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A rare inherited euchromatic heteromorphism on chromosome 1
A L Zaslav1, D Blumenthal, J E Fox
1Division of Human Genetics, Schneider Children's Hospital, Long Island Jewish Medical Center, Albert Einstein College of Medicine, New Hyde Park, NY 11042.
Prenatal Diagnosis
|July 1, 1993
Summary
Extra euchromatic genetic material on chromosome 1 (1p+) is typically linked to abnormalities. However, this study found a phenotypically normal mother and infant with this euchromatic heteromorphism, suggesting it can occur without adverse effects.
Area of Science:
- Cytogenetics
- Human Genetics
- Prenatal Diagnosis
Background:
- Extra euchromatic genetic material is often associated with phenotypic abnormalities.
- Recent research indicates exceptions to this general rule.
- Prenatal diagnosis is crucial for identifying chromosomal anomalies.
Observation:
- Chromosome analysis of amniotic fluid cells from a 37-year-old woman revealed a 46,XY,1p+ karyotype in all cells.
- The extra genetic material was located in chromosome band region 1p21-->31.
- Both the mother and the fetus shared the same 1p+ chromosome, while the father had a normal karyotype.
Findings:
- Detailed cytogenetic studies (C and Q banding, silver staining) confirmed the extra material on the 1p+ chromosome was euchromatic.
- This anomaly was characterized as a euchromatic heteromorphism.
- This represents the first reported case of a euchromatic heteromorphism on chromosome 1 in a phenotypically normal mother and infant.
Implications:
- Euchromatic heteromorphisms, particularly on chromosome 1, may not always lead to adverse phenotypic outcomes.
- This finding expands the understanding of chromosomal variations and their clinical significance.
- Further research is needed to fully elucidate the implications of such variations in prenatal and postnatal settings.