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CANDLE SYNDROME: Orofacial manifestations and dental implications
© Roberts et al. 2016
- Received: 9 February 2015
- Accepted: 17 December 2015
- Published: 28 December 2015
A South African girl with CANDLE Syndrome is reported with emphasis on the orodental features and dental management. Clinical manifestations included short stature, wasting of the soft tissue of the arms and legs, erythematous skin eruptions and a prominent abdomen due to hepatosplenomegaly. Generalized microdontia, confirmed by tooth measurement and osteopenia of her jaws, confirmed by digitalized radiography, were previously undescribed syndromic components. Intellectual impairment posed problems during dental intervention. The carious dental lesions and poor oral hygiene were treated conservatively under local anaesthetic. Prophylactic antibiotics were administered an hour before all procedures.
Due to the nature of her general condition, invasive dental procedures were minimal. Regular follow-ups were scheduled at six monthly intervals. During this period, her overall oral health status had improved markedly.
The CANDLE syndrome is a rare condition with grave complications including immunosuppression and diabetes mellitus. As with many genetic disorders, the dental manifestations are often overshadowed by other more conspicuous and complex syndromic features. Recognition of both the clinical and oral changes that occur in the CANDLE syndrome facilitates accurate diagnosis and appropriate dental management of this potentially lethal condition.
- Bone Mineral Density
- Tooth Size
- Microcytic Anemia
- Dental Management
- PSMB8 Gene
The CANDLE syndrome [MIM256040] is a rare autosomal recessive disorder in which autoinflammatory processes lead to multisystem complications. The acronym “CANDLE” pertains to Chronic Atypical Neutrophilic Dermatosis with Lipodystrophy and Elevated temperature. Other variable features include intellectual disability and short stature. Published reports are scanty and apart from macroglossia  no other oro-dental features have been mentioned in the literature.
The CANDLE syndrome, which is classified as a proteasome-associated autoinflammatory syndrome (PRAAS), and known as the Nakajo-Nishimura syndrome (NKJO) was delineated in 1939 by Nakajo, a medical staff member at Tohoku University in Japan. The initial syndromic features included erythematous skin lesions, clubbed fingers, periosteal thickening and cardiac insufficiency . Thereafter, Nishimura et al.  expanded the phenotype to include hypertrophic pulmonary osteoarthropathy. Additional phenotypic features which have been reported included prominent eyes, enlarged nose and lips; elongated, broad fingers; gross wasting of the arms and legs, severe joint pains and fever that were alleviated by the use of steroids; muscle atrophy and weakness; mild mental retardation; hepatomegaly; macroglossia; short stature and calcifications of the basal ganglia are other documented syndromic manfestations [1, 4–6].
Garg et al.,  described a syndrome with similar features to NKJO and coined the term “Joint contractures, Muscular Atrophy, Microcytic anemia, and Panniculitis-induced Lipodystrophy (JMP) syndrome”. The main difference between the NKJO and JMP syndromes is the absence of fever in JMP syndrome and the absence of seizures in NKJO . Toretello et al.  subsequently proposed the acronym “CANDLE” and drew attention to the fact that affected persons were homozygous for an autosomal recessive gene. In a further significant development, Wang et al. 2014  suggested that the CANDLE syndrome, NakajoNishimura syndrome and JMP syndrome may be clinical variants of the same genetic disorder reflecting intragenic heterogeneity in the determinant PSMB8 gene mutations.
In this article, we have documented and reviewed the clinical manifestations in an affected girl with emphasis oro-facial features and dental implications. In this context previously undescribed abnormalities include microdontia, microstomia and diastemata have been documented. These observations will be of practical significance in dentistry.
A South African girl born in 2001 was seen in 2013 at the age of 12 years at the St Joseph’s home for disabled children, Cape Town. She was referred to Tygerberg Dental Hospital for routine dental management.
At the age of 12 years she had short stature, with broad, thick fingers, wasting of the soft tissue of her arms and legs and an enlarged abdomen due to hepatosplenomegaly. Her facial features were coarse. Diffuse erythematous skin plaques were evident on her arms and limbs. There was no previous history of dental problems but marked oedema was noted around the perioral and nasal area. The mandibular symphyses were prominent and microstomia was present. There was no evidence of jaundice, anemia, cyanosis or clubbing. Cervical lymph nodes were palpable on the right side of the neck.
