Distal 2q duplication in a patient with intellectual disability

Area of Science:

• Genetics
• Human Molecular Genetics
• Clinical Dysmorphology

Background:

• Chromosomal duplications can lead to a range of developmental abnormalities.
• The 2q chromosome region is implicated in various genetic disorders, but specific distal duplications are less understood.
• Identifying novel chromosomal abnormalities is crucial for understanding genotype-phenotype correlations.

Purpose of the Study:

• To report the first molecular-level description of a distal 2q duplication.
• To characterize the clinical phenotype associated with this specific genetic alteration.
• To contribute to the understanding of chromosomal abnormalities and their impact on development.

Main Methods:

• Whole exome sequencing was employed for copy number analysis.
• Detailed clinical examination of the patient was performed.
• Phenotypic features were documented and correlated with genetic findings.

Main Results:

• A 16.4-Mb duplication at 2q36.3-qter was identified in the patient.
• The patient presented with severe intellectual disability, microcephaly, brachycephaly, prominent forehead, hypertelorism, prominent eyes, thin upper lip, and progenia.
• This represents the first molecular characterization of a distal 2q duplication.

Conclusions:

• Distal 2q duplication is associated with severe intellectual disability and a distinct set of dysmorphic features.
• Molecular analysis is essential for precise identification and characterization of chromosomal abnormalities.
• Further research is warranted to delineate the full spectrum of phenotypes associated with distal 2q duplications.