rs12061941 (GRHL3): Cleft Palate Gene Variant

Key takeaways

• GRHL3 at chromosome 1p36 is one of a small number of genes where a causal variant for isolated cleft palate has been confirmed through genome-wide association studies
• A missense change (a DNA mutation that alters the protein amino acid sequence) in this gene disrupts the transactivation function of the transcription factor it encodes
• GRHL3 and IRF6 act together in a regulatory network controlling oral periderm (a protective embryonic cell layer) differentiation; disrupting either predisposes to cleft palate
• The specific variant rs12061941 is not directly examined in the available study; findings here describe the broader GRHL3 1p36 locus
• No lifestyle or dietary associations are documented in the available evidence

What the research says A missense variant in the GRHL3 gene (Grainyhead-like transcription factor 3, located at chromosome 1p36) has been identified as causative for isolated cleft palate (CP), making it unusual among orofacial cleft loci in that the causal change is a coding mutation that directly disrupts the transactivation function of the encoded transcription factor. This gene is important for keratinocyte (a skin cell type) and periderm differentiation, and in zebrafish models Grhl3 functions downstream of Irf6 within the same periderm differentiation pathway. Perturbation of the IRF6-GRHL3 regulatory network, which orchestrates differentiation of the oral periderm, is proposed to underlie susceptibility to CP.

Reported associations

• Isolated cleft palate: a missense variant at the GRHL3 1p36 locus has been identified as causative for CP; no effect size is reported for this specific variant in the available study text
• Keratinocyte and periderm differentiation: GRHL3 is required for proper differentiation of these cell types, processes essential to normal palate closure
• Orofacial cleft susceptibility via the IRF6-GRHL3 pathway: variants in either GRHL3 or IRF6 disrupt a shared network controlling oral periderm development and are each associated with orofacial clefts

Evidence quality The available study does not directly investigate rs12061941 or report association statistics specific to this variant; no sample size, p-value, or effect size is provided for a GRHL3 variant in the provided text. GRHL3 is cited as a previously confirmed candidate gene from prior genome-wide association studies among 15 loci associated with CP, while the primary finding of the available study concerns a different variant (rs570516915) at the IRF6 locus in the Finnish population (OR = 8.65, 95% CI 6.11-12.25, P = 5.25 x 10^-34, replicated in independent Finnish and Estonian CP cohorts). LINC02800, a long intergenic non-coding RNA adjacent to GRHL3, is not discussed in the available literature. All findings here reflect background information about the GRHL3 locus cited within the study; evidence directly linking rs12061941 to any trait is not present in the provided sources, and this entry should be considered preliminary.

Lifestyle considerations No lifestyle considerations on file for this variant.