Cleft Lip/Palate

1. Disease Information

Overview

Cleft lip and/or palate (CL/P) represents the most common congenital craniofacial malformation worldwide, affecting approximately 1 in 700 live births (ma2025burdenoforofacial pages 1-2, im2025molecularregulationof pages 5-6). The condition results from failure of fusion of the facial processes during embryogenesis, leading to structural discontinuity of the lip, alveolus, and/or palate (won2023generegulatorynetworks pages 1-2). Craniofacial development relies on proper growth and fusion of initially distinct collections of mesenchyme derived from the cranial neural crest, covered by epithelium of ectodermal origin (won2023generegulatorynetworks pages 1-2). Perturbation of the coordinated morphogenetic events underlying these processes—including cell migration, survival, proliferation, death, patterning, adhesion, and differentiation—can lead to orofacial cleft phenotypes (won2023generegulatorynetworks pages 1-2).

Key Identifiers

• MONDO: MONDO:0016044 (cleft lip/palate)
• OMIM: Multiple entries including #119530 (CL/P nonsyndromic), #119300 (Van der Woude syndrome with IRF6)
• ICD-10: Q35 (Cleft palate), Q36 (Cleft lip), Q37 (Cleft palate with cleft lip)
• ICD-11: LA20.0 (Cleft lip), LA20.1 (Cleft palate), LA20.2 (Cleft lip with cleft palate)
• MeSH: D002971 (Cleft Lip), D002972 (Cleft Palate)
• Orphanet: ORPHA:199306 (Cleft lip/palate)

Synonyms and Alternative Names

Common synonyms include: orofacial cleft (OFC), harelip (archaic), cheiloschisis (cleft lip), palatoschisis (cleft palate), CL/P, NSCL/P (nonsyndromic cleft lip with or without palate), CLP (cleft lip with cleft palate), CPO (cleft palate only). The condition is classified into three main subtypes: cleft lip only (CL), cleft palate only (CP), and cleft lip with cleft palate (CLP) (jaruga2022orofacialcleftand pages 3-5).

Data Sources

The information herein is derived from aggregated disease-level resources including population-based epidemiological studies (Global Burden of Disease), molecular genetic research (GWAS, WES, WGS), curated disease-gene databases (OpenTargets, ClinVar, OMIM), clinical trial registries, and primary research literature.

2. Etiology

Disease Causal Factors

CL/P has a complex, multifactorial etiology involving interactions between genetic susceptibility and environmental exposures. Approximately 93–97% of cases are nonsyndromic (NSCLP), arising from cumulative effects of multiple genetic alterations with modest effect sizes interacting with environmental factors (im2025molecularregulationof pages 5-6). The remaining 5–7% are syndromic, associated with over 400 genetic syndromes following Mendelian inheritance patterns (jaruga2022orofacialcleftand pages 3-5).

Genetic Risk Factors

Major susceptibility genes identified through GWAS, linkage studies, and sequencing include IRF6, MSX1, ARHGAP29, CTNND1, PAX7, TP63, CDH1, BMP4, NTN1, NECTIN1, FOXE1, TGFB3, GRHL3, and others (OpenTargets Search: cleft lip,cleft palate, jaruga2022orofacialcleftand pages 5-6, cheng2023geneticinheritancemodels pages 2-5, im2025molecularregulationof pages 5-6). IRF6 is the most extensively validated susceptibility gene, with heterozygous pathogenic mutations causing Van der Woude syndrome (the most common syndromic form, affecting ~15% of patients) and common regulatory variants contributing to nonsyndromic risk (cheng2023geneticinheritancemodels pages 2-5, rahimov2024highincidenceand pages 1-4). MSX1 and IRF6 are the only two genes in which rare mutations contribute to both syndromic and nonsyndromic forms of CL/P and CP (rahimov2024highincidenceand pages 1-4). Linkage analysis has identified over 20 chromosomal regions linked to NSCLP, including 1p36, 2p21, 3p11.1, 8q21.3, 8q24, 13q31.1, and 15q22 (cheng2023geneticinheritancemodels pages 5-6, im2025molecularregulationof pages 6-8). Patients with a positive family history have up to a 32-fold increased risk, with an estimated recurrence risk of 4–10% (im2025molecularregulationof pages 5-6, jaruga2022orofacialcleftand pages 5-6).

