title: A novel 1.4 Mb de novo microdeletion of chromosome 1q21.3 in a child with microcephaly, dysmorphic features and mental retardation.
abstract: A 2.5 years old girl presented with moderate mental retardation, microcephaly, arching eyebrows, low set ears, long eyelashes, persistent fetal pads and clinodactyly. About 1 Mb deletion in the chromosomal region 1q21.3 was identified using BAC array CGH analysis. The parental follow up FISH analysis was normal. Further study of the deletion using a 244K oligo-array of Agilent Technologies Inc., Santa Clara, CA, USA defined the deleted region to span about 1.4 Mb with approximate genomic location chr1:152,511,593-153,993,103 (NCBI genome build 36). This is a novel deletion, not reported to-date. Larger proximal 1q deletions that were previously reported typically included microcephaly, mental retardation and multiple congenital anomalies. The deleted region reported here includes at least 30 coding genes. Among them of interest is a three-gene cluster of the ephrin gene family (EFNA1, EFNA3 and EFNA4). This is a group of receptor protein-tyrosine kinase type genes with presumed, but not completely characterized function in nervous system development.
authors.affiliation: Richmond University Medical Center, Staten Island, NY, USA.
authors.forename: Sujana
authors.initials: S
authors.lastname: Reddy
authors.forename: Natalia
authors.initials: N
authors.lastname: Dolzhanskaya
authors.forename: Jacquelyn
authors.initials: J
authors.lastname: Krogh
authors.forename: Milen
authors.initials: M
authors.lastname: Velinov
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics*; D002675:Child, Preschool; D002872:Chromosome Deletion; D002878:Chromosomes, Human, Pair 1; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D008831:Microcephaly / Q000235:genetics*