De Lange Syndrome Research Articles

146 Transient severe T cell lymphopenia in a patient with Cornelia de Lange Syndrome captured by TREC screening

146 Transient severe T cell lymphopenia in a patient with Cornelia de Lange Syndrome captured by TREC screening

Advancing the Clinical and Molecular Understanding of Cornelia de Lange Syndrome: A Multidisciplinary Pediatric Case Series and Review of the Literature.

Cornelia de Lange syndrome (CdLS) is a complex genetic disorder with distinct facial features, growth limitations, and limb anomalies. Its broad clinical spectrum presents significant challenges in pediatric diagnosis and management. Due to cohesin complex mutations, the disorder's variable presentation requires extensive research to refine care and improve outcomes. This article provides a case series review of pediatric CdLS patients alongside a comprehensive literature review, exploring clinical variability and the relationship between genotypic changes and phenotypic outcomes. It also discusses the evolution of diagnostic and therapeutic techniques, emphasizing innovations in genetic testing, including detecting mosaicism and novel genetic variations. The aim is to synthesize case studies with current research to advance our understanding of CdLS and the effectiveness of management strategies in pediatric healthcare. This work highlights the need for an integrated, evidence-based approach to diagnosis and treatment. It aims to fill existing research gaps and advocate for holistic care protocols and tailored treatment plans for CdLS patients, ultimately improving their quality of life.

Assessment of Quality of Life Using the Kidslife Scale in Individuals With Cornelia de Lange Syndrome.

Cornelia de Lange syndrome (CdLS) is a rare polymalformative genetic disorder with multisystemic involvement. Despite numerous clinical and molecular studies, the specific evaluation of the quality of life (QoL) and its relationship with syndrome-specific risk factors has not been explored. The QoL of 33 individuals diagnosed with CdLS, aged between 4 and 21 years, was assessed using the Kidslife questionnaire. Specifically, the influence of 14 risk factors on overall QoL and 8 of its domains was analyzed. The study revealed below-median QoL (45.3 percentile), with the most affected domains being physical well-being, personal development, and self-determination. When classifying patients based on their QoL and affected domains, variants in the NIPBL gene, clinical scores ≥11, and severe behavioral and communication issues were found to be the main risk factors. We emphasize the need for a comprehensive approach to CdLS that encompasses clinical, molecular, psychosocial, and emotional aspects. The "Kidslife questionnaire" proved to be a useful tool for evaluating QoL, risk factors, and the effectiveness of implemented strategies. In this study, we underscore the importance of implementing corrective measures to improve the clinical score. Furthermore, we highlight the necessity of applying specific therapies for behavioral problems after ruling out underlying causes such as pain or gastroesophageal reflux and implementing measures that facilitate communication and promote social interaction.

Cornelia De Lange Syndrome with left heart hypoplasia: a case study

Cornelia de Lange syndrome (CdLS) is characterized by slow growth that can lead to short stature. Despite mutations in the NIPBL, RAD21 or SMC3 genes, CdLS is thought to be inherited in an autosomal dominant manner. Findings include intellectual disability and bone abnormalities in the upper extremities and distinct facial features. It has similar characteristics to autism spectrum disorder, which is a developmental condition that affects communication and social interaction. The physical and clinical findings of a one-and-a-half-year-old girl patient diagnosed with CdLS were reported. In addition to NIPBL gene mutation, atrioventricular septal defect (AVSD), an overriding aorta, and a hypoplastic left heart (HLH) were observed in our case. This study revealed the patient's physical and clinical findings consistent with the diagnosis of CdLS. Additionally emphasized HLH. The importance of performing corrective surgery immediately following the evaluation of congenital heart diseases in CdLS patients can be emphasized.

Gastrulation-stage gene expression in Nipbl+/- mouse embryos foreshadows the development of syndromic birth defects.