The following table summarizes the key genes implicated in CL/P with their functions and association evidence:

Table: This table summarizes high-priority genes implicated in cleft lip and/or palate, integrating curated disease-target associations with mechanistic and genetic evidence. It is useful for building a disease knowledge base entry and prioritizing genes for annotation, diagnostics, and pathway analysis.

Environmental Risk Factors

Multiple modifiable environmental risk factors have been identified. Maternal smoking is a significant risk factor with odds ratios ranging from 1.3–1.8 for unilateral CLP and up to 4.2 for bilateral cases when exceeding 25 cigarettes daily (viswapurna2024roleofepigenetics pages 3-4). Folate deficiency during the first trimester increases cleft lip risk 4.36-fold (viswapurna2024roleofepigenetics pages 3-4). Additional risk factors include maternal pre-pregnancy diabetes mellitus (OR 1.96), maternal obesity (OR 1.32 for grade II and extreme obesity), pre-pregnancy hypertension (OR 1.17), use of assisted reproductive technology (OR 1.40), maternal alcohol consumption, air pollutant exposure (PM2.5, PM10, ozone, carbon monoxide), teratogenic medications (corticosteroids, phenytoin), and TCDD/dioxin exposure (viswapurna2024roleofepigenetics pages 3-4, im2025molecularregulationof pages 46-47, iwaya2023micrornasandgene pages 10-12).

Protective Factors

Periconceptional folic acid supplementation (≥400 µg/day during the first four weeks of gestation) is the most well-established protective factor, supporting folate-dependent one-carbon metabolism, nucleotide synthesis, and methylation during neural crest and palatal development (viswapurna2024roleofepigenetics pages 3-4, im2025molecularregulationof pages 46-47, viswapurna2024roleofepigenetics pages 7-8).

Gene-Environment Interactions

Significant gene-environment interactions have been documented. Infants born to smoking mothers carrying the MSX1 susceptibility genotype have a 7.16-fold increased cleft risk (viswapurna2024roleofepigenetics pages 2-3). The RUNX2 genetic variant also increases cleft risk with maternal smoking exposure (viswapurna2024roleofepigenetics pages 3-4). Polymorphisms in TGF-α, TGFB3, and BMP4 interact with smoking to increase OFC risk (im2025molecularregulationof pages 36-37). MTHFR polymorphisms (C677T, 1298A>C) modify the impact of folate deficiency on cleft risk (viswapurna2024roleofepigenetics pages 3-4, alghonemy2025metaanalysisandsystematic pages 7-7).

The following table provides a detailed summary of environmental risk and protective factors:

Table: This table summarizes major environmental and gene-environment contributors to cleft lip/palate risk, including effect sizes where available. It is useful for etiologic annotation, prevention planning, and linking modifiable exposures to molecular susceptibility pathways.

3. Phenotypes

Clinical Features

CL/P phenotypes are characterized by structural discontinuity in the lip and/or palate, resulting in impairment of multiple critical functions (jaruga2022orofacialcleftand pages 3-5). The most common presentation is unilateral cleft lip and palate (UCLP, 30–35%), followed by isolated CL or CP (20–25% each), with bilateral cleft lip and palate (BCLP) being least common (10%) (wongsirichat2022theprevalenceof pages 2-5). Unilateral clefts are twice as frequent on the left side (jaruga2022orofacialcleftand pages 3-5).

Feeding difficulties (HP:0011968): Cleft lip prevents proper nipple seal during breastfeeding, while cleft palate prevents negative pressure generation needed for milk intake and impairs tongue compression, leading to poor nutrition and inadequate weight gain (wongsirichat2022theprevalenceof pages 2-5, jaruga2022orofacialcleftand pages 3-5). Surgical palatal repair improved feeding in 79% of cases (wongsirichat2022theprevalenceof pages 5-6, wongsirichat2022theprevalenceof pages 2-5).

