[15Q11.2 (BP1-BP2) microdeletion, a new syndrome with variable expressivity]

Area of Science:

• Genetics
• Developmental Biology
• Clinical Medicine

Background:

• Prader-Willi and Angelman syndromes are complex genetic disorders.
• The 15q11.2 region is critical for neurodevelopment.
• Microdeletions in this region can cause distinct clinical phenotypes.

Observation:

• A case study of a young male patient presenting with psychomotor retardation and dysmorphic features.
• Diagnostic analysis revealed a 1.5 Mb microdeletion on chromosome 15q11.2.
• The microdeletion was of paternal origin and confirmed using array comparative genomic hybridization (aCGH).

Findings:

• The identified 15q11.2 microdeletion spans between the BP1 and BP2 breakpoints.
• This specific deletion pattern is associated with the Prader-Willi/Angelman syndromes critical region.
• The patient's clinical presentation closely matches previously reported cases with pure BP1-BP2 deletions.

Implications:

• This case expands the understanding of genotype-phenotype correlations in 15q11.2 microdeletions.
• Highlights the importance of precise genetic diagnostics for neurodevelopmental disorders.
• Further research into the BP1-BP2 deletion may refine diagnostic criteria and therapeutic strategies.