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Small accessory chromosomes (SAC) and their genotype--phenotype correlation
Journal De Genetique Humaine
|October 1, 1982
Summary
Small accessory chromosomes (SAC) were identified in 39 patients. The origin of most extra chromosome material was unknown, but C-banded heterochromatin was a common feature in these SAC carriers.
Area of Science:
- Human Genetics
- Cytogenetics
- Medical Genetics
Background:
- Small accessory chromosomes (SAC) are rare genetic variations.
- Understanding the origin and implications of SAC is crucial in genetic diagnostics.
Purpose of the Study:
- To report the prevalence of SAC carriers in a patient cohort.
- To investigate common features and discuss genotype-phenotype correlations in SAC carriers.
Main Methods:
- Karyotyping of 32,930 patients from 1966-1981.
- Application of various chromosome banding techniques.
- Analysis of C-banded heterochromatin presence.
Main Results:
- 39 SAC carriers were identified among 32,930 patients.
- The origin of extra chromosome material remained unknown in most index patients (21/29).
- C-banded heterochromatin was a consistent feature in all described SAC.
Conclusions:
- SAC are rare findings in routine human genetic diagnostics.
- The presence of C-banded heterochromatin is a characteristic of SAC.
- Further research is needed to elucidate the origin and clinical significance of SAC.