Speech and language impairment (HP:0000750): Patients manifest atypical consonant production, abnormal nasal resonance (hypernasality), and delayed language acquisition. Velopharyngeal insufficiency (VPI) requiring surgical intervention occurs in approximately 59% of bilateral cleft patients (wongsirichat2022theprevalenceof pages 5-6, hattori2023longtermtreatmentoutcome pages 1-2).

Hearing loss/otitis media (HP:0000365, HP:0000388): High rates of otitis media with effusion and hearing problems are documented in CL/P patients (NCT00829101 chunk 1).

Dental anomalies (HP:0000164): Dental development is delayed an average of 6–7 months compared to unaffected children. Complications include hypodontia, malocclusion, transverse maxillary arch collapse with crossbite, crowding, and incisor retroclination (wongsirichat2022theprevalenceof pages 5-6, jaruga2022orofacialcleftand pages 3-5).

Maxillary growth impairment (HP:0000347): Maxillary underdevelopment is a significant complication, with skeletal class III anteroposterior deficiency occurring in operated cleft patients (wongsirichat2022theprevalenceof pages 2-5). Orthognathic surgery was required in 60.7% of BCLP patients with midface retrusion (hattori2023longtermtreatmentoutcome pages 1-2).

Quality of Life Impact: CL/P causes major morbidity throughout life as a result of problems with facial appearance, feeding, speaking, obstructive apnea, hearing, and social adjustment, requiring complex multidisciplinary care at considerable cost to healthcare systems worldwide (wongsirichat2022theprevalenceof pages 1-2).

Suggested HPO Terms

• HP:0000175 (Cleft palate)
• HP:0000204 (Cleft upper lip)
• HP:0000202 (Cleft lip and palate)
• HP:0011968 (Feeding difficulties)
• HP:0000750 (Delayed speech and language development)
• HP:0000164 (Abnormality of the dentition)
• HP:0000347 (Micrognathia/maxillary hypoplasia)
• HP:0000365 (Hearing impairment)
• HP:0000388 (Otitis media)

4. Genetic/Molecular Information

Causal Genes and Pathogenic Variants

For syndromic forms, IRF6 (OMIM 607199) heterozygous pathogenic mutations cause Van der Woude syndrome (autosomal dominant); CDH1 heterozygous mutations cause blepharocheilodontic syndrome; TP63 mutations are associated with ectrodactyly-ectodermal dysplasia-cleft syndrome, Hay-Wells syndrome, and Rapp-Hodgkin syndrome (cheng2023geneticinheritancemodels pages 2-5, cheng2023geneticinheritancemodels pages 5-6). A regulatory variant (rs570516915) disrupting an IRF6 transcription factor binding site in an enhancer was identified as strongly associated with CP in the Finnish population (rahimov2024highincidenceand pages 1-4).

For nonsyndromic forms, pathogenic variants in CTNND1, PLEKHA5, and ESRP2 influence epithelial Cadherin-p120-Catenin complex expression (cheng2023geneticinheritancemodels pages 5-6, im2025molecularregulationof pages 15-16). Whole-genome sequencing in 130 African case-parent trios identified high-confidence protein-altering de novo mutations in ACTL6A, ARHGAP10, MINK1, TMEM5, TTN, DHRS3, DLX6, EPHB2, SHH, and TP63, among others (alhazmi2024theapplicationof pages 1-3).

GWAS Loci

Major GWAS-identified susceptibility regions include 1p36, 2p21, 3p11.1, 8q21.3, 8q24, 13q31.1, and 15q22 (cheng2023geneticinheritancemodels pages 5-6). Key SNPs include rs8001641, rs58593329, rs7650466, rs2235371, rs4791774, rs6072081, and rs76479869 in TP63 (jaruga2022orofacialcleftand pages 5-6, cheng2023geneticinheritancemodels pages 2-5, cheng2023geneticinheritancemodels pages 5-6). Fifteen GWAS loci for cleft palate specifically include candidate genes GRHL3, IRF6, CTNNA2, PTCH1, YAP1, PAX9, and others (rahimov2024highincidenceand pages 1-4).

