Related Experiment Videos
Turner syndrome: a cytogenetic and molecular study
1Wessex Regional Genetics Laboratory, Salisbury District Hospital, Wiltshire, UK.
Annals of Human Genetics
|April 17, 1998
Summary
This study investigated Turner syndrome (TS) chromosomal abnormalities in 211 patients. Findings reveal common 45,X karyotypes, mosaicism, and structural X or Y chromosome variations, with insights into parental origin.
Area of Science:
- Genetics
- Reproductive Biology
- Human Chromosome Abnormalities
Background:
- Turner syndrome (TS) affects females with chromosomal abnormalities.
- Understanding the cytogenetic basis and parental origin is crucial for genetic counseling.
Purpose of the Study:
- To analyze cytogenetic findings in 211 Turner syndrome patients.
- To determine the frequency of cryptic mosaicism.
- To investigate parental age and origin of chromosomal abnormalities.
Main Methods:
- Karyotyping of 100 cells from blood cultures.
- Molecular analysis for cryptic X and Y chromosome mosaicism.
- Parental origin determination using genetic markers.
Main Results:
- 97 patients had 45,X, 15 showed mosaicism (45,X/46,XX or 45,X/47,XXX).
- 86 had structurally abnormal X chromosomes, 13 had abnormal Y chromosomes.
- Two cryptic X mosaics detected; 74% of 45,X cases had maternal X origin.
Conclusions:
- Paternal origin predominates for deletions, rings, and abnormal Y chromosomes in TS.
- Male gametogenesis may predispose sex chromosomes to errors, contributing to TS.