Dyggve-Melchior-Clausen syndrome: novel splice mutation with atlanto-axial subluxation.
PMID 20865280 | DOI 10.1007/s00431-010-1298-0 · European journal of pediatrics · 2011 · View on PubMed ↗
Dyggve-Melchior-Clausen (DMC) syndrome is a rare autosomal recessive disorder characterized by the association of a progressive spondyloepimetaphyseal dysplasia and mental retardation ranging from mild to severe. The disorder results from mutations in the dymeclin (DYM) gene in the 18q12-12.1 chromosomal region. We report two siblings with classical clinical and radiological features of DMC and asymptomatic atlanto-axial dislocation. A novel homozygous splice-site mutation (IVS15+3G>T) was detected. Reverse transcriptase polymerase chain reaction (RT-PCR) confirmed that this mutation affects normal splicing. To the best of our knowledge, this is the first report of DMC from Saudi Arabia. The splice mutation noted in our patients was compared to the previously reported cases and supports the hypothesis that loss of DYM function is the likely mechanism of disease pathogenesis. In conclusion, distinction between this type of skeletal dysplasia and Morquio disease (MPS IV) is important for paediatricians and clinical geneticist in providing standard patient care and genetic counselling.
Validated evidence
| Type | Entity | Source evidence | Confidence | Extractor |
|---|---|---|---|---|
| gene | DYM | “The disorder results from mutations in the dymeclin (DYM) gene in the 18q12-12.1 chromosomal region.” | 0.98 | hgnc_dict_v1 |
| phenotype | skeletal dysplasia | “In conclusion, distinction between this type of skeletal dysplasia and Morquio disease (MPS IV) is important for paediatricians and clinical geneticist in providing standard patient care and genetic counselling.” | 0.98 | phenotype_alias_lexicon_v2 |
| phenotype | intellectual disability | “Dyggve-Melchior-Clausen (DMC) syndrome is a rare autosomal recessive disorder characterized by the association of a progressive spondyloepimetaphyseal dysplasia and mental retardation ranging from mild to severe.” | 0.93 | phenotype_alias_lexicon_v2 |
| population | Saudi Arabia | “To the best of our knowledge, this is the first report of DMC from Saudi Arabia.” | 0.95 | saudi_context_rules_v1 |
| variant | IVS15+3G>T | “A novel homozygous splice-site mutation (IVS15+3G>T) was detected.” | 0.82 | literature_variant_regex_v2 |
| variant | IVS15+3G>T | “A novel homozygous splice-site mutation (IVS15+3G>T) was detected.” | 0.82 | literature_variant_regex_v2 |