Polar Body Biopsy
A genetic testing procedure that analyzes polar bodies extruded from eggs to assess maternal chromosomal contributions.
Full Definition
Polar body biopsy is a form of preimplantation genetic testing that involves removing and analyzing the first and second polar bodies expelled from mature oocytes during meiosis. Since polar bodies contain chromosomes that are discarded during egg maturation, their analysis can provide information about the maternal genetic contribution to the embryo without directly manipulating the embryo itself. This technique is primarily used to detect maternal age-related chromosomal abnormalities and specific genetic disorders. However, it only provides information about maternal chromosomes and cannot detect paternal genetic contributions or post-fertilization chromosomal errors.
Usage
Usage note: Less commonly used than embryo biopsy due to limitations in genetic information obtained.
In Context
- "Polar body biopsy was performed to screen for maternal chromosomal abnormalities in advanced maternal age." — Laboratory procedure note
- "The limitations of polar body biopsy include inability to detect paternal genetic contributions." — Genetic counseling session