TGFbeta3 expression in non-syndromic orofacial clefts.

Area of Science:

• Genetics
• Developmental Biology
• Oral and Maxillofacial Surgery

Background:

• Non-syndromic clefts encompass cleft palate only (CPO) and cleft lip/alveolus with or without palate (CL+/-P), with complex genetic and environmental origins.
• Previous research suggests a potential involvement of transforming growth factor beta 3 (TGFbeta3) in cleft development, but findings remain inconclusive.

Purpose of the Study:

• To investigate the expression levels of TGFbeta3 in non-syndromic cleft patients compared to unaffected controls.
• To determine if TGFbeta3 plays a role in the pathogenesis of different cleft subtypes.

Main Methods:

• Analysis of TGFbeta3 protein expression in tissue samples from 43 non-syndromic cleft patients and 21 controls using immunohistochemistry.
• Quantification of TGFbeta3 expression in epithelium (EP), minor palatal salivary gland (GL), and elevator palati muscle (MU) via computerized image analysis.
• Statistical analysis performed using the Kruskal-Wallis test.

Main Results:

• A statistically significant lower expression of TGFbeta3 was observed in the minor palatal salivary gland (GL) and epithelium (EP) of non-syndromic cleft individuals compared to controls.
• Comparing cleft subtypes, a significantly lower TGFbeta3 expression was found specifically in the GL of cleft palate only (CPO) patients versus cleft lip/alveolus with or without palate (CL+/-P) patients.

Conclusions:

• The reduced expression of TGFbeta3 in the minor palatal salivary glands of non-syndromic cleft patients suggests a significant pathogenetic role for this protein in the etiology of clefts.
• These findings provide further evidence supporting TGFbeta3's involvement in the development of both CPO and CL+/-P.