Epigenetic Information

DNA methylation alterations are involved in CL/P etiology. Hypomethylated genes include MYC, FAT1, WHSC1, VAX1, NTN1, BICC1, and MTHFR, while hypermethylated genes include IRF6, TBX1, CRISPLD2, WNT3A, GLI2, SOX2, and PITX2 (viswapurna2024roleofepigenetics pages 4-5). MicroRNAs serve as critical epigenetic regulators: miR-21, miR-181a, miR-452, miR-133b, miR-374a-5p, miR-497-5p, miR-27b, and miR-205 regulate genes involved in cell proliferation, apoptosis, and EMT during palatal development (im2025molecularregulationof pages 23-24, iwaya2023micrornasandgene pages 4-6, im2025molecularregulationof pages 24-26). The mir-17-92 cluster is functionally associated with mammalian CL/P and regulates TGF-β signaling (im2025molecularregulationof pages 24-26). Histone modifications including H3K4 methylation and H4R3me2a (via PRMT1), and regulation by HDAC3 and HDAC4, contribute to palatogenesis (im2025molecularregulationof pages 23-24).

5. Environmental Information

Environmental teratogens are detailed in Section 2 above. Key lifestyle factors include maternal cigarette smoking (vasoconstriction, DNA methylation changes, oxidative stress) (im2025molecularregulationof pages 36-37), alcohol consumption (inhibition of retinoic acid biosynthesis via acetaldehyde) (im2025molecularregulationof pages 46-47), and inadequate dietary folate intake. Occupational and ambient environmental exposures include air pollutants (PM2.5, PM10, ozone, CO) during early gestation and TCDD/dioxin exposure through histone acetylation and microRNA dysregulation mechanisms (viswapurna2024roleofepigenetics pages 3-4, im2025molecularregulationof pages 46-47).

6. Mechanism / Pathophysiology

Molecular Pathways

Palatogenesis is regulated by a complex network of signaling pathways including TGF-β, BMP, SHH, WNT, and FGF, which control palatal shelf outgrowth, elevation, adhesion, and fusion (won2023generegulatorynetworks pages 1-2, im2025molecularregulationof pages 12-13, won2023generegulatorynetworks pages 5-7). These pathways operate through reciprocal epithelial-mesenchymal interactions along the anterior-posterior axis (won2023generegulatorynetworks pages 4-5).

Table: This table summarizes the core developmental signaling pathways implicated in palatogenesis and cleft lip/palate pathogenesis, linking pathway-level functions to disruption phenotypes and representative mouse models. It is useful for connecting mechanistic biology with disease annotations and experimental systems.

Cellular Processes

The causal chain from initial trigger to clinical manifestation involves: (1) Cranial neural crest cell (NCC) specification, migration, and colonization of the facial primordia (upstream); (2) Palatal shelf outgrowth from maxillary prominences regulated by SHH-FGF feedback loops and BMP signaling (intermediate); (3) Palatal shelf elevation above the tongue; (4) Shelf contact, epithelial adhesion, midline epithelial seam (MES) formation, and periderm removal; and (5) MES dissolution through apoptosis and epithelial-mesenchymal transition (EMT), achieving mesenchymal continuity (downstream) (im2025molecularregulationof pages 15-16, won2023generegulatorynetworks pages 8-10, im2025molecularregulationof pages 16-18).

Key cell types involved include cranial neural crest-derived mesenchyme (CL:0000008, neural crest cell), palatal epithelium, periderm cells, and medial edge epithelium (MEE). Periderm cells express CEACAM1 and undergo desquamation regulated by Snai1/Snai2-mediated E-cadherin downregulation and TGF-β3 signaling, which is essential for palatal fusion (im2025molecularregulationof pages 16-18).

