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Direct duplication 2p14 to 2p23.

E Yunis, J González, R Zuñiga

|April 27, 1979

Summary

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This study identified a rare de novo partial 2p trisomy in a newborn initially diagnosed with Smith-Lemli-Opitz syndrome. Genetic analysis revealed a direct duplication from 2p14 to 2p23, a novel chromosomal abnormality.

Area of Science:

Genetics
Clinical Genetics
Human Genetics

Background:

Smith-Lemli-Opitz syndrome is a rare genetic disorder with complex clinical manifestations.
Accurate genetic diagnosis is crucial for understanding disease mechanisms and prognosis.

Observation:

A male newborn presented with malformations, initially suspected to have Smith-Lemli-Opitz syndrome.
Extensive cytogenetic analyses were performed, including various banding techniques (Q, G, C, R, T) and BrdU incorporation.

Findings:

The patient was diagnosed with a de novo partial 2p trisomy.
The specific chromosomal abnormality identified was a direct duplication of the 2p14 to 2p23 region.
Both parents exhibited normal karyotypes, confirming the de novo nature of the mutation.

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Implications:

This case expands the known spectrum of chromosomal abnormalities associated with congenital malformations.
Accurate identification of partial 2p trisomy is essential for genetic counseling and clinical management.
Further research into the phenotypic consequences of 2p duplications is warranted.