Numerous investigations for autoimmune and infectious diseases had been undertaken. These included Anti-Nuclear antibodies ANA (3 consecutive tests), anti-DNA antibodies and other auto-antibodies. She had a normal white blood cell count, mild microcytic anemia, and mild elevation of platelet levels. These investigations all yielded negative results. Inflammatory markers and serum triglycerides were elevated. At times of flare, transient elevation of muscle enzymes CK, AST and ALT had occurred. Her uric acid levels were normal. She had been investigated several times for HIV with negative results, given that these infections are highly prevalent in South Africa. Investigations for infectious disorders included tests for bacterial, viral, parasitic, and fungal infections; all were negative. The syphilis RPR test was non-reactive. Urine studies yielded normal results. Abdominal ultrasonic studies confirmed the presence of hepatosplenomegaly. A CT scan of her brain was undertaken shortly after a seizure, revealing calcifications of her basal ganglia, but no other signs of a mass lesion or inflammation. Histopathological investigations of multiple tissues showed diffuse neutrophilic infiltrates at multiple sites including muscle, liver and skin.
She had significantly increased levels of Interferon gamma (IFN-y).
The Klemmeti Index measures the morphology of the mandibular cortex and is conventionally categorized as C1 (normal), C2 (osteopenic), or C3 (osteoporotic).
Bone mineral density measurements of the girl with Candle syndrome compared with two unaffected females of same age, ethnicity and gender
Mandibular cortical width
0.66 mm (mean)
2.08 mm (mean)
2.81 mm (mean)
Panoramic mandibular Index
Tooth size analysis
Alginate impressions of both the maxillary and mandibular arches were made and the impressions were immediately poured into a laboratory dental stone. All measurements were taken directly from the unsoaped plaster study models. The teeth measured included the maxillary and mandibular permanent central and lateral incisors, the maxillary and mandibular permanent canines, first and second premolars and the maxillary first molars.
A sliding manual caliper was used to measure the mesiodistal tooth width according to the guidelines defined by Hunter and Priest .
Comparison of normal tooth size in black South African females with patient’s tooth size
The carious lesions and poor oral hygiene were treated conservatively under local anaesthetic. Prophylactic antibiotics were administered an hour before all interventions and due to the nature of her general condition, invasive procedures were .avoided where possible. Regular follow-ups were scheduled at six monthly intervals. During this period, her overall oral health status had improved markedly.
Written informed consent was obtained from the patient’s legal guardian for publication of this case report and any accompanying special investigations and images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
Our approach to the documentation and discussion of the orofacial and dental manifestations of the CANDLE syndrome was constrained by the rarity of the disorder as only approximately 30 cases have been reported in the literature. The strength of our approach is the combination of expertise of the authors, involving different scientific, dental and clinical disciplines.
The CANDLE syndrome is caused by homozygosity for mutations in the Proteasome (Prosome, Macropain) Subunit, Beta Type, 8 (PSMB8) gene that encodes for proteasomes that are responsible for the physiological degradation of proteins. Mutations of PSMB8 result in an accumulation of modified and oxidated proteins in cells and tissues, leading to an increase of cellular stress and increased apotosis occurring in muscle and fat [1, 15–17]. Recent developments indicate that not all individuals affected by the CANDLE syndrome have PSMB8 mutations . Brehm et al. 2015 identified 8 mutations in 4 proteasome genes, PSMA3, PSMB4, PSMB9, and proteasome maturation protein (POMP), that have not previously been related to the disease. These mutations affect transcription, protein expression, protein folding, proteasome assembly, and, eventually, proteasome activity .
Microdontia in genetic syndromes
Microcephalic osteodysplastic primordial dwarfism
True generalized microdontia in which all the teeth are smaller than normal is rare.
Relative generalized microdontia occurs when teeth are normal in size, but appear to be smaller than normal. For example, if the jaws are large and teeth are normal.
Microdontia involving a single tooth.
