Collagen XI sequence variations in nonsyndromic cleft palate, Robin sequence and micrognathia

Area of Science:

• Genetics
• Developmental Biology
• Medical Research

Background:

• Cleft palate is a common birth defect with largely unknown causes, though genetics play a role.
• Robin sequence involves micrognathia, glossoptosis, apnea, and cleft palate, often linked to syndromes.
• Mutations in cartilage collagen genes (COL2A1, COL11A1, COL11A2) are implicated in chondrodysplasias associated with Robin sequence and related conditions.

Purpose of the Study:

• To investigate mutations in COL11A2, COL2A1, and COL11A1 in patients with nonsyndromic Robin sequence, cleft palate, and micrognathia.
• To determine the role of these specific collagen genes in the etiology of these craniofacial birth defects.

Main Methods:

• Analyzed a cohort of 24 nonsyndromic Robin sequence patients for mutations in COL11A2, COL2A1, and COL11A1.
• Screened 17 nonsyndromic cleft palate patients and 21 nonsyndromic micrognathia patients for COL11A2 mutations.
• Identified and characterized disease-associated mutations and sequence variations in the target genes.

Main Results:

• Detected two disease-associated mutations in COL11A2 and COL11A1 in Robin sequence patients.
• Identified putatively disease-associated variations in COL11A1, COL11A2, and COL2A1 across the patient cohorts.
• Confirmed that sequence variations in these cartilage collagen genes can contribute to Robin sequence, cleft palate, and micrognathia.

Conclusions:

• Mutations in COL2A1, COL11A1, and COL11A2 are implicated in the genetic basis of some nonsyndromic Robin sequence, cleft palate, and micrognathia cases.
• These genetic variations are not the predominant cause for these common birth defects.
• Further research is warranted to fully elucidate the etiopathogenesis of these conditions.