The velocardiofacial syndrome: a review

Area of Science:

• Genetics and Molecular Biology
• Human Syndromes and Diseases
• Developmental Biology

Background:

• Velocardiofacial syndrome (VCFS) presents a complex clinical and behavioral phenotype.
• The syndrome arises from an imbalance in gene dosage affecting genes on chromosome 22q11.
• Low copy repeat gene clusters flanking the 22q11 region facilitate unequal crossing over, leading to microdeletions.

Purpose of the Study:

• To investigate the genetic underpinnings of Velocardiofacial syndrome.
• To identify the specific genes involved in the 22q11 deletion that contribute to the syndrome's phenotype.
• To understand the mechanisms leading to gene dosage imbalance in VCFS.

Main Methods:

• Utilizing traditional positional cloning techniques to map the deleted region.
• Employing mouse models to study the effects of genetic alterations.
• Investigating gene dosage effects within the 22q11 region.

Main Results:

• The study focuses on identifying genes within the 22q11 microdeleted region.
• Evidence suggests the involvement of multiple disease genes in the VCFS phenotype.
• The mechanism of unequal crossing over involving low copy repeats is implicated in the deletion.

Conclusions:

• The complex phenotype of Velocardiofacial syndrome is linked to genetic factors on 22q11.
• Further research is needed to pinpoint all causative genes and their roles.
• Positional cloning and animal models are crucial tools for dissecting the genetic basis of VCFS.