Familial pericentric inversion (10) and its effect on two offspring

Area of Science:

• Human Genetics
• Cytogenetics
• Reproductive Biology

Background:

• Pericentric inversions are structural chromosomal rearrangements involving the centromere.
• These rearrangements can lead to unbalanced gametes during meiosis.
• Understanding the inheritance patterns of inversions is crucial for genetic counseling.

Observation:

• A family spanning three generations exhibited a pericentric inversion on chromosome 10, specifically inv(10)(p15q24).
• One daughter of an inversion carrier presented with both the inv(10) and trisomy 18.
• Other offspring of the carrier inherited a recombinant chromosome 10.

Findings:

• The study identified a familial pericentric inversion of chromosome 10 (inv(10)(p15q24)).
• The inversion segregated, resulting in a daughter with trisomy 18, a known condition associated with chromosomal abnormalities.
• Recombinant chromosome 10 formation was observed in other offspring, indicating potential meiotic instability.

Implications:

• This case highlights the potential for pericentric inversions to lead to unbalanced chromosomal segregations, such as trisomy 18.
• It underscores the importance of cytogenetic analysis in families with recurrent miscarriages or offspring with congenital anomalies.
• Prenatal diagnosis and genetic counseling are essential for carriers of such inversions to assess reproductive risks.