[Double trisomy and transmitted pericentric inversion (48,XXY, +21,inv(22)). Interchromosomal effect]

Area of Science:

• Genetics
• Human Genetics
• Reproductive Genetics

Background:

• Aneuploidy, specifically trisomy 21 (Down syndrome) and XXY (Klinefelter syndrome), are common chromosomal abnormalities.
• Pericentric inversions are structural rearrangements of chromosomes that can impact meiotic recombination and segregation.
• Maternal inheritance of chromosomal abnormalities plays a significant role in offspring genetic conditions.

Observation:

• A patient presented with a rare double aneuploidy, exhibiting both trisomy 21 and XXY karyotypes.
• The patient inherited a pericentric inversion on chromosome 22 from their mother.
• This specific chromosomal configuration suggests a potential link between the maternal inversion and the observed aneuploidies.

Findings:

• The study investigates the potential role of the maternal pericentric inversion 22 in the etiology of the patient's double aneuploidy.
• Analysis focuses on how the structural rearrangement might have influenced chromosome segregation during meiosis.
• The findings aim to elucidate the mechanism by which a maternal inversion can contribute to multiple aneuploidies in offspring.

Implications:

• Understanding the role of parental chromosomal rearrangements in aneuploidy is crucial for genetic counseling.
• This case highlights the importance of investigating parental karyotypes in recurrent or complex aneuploidy cases.
• Further research into the meiotic behavior of inverted chromosomes can improve prediction of aneuploidy risks.