In animal models, Nipbl deficiency phenocopies gene expression changes and birth defects seen in Cornelia de Lange syndrome, the most common cause of which is Nipbl haploinsufficiency. Previous studies in Nipbl+/- mice suggested that heart development is abnormal as soon as cardiogenic tissue is formed. To investigate this, we performed single-cell RNA sequencing on wild-type and Nipbl+/- mouse embryos at gastrulation and early cardiac crescent stages. Nipbl+/- embryos had fewer mesoderm cells than wild-type and altered proportions of mesodermal cell subpopulations. These findings were associated with underexpression of genes implicated in driving specific mesodermal lineages. In addition, Nanog was found to be overexpressed in all germ layers, and many gene expression changes observed in Nipbl+/- embryos could be attributed to Nanog overexpression. These findings establish a link between Nipbl deficiency, Nanog overexpression, and gene expression dysregulation/lineage misallocation, which ultimately manifest as birth defects in Nipbl+/- animals and Cornelia de Lange syndrome.

Long-read sequencing reveals chromothripsis in a molecularly unsolved case of Cornelia de Lange syndrome.

Thanks to a long-read sequencing (LRS) approach, in this study, we have reported a molecularly solved case of a proband with a clinical diagnosis of Cornelia de Lange syndrome (CDLS), which is a multisystemic disorder whose causative molecular defects involve cohesin complex genes, with NIPBL located at 5p13.2 accounting for approximately 50%-60% of CDLS cases. The first-tier tests revealed an abnormal karyotype 46,XY,t(5;15)(p13;q25)dn and a preserved NIPBL sequencing. Copy number variants (CNVs) at the translocation breakpoints, in disease genes, or in probably pathogenic loci were excluded by a-CGH analysis. Through fluorescence in situ hybridization (FISH) analysis on derivative chromosome 5, the breakpoint was relocated 3 Mb far from NIPBL 5'UTR, which seemed fully maintained as FISH-probe mapping to the gene showed no split signals. Moreover, tri-color FISH revealed an apparently balanced paracentric inversion including NIPBL on derivative 5. Based on the strong clinical suspicion, we evaluated the NIPBL transcript by RT-qPCR that revealed a normal amount of transcript till exon 22 and a halved amount of the transcript from exon 23 to 3'UTR, indicating the expression of a truncated transcript probably leading to a defective protein. Despite RT-qPCR confirmed the patient's CDLS clinical diagnosis, the molecular mechanism underlying this event remained to be an unsolved challenge for years. The LRS approach with nanopore technologies was able to fill the gap in this complex scenario and highlighted a chromothripsis event marked out at 5p13.2 by 36 breaks clustered in a 7.3-Mb region. The NIPBL gene was disrupted by 16 breaks and the resulting fragments were relocated in different positions and orientations. LRS confirmed the previous findings, and it has been proven to be crucial to define the complex chromosomal rearrangement in this patient which escaped current diagnostic investigations. Its application in the clinical practice will contribute to solve the unsolved.

Neurobehavioral and developmental profiles: genotype–phenotype correlations in individuals with Cornelia de Lange syndrome