GO Terms for Biological Processes

• GO:0060021 (palate development)
• GO:0060022 (hard palate development)
• GO:0060023 (soft palate development)
• GO:0001843 (neural tube closure)
• GO:0001838 (neural crest cell migration)
• GO:0001837 (epithelial to mesenchymal transition)
• GO:0006915 (apoptotic process)
• GO:0042476 (odontogenesis)

7. Anatomical Structures Affected

Organ and Tissue Level

• Primary structures: Upper lip (UBERON:0001833), primary palate (UBERON:0005620), secondary palate (hard palate UBERON:0003216, soft palate UBERON:0001785), alveolar ridge (UBERON:0004535)
• Secondary involvement: Nasal cavity (communication due to oronasal fistula), middle ear (otitis media), dentition, maxilla (UBERON:0002397)
• Body systems: Craniofacial (UBERON:0007811), digestive (feeding impairment), respiratory (obstructive apnea), auditory

Cell Types

• Cranial neural crest cells (CL:0000008)
• Palatal mesenchymal cells
• Oral epithelial cells (CL:0002251)
• Periderm cells
• Osteoblasts (CL:0000062)

Lateralization

Unilateral clefts are approximately twice as common as bilateral clefts, with left-sided clefts being more frequent than right-sided (jaruga2022orofacialcleftand pages 3-5).

8. Temporal Development

Onset

CL/P is congenital, with the developmental defect occurring during weeks 4–12 of embryogenesis. Upper lip fusion occurs during weeks 4–8, while secondary palate fusion occurs during weeks 6–12. The condition is detectable prenatally via ultrasound.

Progression

CL/P itself is a static structural malformation present at birth, but its consequences are lifelong and progressive in terms of functional impact on feeding (neonatal), speech (childhood), dental development (childhood–adolescence), and maxillofacial growth (adolescence–adulthood) (wongsirichat2022theprevalenceof pages 5-6, hattori2023longtermtreatmentoutcome pages 1-2, wongsirichat2022theprevalenceof pages 1-2). Cleft patients show lower weight and smaller size compared to non-cleft children, with maxillary underdevelopment peaking in adulthood (wongsirichat2022theprevalenceof pages 2-5).

Critical Periods

• Weeks 4–8 gestation: lip/primary palate fusion (critical window for CL)
• Weeks 6–12 gestation: secondary palate fusion (critical window for CP)
• First trimester: maximum sensitivity to environmental teratogens (viswapurna2024roleofepigenetics pages 3-4, iwaya2023micrornasandgene pages 10-12)

9. Inheritance and Population

Epidemiology

In 2021, there were approximately 4,124,007 prevalent cases of orofacial clefts globally, with an age-standardized prevalence rate of 53.4 per 100,000 population (wang2025globalregionaland pages 1-2, ma2025burdenoforofacial pages 1-2). The global incidence is approximately 1 in 700 live births (ma2025burdenoforofacial pages 1-2). From 1990–2021, prevalence decreased 40.38%, mortality decreased 86.08%, and DALYs decreased 68.33% (ma2025burdenoforofacial pages 1-2). Over 80% of the burden is borne by low- and middle-income countries (ma2025burdenoforofacial pages 1-2, ma2025burdenoforofacial pages 7-9).

The total prevalence per 10,000 births from 2016–2021 in the United States was 4.88, with 5.96 for males and 3.75 for females (viswapurna2024roleofepigenetics pages 3-4). International surveillance data report a CLP prevalence of 6.4 per 10,000 births (goldrick2023amultiprogramanalysis pages 8-10).

Inheritance Pattern

NSCLP follows multifactorial/polygenic inheritance with both genetic and environmental contributions (cheng2023geneticinheritancemodels pages 2-5, im2025molecularregulationof pages 5-6). Syndromic forms follow Mendelian patterns (autosomal dominant for Van der Woude syndrome/IRF6, etc.) (cheng2023geneticinheritancemodels pages 2-5).

Population Demographics

Males have a higher prevalence of CL/P than females (male:female ratio approximately 1.6:1), while isolated CP shows more equal sex distribution (wang2025globalregionaland pages 1-2, wang2023globalregionaland pages 1-2, jaruga2022orofacialcleftand pages 3-5). Ethnic variation is notable: American Indians show the highest rate (3.6 per 1,000), followed by Asians and Whites, with African Americans having the lowest incidence (~0.5 per 1,000) (im2025molecularregulationof pages 5-6, jaruga2022orofacialcleftand pages 3-5). Geographically, CL/P occurs more frequently in China, Japan, and Latin America but is less common in Israel, South Africa, and Southern Europe (jaruga2022orofacialcleftand pages 3-5). In 2021, South Asia, North Africa/Middle East, and Central Asia had the highest prevalence rates (wang2025globalregionaland pages 1-2, ma2025burdenoforofacial pages 1-2).

