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[Molecular cytogenetics study in a case with unbalanced chromosome translocation]
1National Laboratory of Medial Genetics, Hunan Medical University, Changsha, Hunan, 410078 P.R. China. nlmglcy@public.cs.hn.cn
Summary
This study identified an unbalanced translocation t(1;18)(q42;q22) in a patient using fluorescence in situ hybridization. This chromosomal abnormality results in partial trisomy 1q and partial monosomy 18q, potentially linked to congenital heart disease.
Area of Science:
- Cytogenetics
- Molecular Biology
- Human Genetics
Background:
- Chromosome structural aberrations can lead to genetic disorders.
- Unbalanced translocations involve the gain or loss of genetic material.
- Accurate diagnosis is crucial for understanding genetic conditions.
Observation:
- High-resolution G-banding suggested a chromosomal abnormality.
- Fluorescence in situ hybridization (FISH) was employed for detailed analysis.
- Whole chromosome specific painting probes for chromosomes 1 and 18 were utilized.
Findings:
- An unbalanced translocation, denoted as t(1;18)(q42;q22), was confirmed.
- The translocation resulted in partial trisomy for the long arm of chromosome 1 (1q42-qter).
- The translocation also caused partial monosomy for the long arm of chromosome 18 (18q22-qter).
Implications:
- The identified translocation t(1;18)(q42;q22) may be associated with congenital heart disease.
- This finding highlights the importance of cytogenetic analysis in diagnosing genetic disorders.
- Understanding the specific chromosomal imbalance provides insights into potential developmental abnormalities.