BackgroundCornelia de Lange (CdLS) is a rare genetic disorder that affects most body systems. Variants in multiple genes including NIPBL and SMC1A, can cause the syndrome. To date, literature on genotype–phenotype associations in individuals with CdLS is extremely limited, although studies suggest some differences in clinical phenotype severity across variants. This study aimed to examine and compare neurobehavioral differences and developmental variability across CdLS genes, specifically NIPBL and SMC1A, and identify genotype–phenotype correlations.Participants and methodsThis patient-reported outcomes study included accessing data from the Coordination of Rare Diseases registry at Sanford. Parents of a total of 26 children/adults with CdLS and a known variant in NIPBL (Mean age = 20.46 years, SD = 11.21) and 12 with a known variant in SMC1A (Mean age = 11.08 years, SD = 9.04) completed a series of questionnaires regarding their child’s developmental history. This included attainment of common language and motor milestones, intervention history, and behavior functioning. Developmental history and reported behavior regulation difficulties were compared across variant groups.ResultsOverall, individuals with a pathogenic variant in NIPBL or SMC1A were similarly delayed across motor and language milestones with about 70% not using phrase speech and 30–50% not walking by 5 years of age. However, those with NIPBL variants showed more severity in behavioral phenotype, namely with more repetitive behaviors, tantrums, and withdrawn behaviors. In addition, these individuals were more likely than those with SMC1A variants to demonstrate self-injurious behaviors, and anxiety. Both groups yielded a similar proportion of participants who participated in speech and occupational therapy, however those with SMC1A variants were more likely to engage in physical therapy. Both clinical groups report low rate of communicative or assistive device use despite a large proportion of participants never mastering single word or sentence use.ConclusionsStudy results are consistent with recent investigations highlighting more severe behavioral phenotype, particularly autistic features, anxiety, and behavior regulation challenges, among those with NIPBL variants albeit comparable developmental milestones. Both groups endorsed very elevated attention problems. Findings highlight importance of early interventions, including behavioral health services.

Visual attention patterns during a gaze following task in neurogenetic syndromes associated with unique profiles of autistic traits: Fragile X and Cornelia de Lange syndromes

BackgroundGaze following difficulties are considered an early marker of autism, thought likely to cumulatively impact the development of social cognition, language and social skills. Subtle differences in gaze following abilities may contribute to the diverse range social and communicative autistic characteristics observed across people with genetic syndromes, such as Cornelia de Lange (CdLS) and fragile X (FXS) syndromes. AimsTo compare profiles of 1) visual attention to the eye region at critical points of the attention direction process, 2) whether children follow the gaze cue to the object, and 3) participant looking time to the target object following the gaze cue between groups and conditions. Materials and methodsChildren with CdLS (N = 11) and FXS (N = 8) and autistic (N = 22) and neurotypical (N = 15) children took part in a passive viewing paradigm adapted from Senju and Csibra (2008), in which videos of a central cue (ball/cartoon face/human face) directed attention towards one of two objects. Visual attention patterns were recorded via eye tracking technology. ResultsNeurotypical children were used as a reference group against which the autistic, CdLS and FXS groups were compared. Although autistic children looked at the eye region for significantly less time, they looked at the target object as frequently and for a similar duration as neurotypical children. Children with FXS looked at the target as frequently as neurotypical children but looked at it for comparatively less time. Both neurotypical children and children with CdLS frequently looked at the eye region, but children with CdLS were less likely to look at the target than neurotypical children. ConclusionsFindings provide preliminary evidence of unique patterns of visual attention and gaze following strategies in children with CdLS, children with FXS and autistic children. These unique gaze following patterns may underpin the distinct profiles of social and communication autistic traits observed between these groups.

SMC1A epilepsy syndrome: clinical data from a large international cohort.

SMC1A epilepsy syndrome or developmental and epileptic encephalopathy-85 with or without midline brain defects (DEE85, OMIM #301044) is an X-linked neurologic disorder associated with mutations of the SMC1A gene, which is also responsible for about 5% of patients affected by Cornelia de Lange syndrome spectrum (CdLS). Only described in female patients, SMC1A epilepsy syndrome is characterized by the onset of severe refractory epileptic seizures in the first year of life, global developmental delay, a variable degree of intellectual disability, and dysmorphic facial features not typical of CdLS. This was a descriptive observational study for the largest international cohort with this specific disorder. The main goal of this study was to improve the knowledge of the natural history of this phenotype with particular attention to the psychomotor development and the epilepsy data. The analyzed cohort shows normal prenatal growth with the subsequent development of postnatal microcephaly. The incidence of neonatal problems (seizures and respiratory compromise) is considerable (51.4%). There is a significant prevalence of central nervous system (20%) and cardiovascular malformations (20%). Motor skills are generally delayed. The presence of drug-resistant epilepsy is confirmed; the therapeutic role of a ketogenic diet is still uncertain. The significant regression of previously acquired skills following the onset of seizures has been observed. Facial dysmorphisms are variable and no patient shows a classic CdLS phenotype. To sum up, SMC1A variants caused drug-resistant epilepsy in these patients, more than two-thirds of whom were shown to progress to developmental and epileptic encephalopathy. The SMC1A gene variants are all different from each other (apart from a couple of monozygotic twins), demonstrating the absence of a mutational hotspot in the SMC1A gene. Owing to the absence of phenotypic specificity, whole-exome sequencing is currently the diagnostic gold standard.

