Constitutional Chromothripsis on Chromosome 2: A Rare Case with Severe Presentation

Area of Science:

• Genetics
• Developmental Biology
• Genomic Instability

Background:

• Chromothripsis involves chromosome shattering and reassembly, linked to congenital abnormalities and cancer.
• Constitutional chromothripsis is rare, manifesting as diverse birth defects in children.

Observation:

• A female infant presented with severe microcephaly, ocular dysgenesis, heart defect, and imperforate anus.
• Genetic analysis revealed complex chromosomal rearrangements on chromosome 2, including duplications, deletions, and inverted segments.

Findings:

• Mate pair sequencing and chromosomal microarray identified two duplications and two deletions on chromosome 2.
• Breakpoint analysis did not identify specific candidate genes, suggesting a broader genomic effect.

Implications:

• The severe phenotype and early death were likely due to the complex genomic rearrangement and combined copy number variations.
• This case underscores the significant impact of complex chromosomal rearrangements on developmental outcomes.