10. Diagnostics

Clinical Diagnosis

CL/P is primarily diagnosed by physical examination at birth. Prenatal detection via ultrasound is possible, particularly for cleft lip; cleft palate alone is more difficult to detect prenatally. AI-based prenatal ultrasound systems utilizing deep learning (e.g., YOLOv5) have achieved AUC of 0.971 for standard coronal nasal-lip sections in single-center studies (wongsirichat2022theprevalenceof pages 5-6).

Genetic Testing

Given the complex genetic architecture, genetic testing approaches include: - Chromosomal microarray (CMA): For detecting copy number variants and regions of homozygosity - Gene panels: Targeting known CL/P genes (IRF6, MSX1, CDH1, TP63, ARHGAP29, CTNND1, etc.) - Whole exome/genome sequencing (WES/WGS): For identifying rare de novo and inherited variants, particularly useful in unexplained syndromic presentations - Karyotyping: For ruling out chromosomal abnormalities in syndromic cases

Differential Diagnosis

• Isolated CL vs. CLP vs. CP
• Nonsyndromic vs. syndromic forms (>400 syndromes including Van der Woude, Pierre Robin, DiGeorge/22q11.2 deletion, Treacher Collins, EEC syndrome)
• Submucosal cleft palate (may be clinically occult)

Screening

Prenatal ultrasound (routine second-trimester anatomy scan), newborn physical examination. Cascade genetic testing is recommended for families with affected members.

11. Outcome/Prognosis

Survival and Mortality

Global mortality from orofacial clefts was 1,719 deaths in 2021, with 408,775 DALYs (ma2025burdenoforofacial pages 1-2). Mortality has declined 86.08% from 1990–2021 globally (ma2025burdenoforofacial pages 1-2). Isolated CLP cases have the highest survival rate at 97.7%, while cases associated with genetic/chromosomal syndromes have significantly worse survival at 40.9% (goldrick2023amultiprogramanalysis pages 8-10). Long-term outcomes include increased mortality compared with unaffected siblings (wongsirichat2022theprevalenceof pages 1-2).

Morbidity

The age-standardized DALY rate was 5.8 per 100,000 in 2021, with burden strongly correlating with socioeconomic development (wang2025globalregionaland pages 1-2, ma2025burdenoforofacial pages 7-9). Morbidity is lifelong, encompassing feeding difficulties, speech impairment, hearing loss, dental anomalies, psychological/social impacts, and maxillofacial growth disturbances (wongsirichat2022theprevalenceof pages 1-2).

Treatment Burden

Patients with complete BCLP require an average of 5.9 surgical operations to complete treatment (hattori2023longtermtreatmentoutcome pages 1-2). Revisional lip/nose surgery was performed in 73% of patients, with VPI surgery in 59% and orthognathic surgery in 60.7% (hattori2023longtermtreatmentoutcome pages 1-2, hattori2023longtermtreatmentoutcome pages 5-6).

12. Treatment

Surgical Interventions (MAXO:0000004, Surgical procedure)

Treatment follows a staged, multidisciplinary protocol: - Presurgical nasoalveolar molding (NAM): Performed in early infancy to approximate cleft segments - Lip adhesion: ~3 months of age (in selected cases) - Primary cheiloplasty (lip repair): ~3–8 months (MAXO:0000004) - Palatoplasty (palate repair): ~12–18 months, typically two-flap technique (NCT00829101 chunk 1, hattori2023longtermtreatmentoutcome pages 1-2, hattori2023longtermtreatmentoutcome pages 5-6) - VPI surgery: As needed (pharyngeal flap or sphincter pharyngoplasty) - Alveolar bone grafting: ~9–10 years of age - Orthodontic treatment: Throughout childhood and adolescence - Orthognathic surgery: At skeletal maturity (~18 years), applied in 60.7% of BCLP patients with midface retrusion; 97.3% underwent two-jaw surgery (hattori2023longtermtreatmentoutcome pages 1-2) - Revisional rhinoplasty/lip surgery: After skeletal maturity for esthetic enhancement (hattori2023longtermtreatmentoutcome pages 5-6)