Scoping review of Physiotherapy intervention for a rare disease Cornelia de Lange Syndrome (CdLS)/ Brachman de Lange syndrome in children

Introduction: Cornelia de Lange syndrome (CdLS) is a rare genetic disease. Children with CdLS typically require physical therapy, however evidence on the efficacy of Physiotherapy intervention in this population is limited.
 Objective: The aim of this review is to design Physiotherapy treatment protocol for the CdLS population.
 Study Eligibility Criteria: ‏Articles published only in English between July, 2006 and February, 2022 were included which investigated the role of Physiotherapy to CDLS patients.
 Method: We use six databases which includes, MEDLINE/PubMed, SCOPUS, PEDro, CINAHL, EBSCO and Cochrane were searched with predefined keywords specific to or related to PT interventions from 2006 to February, 2022 for the full-text English language articles.
 Results: from the 12 articles identified, 6 papers were involved in the review which was deemed as being of high quality.
 Conclusion: Physiotherapy treatments are playing an important role in improving fine and gross motor function and participation during daily activities in a child with CdLS.
 Recommendations: To evaluate the efficacy of Physiotherapy treatments in children with CdLS, bigger group studies are needed.

Ophthalmologic findings in Cornelia de Lange syndrome

Introduction : Cornelia de Lange syndrome (CdLS) is a rare disease characterized by multisystem abnormalities, including various ophthalmologic problems. The purpose is to report this kind of rare case and highlight the role of ophthalmologist in visual development optimalization.
 Case Illustration : A 2-year-old boy with CdLS showing bilateral microcornea, cataracts with “dot opacities,” and chin lifts induced by ptosis. We also examined brow hypertrichosis, synophrys, and long arcuate eyelashes. High myopia and high astigmatism was found in the patient with spherical equivalent of 9.8 D. He was born with low birth weight, microcephaly, anteverted nostrils, depressed nasal bridge, thin upper lip, micrognathia, low posterior hairline, short neck, and syndactili. He also showed psychological lag and developmental impairment. Glasses was then prescribed to prevent amblyopia.
 Discussion : Individuals with CdLS may have multiple treatable ocular conditions. We recommend that patients have an initial ophthalmic examination after diagnosis of CdLS is first made, in order to establish a baseline and to assess for the presence of abnormalities that would benefit from early intervention. Examination under anesthesia may be required in some patients to adequately assess for any abnormalities, and to obtain a good refraction as well as an inspection of the retinal periphery in children with long axial length. Early intervention may greatly improve function and prevent vision loss due to amblyopia.
 Conclusion : Initial ophthalmic examination followed by routine annual screening is warranted when a diagnosis of CdLS is made, given that ocular anomalies are present in the majority of patients and may impact vision and daily functioning.

