review revealed no consistent anomaly linked to this specific marker.
- The spectrum of associated clinical outcomes ranged from normal development to significant abnormalities.
Findings:
- The abortus, resulting from termination, exhibited fixed talipes equinovarus as the sole detected anomaly.
- This specific marker chromosome finding during amniocentesis appears to be a novel report.
- The clinical significance of this marker chromosome remains uncertain due to its variable presentation.
Implications:
- The identification of this marker chromosome necessitates careful genetic counseling.
- Prenatal diagnosis of marker chromosomes requires thorough evaluation of potential risks.
- Understanding the variable expressivity of marker chromosomes is crucial for informed reproductive decisions.