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Expanding the genotype-phenotype correlation in subtelomeric 19p13.3 microdeletions using high resolution clinical
Sirisha Peddibhotla1, Mohamed Khalifa, Frank J Probst
1Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas; Department of Pediatrics-Hematology-Oncology, Baylor College of Medicine and Texas Children's Cancer Center, Houston, Texas.
American Journal of Medical Genetics. Part A
|October 15, 2013
Summary
This study identifies eight patients with 19p13.3 microdeletions, revealing key developmental and congenital abnormalities. These findings highlight the critical role of subtelomeric 19p13.3 in development.
Area of Science:
- Genetics
- Human Development
- Clinical Medicine
Background:
- Structural rearrangements of chromosome 19p are uncommon, with poorly understood phenotypic outcomes.
- Subtelomeric regions are prone to rearrangements, impacting gene dosage and potentially leading to developmental disorders.
Purpose of the Study:
- To characterize the clinical features and genetic underpinnings of subtelomeric 19p13.3 microdeletions.
- To define the phenotypic spectrum associated with 19p13.3 microdeletions.
- To investigate the molecular mechanisms responsible for these microdeletions.
Main Methods:
- Clinical chromosomal microarray analysis (CMA) was used to identify microdeletions.
- Detailed clinical evaluation of eight affected patients.
- In silico genomic analysis of microdeletion breakpoints.
Main Results:
- Eight patients with subtelomeric 19p13.3 microdeletions (0.1–0.86 Mb) were identified.
- Common clinical features include growth delay, congenital anomalies, global developmental delay, learning difficulties, and dysmorphic facial features.
- Repetitive sequences at breakpoints suggest LINEs/SINEs-mediated deletion events.
Conclusions:
- Subtelomeric 19p13.3 plays a crucial role in embryonic and childhood development.
- Haploinsufficiency of genes within the 19p13.3 region likely contributes to the observed phenotype.
- This study aids clinicians in identifying and managing individuals with 19p13.3 microdeletions.
