Current concepts on cleft lip and palate etiology

Area of Science:

• Craniofacial anomalies
• Developmental biology
• Public health

Background:

• Nonsyndromic cleft lip with or without cleft palate (CL/P) is a frequent congenital anomaly, affecting approximately 1 in 700 live births globally.
• CL/P encompasses various classifications including cleft palate only (CPO), cleft lip only (CLO), and cleft lip and palate (CLP), each with distinct embryologic origins.
• While genetic factors are implicated, gene-environment interactions are increasingly recognized as crucial in the etiology of CL/P.

Purpose of the Study:

• To review the current understanding of environmental factors contributing to the onset of nonsyndromic cleft lip and palate.
• To highlight the role of gene-environment interactions in the development of this common craniofacial anomaly.

Main Methods:

• Literature review of epidemiological studies and genetic association studies.
• Analysis of environmental risk factors and protective elements in CL/P etiology.

Main Results:

• Epidemiological data indicate that environmental factors such as maternal alcohol consumption, smoking, and drug use are associated with an increased risk of CL/P.
• Gene-environment interactions are significant contributors to the development of CL/P.
• Adequate folic acid intake during pregnancy appears to have a protective effect against CL/P.

Conclusions:

• Environmental factors and their interactions with genetic predispositions play a critical role in the etiology of nonsyndromic cleft lip and palate.
• Public health recommendations should emphasize the avoidance of environmental risk factors and the importance of folic acid supplementation during pregnancy.