Supportive and Rehabilitative Care

• Speech therapy (MAXO:0000930): Essential for managing VPI and articulation disorders
• Audiology management: Monitoring for otitis media and hearing loss
• Psychological support (MAXO:0000016): Addressing social adjustment and self-esteem
• Nutritional support: Specialized feeding techniques and devices in infancy

Experimental Treatments

Active clinical trials include: - BIOCLEFT (NCT06408337): Phase I-IIa evaluating safety and efficacy of a tissue-engineered product for cleft palate treatment - AI applications (NCT04342234, NCT06970158): Neural network-based morphological assessment and clinical decision support - Analgesic innovations (NCT04928352, NCT04771156): Nebulized bupivacaine and ketorolac for post-palatoplasty pain management

13. Prevention

Primary Prevention

• Folic acid supplementation: Periconceptional supplementation (≥400 µg/day) is the most established primary prevention strategy (viswapurna2024roleofepigenetics pages 3-4, im2025molecularregulationof pages 46-47, viswapurna2024roleofepigenetics pages 7-8)
• Smoking cessation: Given the significant dose-dependent risk (OR up to 4.2 for heavy smoking) (viswapurna2024roleofepigenetics pages 3-4)
• Maternal health optimization: Managing pre-pregnancy diabetes, hypertension, and obesity (viswapurna2024roleofepigenetics pages 3-4)
• Avoidance of teratogens: Including excess alcohol, retinoids, and certain medications during first trimester

Secondary Prevention

• Prenatal ultrasound screening: Routine second-trimester anatomy scan for early detection
• Genetic counseling (MAXO:0000079): Risk assessment for families with history of CL/P, particularly given 4–10% recurrence risk (im2025molecularregulationof pages 5-6)
• Preimplantation genetic diagnosis: Available for known monogenic syndromic forms

Tertiary Prevention

• Multidisciplinary team care: Preventing complications through coordinated surgical, orthodontic, speech, audiology, and psychological management from birth through adulthood (hattori2023longtermtreatmentoutcome pages 1-2, wongsirichat2022theprevalenceof pages 1-2)

14. Other Species / Natural Disease

Orofacial clefts occur naturally in multiple species, most notably in dogs (particularly brachycephalic breeds including Bulldogs, Boxers, and Labrador Retrievers), cats, cattle, sheep, and horses. The condition is documented in OMIA (Online Mendelian Inheritance in Animals).

Comparative Biology

The developmental mechanisms underlying palatal fusion are highly conserved across vertebrates. Key signaling pathways (SHH, BMP, FGF, TGF-β, WNT) controlling palatogenesis are conserved from zebrafish to humans, enabling cross-species study of cleft mechanisms (alhazmi2024theapplicationof pages 1-3, jaruga2022orofacialcleftand pages 13-15).

15. Model Organisms

Mouse Models (Mus musculus; NCBI Taxon: 10090)

The mouse is the preeminent animal model for studying CL/P, with 395 genes identified in mice and 131 in humans related to cleft palate as of 2021 (iwaya2023micrornasandgene pages 6-8). A total of 365 mouse strains exhibit complete cleft of the secondary palate (CPO), 44 strains show CLP, 14 display anterior cleft palate, 16 present posterior/soft palate cleft, and 37 have submucous cleft palate (iwaya2023micrornasandgene pages 6-8). Key knockout models include: - Fgf10−/−: Cleft palate with impaired palatal shelf outgrowth (won2023generegulatorynetworks pages 4-5) - Msx1-null: Cleft palate, rescued by Dlx5 modulation of Shh signaling (won2023generegulatorynetworks pages 13-14) - Tgfbr2 conditional inactivation in cranial neural crest: Cleft palate and calvarial defects (won2023generegulatorynetworks pages 13-14) - Osr2−/−; Pax9−/−: Cleft palate (won2023generegulatorynetworks pages 4-5) - Foxf1/Foxf2 ablation in neural crest: Defective palatal outgrowth (won2023generegulatorynetworks pages 4-5) - DicerF/F;Wnt1-Cre: Severe craniofacial deformities including cleft palate (iwaya2023micrornasandgene pages 2-4) - Bmpr1a conditional loss in neural crest: Severe craniofacial defects (im2025molecularregulationof pages 12-13)

