title: Abnormal myelination in ring chromosome 18 syndrome.
abstract: Partial deletion of genetic material from the long arm of chromosome 18 results in a syndrome with multisystemic involvement, including dysmorphic features, intellectual disability, cardiac malformations, endocrine abnormalities, immunodeficiency, musculoskeletal deformities, and variable neurologic manifestations. Hypomyelination has been reported in patients with chromosome 18q- and postulated to be secondary to deletion of the gene coding for myelin basic protein found at 18q23. Little however is reported on cerebral anomalies seen in patients with ring chromosome 18, an analogous syndrome but with expectedly more severe phenotype secondary to the combined deletions of genetic material from both the short (p-) and long arm (q-) of chromosome 18. We are reporting a case of a girl with ring chromosome 18 and deletions involving 18p11.32-18p11.21 and 18q21.31-18q23. The abnormalities observed on magnetic resonance imaging are discussed with a specific focus on the evolution and significance of associated white matter changes.
authors.affiliation: Division of Pediatric Neurology, McGill University, Montreal, Quebec, Canada.
authors.forename: Ruba
authors.initials: R
authors.lastname: Benini
authors.forename: Christine
authors.initials: C
authors.lastname: Saint-Martin
authors.forename: Michael I
authors.initials: MI
authors.lastname: Shevell
authors.forename: Genevieve
authors.initials: G
authors.lastname: Bernard
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics* / Q000503:physiopathology; D002648:Child; D002869:Chromosome Aberrations; D002887:Chromosomes, Human, Pair 18; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D004676:Myelin Basic Protein / Q000235:genetics / Q000378:metabolism*; D012303:Ring Chromosomes
chemical_list: D004676:Myelin Basic Protein