Genetic analysis of a fetus with Cornelia de Lange syndrome due to variant of SMC3 gene

To explore the genetic basis for a fetus featuring oligodactyly. A fetus with hand deformity identified by ultrasound at the Maternal and Child Health Care Hospital of Hubei Province on October 20, 2018 was selected as the study subject. Clinical information and ultrasonographic finding of the pregnant woman were collected. Following elected abortion, umbilical cord and peripheral venous blood samples of the couple were collected for the extraction of genomic DNA. Copy number variation sequencing (CNV-seq) and trio-whole exome sequencing (trio-WES) were carried out. Candidate variants were verified by Sanger sequencing. Ultrasonographic examination at 30+2 weeks of gestation revealed that the fetus had small right hand with absence of 2nd-5th fingers, whilst its left hand had appeared to be normal. By CNV-seq, no pathogenic or likely pathogenic copy number variation (CNV) (≥ 100 Kb) was detected in the fetus. Trio-WES revealed that the fetus had harbored a novel heterozygous c.3298G>A (p.Val1100Met) variant of the SMC3 gene. The variant has not been recorded in the population databases, and was predicted to be deleterious by several bioinformatic software and evolutionarily conserved based on multiple sequence alignment analysis. Sanger sequencing showed that neither parent has carried the same variant. Based on the guidelines from the American College of Medical Genetics and Genomics (ACMG), the variant was predicted to be likely pathogenic (PS2+PM2_Supporting+PP3). The fetus was diagnosed with Cornelia de Lange syndrome, for which the novel heterozygous c.3298G>A variant of the SMC3 gene may be accountable.

Sleep abnormalities in De Lange syndrome

Sleep abnormalities in De Lange syndrome

A Rare Case of Cornelia De Lange Syndrome

An 8-year-old female child was referred to our Cleft and Craniofacial centre, Department of Plastic & Reconstructive Surgery, Saveetha Medical College & Hospital, after being diagnosed with cleft palate and hyper nasal speech. She is the first child born from a non- consanguineous marriage with a birth weight of 2.6 kg. Following her, a girl and a boy were born and exhibited no apparent abnormalities. Both parents maintain a normal status, and there is no history of deformities in their family lineage. The patient underwent a typical vaginal delivery and was born at full term. At the time of birth, the child was differentially diagnosed with a neurogenic tumour in the occipital region of the skull. The child was not treated for the growth in the occiput. Patient had growth retardation, global developmental delays and features of facial dysmorphism like microcephaly, bushy and uni eyebrow, long eyelashes, low set ears, small nose, concave nasal bridge, and hirsutism. The child was subjected to an MRI brain scan in our unit and it suggested a hyperechoic lesion in the midline at C3, C4 level with an impression of Arnold Chiari malformation. Clinically, on palpation of the lesion, it approximately measured 4x3 cm, soft in consistency and the lesion hardened while coughing or sneezing and regressed back to normalcy within a few minutes. USG abdomen was done and a well-defined hypoechoic dumbbell shaped bilobed solid lesion with smooth margins with no significant vascularity was noted in the gastrohepatic region. Echocardiogram was done and it ruled out cardiac anomalies like patent ductus arteriosus or coarctation of aorta. Inspection of the oral cavity was done to diagnose the cleft of the secondary palate. (Fig. 1) Based on all features in examination and investigation, a diagnosis of Cornelia de Lange syndrome was made. The surgery was planned after a routine blood workup. The child was advised for CECT of abdomen to confirm the USG findings of abdominal anomalies, however, the report suggested cystic lymphangioma. (Fig. 2) Fitness for palatoplasty surgery was obtained from paediatrician, paediatric surgeon, neurosurgeon, cardiologist and anaesthesiologist. Under antibiotic cover, the child was operated under general anaesthesia for palatoplasty by Sommerlad’s technique. (Fig. 3 & 4) The post-operative period was uneventful.

