A Boy with an LCR3/4-Flanked 10q22.3q23.2 Microdeletion and Uncommon Phenotypic Features.

Area of Science:

• Genetics
• Genomic Disorders
• Human Genetics

Background:

• The recurrent 10q22.3q23.2 deletion is a rare genomic disorder.
• It is characterized by breakpoints within low copy repeats 3 and 4 (LCR3/4).
• The disorder's phenotype is often uncharacteristic, complicating clinical diagnosis, with speech delay noted in most affected individuals.

Purpose of the Study:

• To report a case of LCR3/4-flanked 10q22.3q23.2 deletion with atypical language development.
• To review previously reported cases and discuss the role of the BMPR1A gene.
• To emphasize the phenotypic variability and need for cautious genetic counseling.

Main Methods:

• Case report of a boy with LCR3/4-flanked 10q22.3q23.2 deletion.
• Standardized language development testing at 2 years and 3 months.
• Review of existing literature on 10q22.3q23.2 deletions.

Main Results:

• The patient exhibited age-appropriate language development.
• A cleft palate was noted, a feature not previously described in patients with this deletion.
• BMPR1A gene's potential role is discussed in the context of the observed phenotype.

Conclusions:

• The phenotype associated with LCR3/4-flanked 10q22.3q23.2 deletion is variable.
• Normal language development can occur despite the deletion.
• Further long-term studies are necessary to fully understand the natural history of this rare disorder.