Review outlines two decades of cytogenetic progress across millions of karyotypes, highlighting the prevalence and mechanisms of chromosomal abnormalities.
Key Points
To review the major discoveries, technological innovations, and clinical advancements in human cytogenetics over a twenty-year period.
Synthesized historical and clinical findings encompassing approximately 2,000,000 karyotyped individuals.
Evaluated advancements in chromosome banding techniques, sex determination mechanisms, neoplasm cytogenetics, and meiotic aberrations.
Abnormal karyotypes are estimated to occur in 15% of all human zygotes, 50% of spontaneous abortuses, and 0.5% of unselected newborns.
Key discoveries include the role of the Y chromosome in sex determination, X-chromosome inactivation in females, centromeric inactivation, and fragile chromosome sites.
Unlike mice, where unbalanced translocation fetuses almost always die, many human fetuses with unbalanced translocations survive to live birth.