Heterozygous loss-of-function SMC3 variants are associated with variable growth and developmental features

Heterozygous missense variants and in-frame indels in SMC3 are a cause of Cornelia de Lange syndrome (CdLS), marked by intellectual disability, growth deficiency, and dysmorphism, via an apparent dominant-negative mechanism. However, the spectrum of manifestations associated with SMC3 loss-of-function variants has not been reported, leading to hypotheses of alternative phenotypes or even developmental lethality. We used matchmaking servers, patient registries, and other resources to identify individuals with heterozygous, predicted loss-of-function (pLoF) variants in SMC3, and analyzed population databases to characterize mutational intolerance in this gene. Here, we show that SMC3 behaves as an archetypal haploinsufficient gene: it is highly constrained against pLoF variants, strongly depleted for missense variants, and pLoF variants are associated with a range of developmental phenotypes. Among 14 individuals with SMC3 pLoF variants, phenotypes were variable but coalesced on low growth parameters, developmental delay/intellectual disability, and dysmorphism, reminiscent of atypical CdLS. Comparisons to individuals with SMC3 missense/in-frame indel variants demonstrated an overall milder presentation in pLoF carriers. Furthermore, several individuals harboring pLoF variants in SMC3 were nonpenetrant for growth, developmental, and/or dysmorphic features, and some had alternative symptomatologies with rational biological links to SMC3. Analyses of tumor and model system transcriptomic data and epigenetic data in a subset of cases suggest that SMC3 pLoF variants reduce SMC3 expression but do not strongly support clustering with functional genomic signatures of typical CdLS. Our finding of substantial population-scale LoF intolerance in concert with variable growth and developmental features in subjects with SMC3 pLoF variants expands the scope of cohesinopathies, informs on their allelic architecture, and suggests the existence of additional clearly LoF-constrained genes whose disease links will be confirmed only by multi-layered genomic data paired with careful phenotyping.

STAG2: Computational Analysis of Missense Variants Involved in Disease.

The human STAG2 protein is an essential component of the cohesin complex involved in cellular processes of gene expression, DNA repair, and genomic integrity. Somatic mutations in the STAG2 sequence have been associated with various types of cancer, while congenital variants have been linked to developmental disorders such as Mullegama-Klein-Martinez syndrome, X-linked holoprosencephaly-13, and Cornelia de Lange syndrome. In the cohesin complex, the direct interaction of STAG2 with DNA and with NIPBL, RAD21, and CTCF proteins has been described. The function of STAG2 within the complex is still unknown, but it is related to its DNA binding capacity and is modulated by its binding to the other three proteins. Every missense variant described for STAG2 is located in regions involved in one of these interactions. In the present work, we model the structure of 12 missense variants described for STAG2, as well as two other variants of NIPBl and two of RAD21 located at STAG2 interaction zone, and then analyze their behavior through molecular dynamic simulations, comparing them with the same simulation of the wild-type protein. This will allow the effects of variants to be rationalized at the atomic level and provide clues as to how STAG2 functions in the cohesin complex.

BRD4 binds to active cranial neural crest enhancers to regulate RUNX2 activity during osteoblast differentiation.

Cornelia de Lange syndrome (CdLS) is a congenital disorder featuring facial dysmorphism, postnatal growth deficits, cognitive disability and upper limb abnormalities. CdLS is genetically heterogeneous, with cases arising from mutation of BRD4, a bromodomain protein that binds and reads acetylated histones. In this study, we have modeled CdLS facial pathology through mouse neural crest cell (NCC)-specific mutation of BRD4 to characterize cellular and molecular function in craniofacial development. Mice with BRD4 NCC loss of function died at birth with severe facial hypoplasia, cleft palate, mid-facial clefting and exencephaly. Following migration, BRD4 mutant NCCs initiated RUNX2 expression for differentiation to osteoblast lineages but failed to induce downstream RUNX2 targets required for lineage commitment. BRD4 bound to active enhancers to regulate expression of osteogenic transcription factors and extracellular matrix components integral for bone formation. RUNX2 physically interacts with a C-terminal domain in the long isoform of BRD4 and can co-occupy osteogenic enhancers. This BRD4 association is required for RUNX2 recruitment and appropriate osteoblast differentiation. We conclude that BRD4 controls facial bone development through osteoblast enhancer regulation of the RUNX2 transcriptional program.

Chromatinopathies: insight in clinical aspects and underlying epigenetic changes.