Zebrafish Models (Danio rerio; NCBI Taxon: 7955)

Zebrafish have emerged as a powerful complementary model. The zebrafish ethmoid plate serves as the functional equivalent of the mammalian palate. Genetic control of palatal development is conserved across vertebrates, enabling study of human cleft genes (alhazmi2024theapplicationof pages 1-3, jaruga2022orofacialcleftand pages 13-15). IRF6-deficient zebrafish demonstrate a cleft phenotype, with downstream genes GRHL3, KLF17, and ESRP1/2 also critical (alhazmi2024theapplicationof pages 1-3). Advantages include transparent embryos, rapid external development, and amenability to CRISPR/Cas9 editing (alhazmi2024theapplicationof pages 1-3, jaruga2022orofacialcleftand pages 13-15).

Xenopus Models (NCBI Taxon: 8364)

Xenopus has emerged as a powerful model for investigating craniofacial morphogenesis, owing to external fertilization, large experimentally accessible embryos, and evolutionarily conserved developmental pathways. These allow direct in vivo visualization and manipulation of cranial neural crest cell behaviors at single-cell resolution (jaruga2022orofacialcleftand pages 13-15).

Model Limitations

Mouse palate development occurs in utero, limiting real-time observation (jaruga2022orofacialcleftand pages 13-15). Zebrafish, while genetically manipulable, have anatomical differences from mammalian palates (alhazmi2024theapplicationof pages 1-3). No single model fully recapitulates all aspects of human CL/P, necessitating multi-model approaches (jaruga2022orofacialcleftand pages 13-15).

Summary

Cleft lip and/or palate is a complex congenital malformation with global prevalence of approximately 1 in 700 births, imposing substantial morbidity particularly in low- and middle-income countries. The condition arises from disrupted palatogenesis involving multiple conserved signaling pathways (TGF-β, BMP, SHH, WNT, FGF) and is influenced by both genetic susceptibility (IRF6, MSX1, BMP4, TP63, ARHGAP29, and many others) and environmental factors (maternal smoking, folate deficiency, diabetes). Treatment requires lifelong, staged, multidisciplinary management including multiple surgical procedures, orthodontic care, speech therapy, and psychological support. Primary prevention through periconceptional folic acid supplementation and maternal health optimization represents the most actionable public health intervention. Advances in genomics, AI-assisted diagnostics, and tissue engineering (BIOCLEFT trial) represent promising frontiers in CL/P research and care.

References

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37. (won2023generegulatorynetworks pages 5-7): Hyung-Jin Won, Jin-Woo Kim, Hyung-Sun Won, and Jeong-Oh Shin. Gene regulatory networks and signaling pathways in palatogenesis and cleft palate: a comprehensive review. Cells, 12:1954, Jul 2023. URL: https://doi.org/10.3390/cells12151954, doi:10.3390/cells12151954. This article has 34 citations.

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45. (iwaya2023micrornasandgene pages 6-8): Chihiro Iwaya, Akiko Suzuki, and Junichi Iwata. Micrornas and gene regulatory networks related to cleft lip and palate. International Journal of Molecular Sciences, 24:3552, Feb 2023. URL: https://doi.org/10.3390/ijms24043552, doi:10.3390/ijms24043552. This article has 22 citations.

46. (iwaya2023micrornasandgene pages 2-4): Chihiro Iwaya, Akiko Suzuki, and Junichi Iwata. Micrornas and gene regulatory networks related to cleft lip and palate. International Journal of Molecular Sciences, 24:3552, Feb 2023. URL: https://doi.org/10.3390/ijms24043552, doi:10.3390/ijms24043552. This article has 22 citations.

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