The genetic basis of microdontia
Over 300 genes are implicated in tooth development . Many of these genes regulate ectodermal-mesenchymal interactions in a programmed sequence. In turn, these processes control the shape, number and sizes of teeth. Similar ectodermal-mesenchymal interactions occur throughout the developing fetus and in many instances, involve the same genes. For these reasons, the occurrence of dental anomalies in genetic syndromes could be an indicator of common developmental factors in both dental and other tissues .
The relationship between growth and tooth size indicates that repeated ectodermal– mesenchymal interactions occur during the initiation and morphogenesis phases of tooth development. Although epigenetic influences affect the position of tooth forming tissue within the jaw, scheduling of the communicating signals explains differences in tooth size. In this context, no particular gene has been implicated as the primary cause of microdontia.
Although a decrease in bone density is commonly associated with the long-term use of corticosteroids, there is no documented evidence to suggest that steroids influence odontogenesis.
Microstomia refers to a decrease in the size of the opening of the mouth. Although there are no standardized criteria to measure the extent of mouth opening, microstomia affects both function and aesthetics . Microstomia can result in to difficulty in swallowing, speech impairment, deficient oral hygiene and dental caries. In the affected girl, small dimensions of the oral orifice compromised dental management scaling and polishing.
The term refers to increased spacing between teeth and is often caused by loss of interproximal contact between teeth. The most common site of diastemata is in the anterior maxilla between the cuspid teeth . Generalized increase in interdental spacing occurs when there is a disproportionate relationship between the size of the teeth and that of the jaw . Interproximal tooth wear may be a contributing factor. The generalized spacing of the affected girl’s teeth was probably the result of the microdontia.
Hypoplastic air sinuses
Hypoplasia of the cranial sinuses was evident on CBCT investigation of the affected girl. Sinuses serve several functions: they decrease the weight of the anterior aspect of the skull, increase the resonance of the voice, have a protective role by dampening pressure (e.g. due to trauma to the face), increase the rigidity of the facial bones and serve to protect structures such as the eyes. They also filter and humidify the air during respiration .
The results of the both densometric and linear measurements suggest that osteopenia was present in the affected girl. It is uncertain however, whether the osteopenia resulted from the long-term use of systemic corticosteroid or whether it is a previously unreported syndromic component. Periodontal disease, decreased alveolar bone density and edentulism are frequent in persons affected by osteoporosis. Fractures of the jaw can result in impaired function, affecting the individual’s quality of life.
Dental management considerations in the CANDLE syndrome
The presence of severe immunosuppression that was compounded by diabetes mellitus in the affected girl was a matter of concern. In these circumstances, a multi-disciplinary approach was necessary for the provision of dental management. Factors that warranted consideration when planning her dental treatment included diet, blood glucose levels, reduced leukocyte function Decreased integrity of the blood vessels, which is a common complication of diabetes mellitus was also relevant. In addition, immunosuppressive drugs could result in bone marrow suppression and decrease the production of platelets and leukocytes as well as induce osteopenic changes that could predispose to jaw fractures. Together, these factors increase the risk of developing infection, delayed wound healing and prolonged bleeding times. In these circumstances, the dental management of the affected girl was by conventional procedures with an increased awareness of the risks of possible complications.
The CANDLE syndrome is a rare condition with grave complications including immunosuppression and diabetes mellitus. As with many genetic disorders, the dental manifestations are often overshadowed by other more conspicuous and complex syndromic features. Recognition of both the clinical and oral changes that occur in the CANDLE syndrome facilitates accurate diagnosis and appropriate management of this potentially lethal condition.
All investigations were undertaken with full ethical approval in accordance with the Declaration of Helsinki as updated in the version promulgated in June 2013 and the Singapore Statement on Research Integrity. Ethics approval was received from the University of Cape Town Faculty of Health Sciences Institutional Ethics Committee (no. 203/2013).
The authors wish to acknowledge the following:
Dr M Kumar, University of the Western Cape, for the analysis of the digital radiographs Financial support was available from the National Research Foundation and the Medical Research Council of South Africa via grants received by Prof Beighton (MRC: 415882 and NRF: 443503).
The content of this article is the sole work of the authors. No benefits of any form have been or are to be received from a commercial party related directly or indirectly to the subject of this article.
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