Which genetic deletion is commonly tested for in fetuses with conotruncal anomalies?

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Multiple Choice

Which genetic deletion is commonly tested for in fetuses with conotruncal anomalies?

When a fetus shows a conotruncal heart defect, the most commonly tested genetic deletion is the 22q11.2 microdeletion, associated with DiGeorge/Velocardiofacial syndrome. This deletion disrupts development of the pharyngeal arches and neural crest–derived structures, which helps explain why the outflow tract of the heart is affected in these cases. Because 22q11.2 deletions occur fairly often in conotruncal anomalies—significantly affecting prognosis and guiding management for immune function and calcium regulation—prenatal testing for this deletion is routinely pursued. Other deletions listed are linked to different syndromes with their own distinct features, but they do not have the same strong, well-established association with conotruncal heart defects, so they’re not the primary target in this scenario.

When a fetus shows a conotruncal heart defect, the most commonly tested genetic deletion is the 22q11.2 microdeletion, associated with DiGeorge/Velocardiofacial syndrome. This deletion disrupts development of the pharyngeal arches and neural crest–derived structures, which helps explain why the outflow tract of the heart is affected in these cases. Because 22q11.2 deletions occur fairly often in conotruncal anomalies—significantly affecting prognosis and guiding management for immune function and calcium regulation—prenatal testing for this deletion is routinely pursued.

Other deletions listed are linked to different syndromes with their own distinct features, but they do not have the same strong, well-established association with conotruncal heart defects, so they’re not the primary target in this scenario.

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