Chromatinopathies (CPs), a group of rare inborn defects characterized by chromatin state imbalance, have evolved from initially resembling Cornelia de Lange syndrome to encompass a wide array of genetic diseases with diverse clinical presentations. The CPs classification now includes human developmental disorders caused by germline mutations in epigenes, genes that regulate the epigenome. Recent advances in next-generation sequencing have enabled the association of 154 epigenes with CPs, revealing distinctive DNA methylation patterns known as episignatures.It has been shown that episignatures are unique for a particular CP or share similarities among specific CP subgroup. Consequently, these episignatures have emerged as promising biomarkers for diagnosing and treating CPs, differentiating subtypes, evaluating variants of unknown significance, and facilitating targeted therapies tailored to the underlying epigenetic dysregulation.The following review was conducted to collect, summarize, and analyze data regarding CPs in such aspects as clinical evaluation encompassing long-term patient care, underlying epigenetic changes, and innovative molecular and bioinformatic methodologies that have been devised for the assessment of CPs. We have also shed light on promising novel treatment options that have surfaced in recent research and presented a synthesis of ongoing clinical trials, contributing to the current understanding of the dynamic and evolving nature of CPs investigation.

Mutation profiling in South African patients with Cornelia de Lange syndrome phenotype.

Cornelia de Lange Syndrome (CdLS) presents with a variable multi-systemic phenotype and pathogenic variants have been identified in five main genes. This condition has been understudied in African populations with little phenotypic and molecular information available. We present a cohort of 14 patients with clinical features suggestive of CdLS. Clinical phenotyping was carried out and cases were classified according to the international consensus criteria. According to this criteria, nine patients had classical CdLS, one had non-classical CdLS and four presented with a phenotype that suggested molecular testing for CdLS. Each patient underwent mutation profiling using a targeted next generation sequencing panel of 18 genes comprising known and suspected CdLS causal genes. Of the 14 patients tested, pathogenic and likely pathogenic variants were identified in nine: eight variants in the NIPBL gene and one in the STAG1 gene. We present the first molecular data for a cohort of South African patients with CdLS. Eight of the nine variants identified were in the NIPBL gene, the most commonly involved gene in cases of CdLS. This is also the first report of a patient of African ancestry presenting with STAG1-related CdLS.

A Cornelia De Lange Syndrome Patient with Cleft Palate: A Case Report with Intraoral and Extraoral Findings

Objective: This case report presents the clinical and genetic findings in a one-week-old male patient with Cornelia de Lange Syndrome (CdLS) and unilateral cleft palate with a review of literature which includes case reports with cleft lip and palate. 
 Case Presentation: The patient exhibited characteristic facial dysmorphism, including a low-set hairline, long and bushy unibrow, inclined nose with anteverted nostrils, long philtrum, thin lips, and micrognathia. Upper limb malformations, genitourinary anomalies, and hirsutism were also present. The patient underwent comprehensive follow-up for five months, during which an alginate impression was taken to aid intraoral feeding, and a plaster model was prepared for the construction of an obturator, an essential component of the cleft palate management plan. The treatment plan involved multidisciplinary collaboration, including pre-surgical orthodontic preparation, evaluation of dental anomalies, surgical intervention with an oral and maxillofacial surgeon, post-operative care, and monitoring. Post-surgical orthodontic treatment and speech therapy were planned for later stages, followed by fine-tuning and a retention plan for long-term stability.
 Conclusion: CdLS is a complex genetic disorder characterized by various physical abnormalities. This case report demonstrated the management of a one-week-old male patient with CdLS and unilateral cleft palate through a comprehensive multidisciplinary approach. Early intervention, personalized treatment plans, and long-term follow-up are crucial for addressing dental and maxillofacial complications associated with cleft palate in CdLS patients. Collaborative efforts among specialists yield optimal outcomes, improving the quality of life for individuals with CdLS and cleft palate.
 Keywords: cornelia de lange, cleft palate, cleft lip