Trisomy 3q : two clinically similar but cytogenetically different cases

Area of Science:

• Human Genetics
• Cytogenetics
• Clinical Medicine

Background:

• Trisomy 3q, duplication of the long arm of chromosome 3, is a rare chromosomal abnormality.
• Previous cases of trisomy 3q have been reported, but a distinct syndrome has not been definitively established.

Observation:

• Two unrelated infants presented with clinical and cytogenetic findings consistent with trisomy for varying segments of chromosome 3 long arm.
• Detailed clinical examinations and chromosomal analyses were performed on both infants.

Findings:

• The study confirms the existence of a distinct trisomy 3q syndrome based on the presented cases and comparison with prior literature.
• The findings support that specific duplications of chromosome 3 long arm lead to a recognizable pattern of anomalies.

Implications:

• This confirmation aids in the diagnosis and understanding of trisomy 3q syndrome.
• Further research into genotype-phenotype correlations in trisomy 3q is warranted.
• The study also addresses the gene assignment for human red blood cell galactose-1-uridyltransferase.