title: The spectrum of growth abnormalities in children with 18q deletions.
abstract: The objective of this study was to assess the spectrum of growth abnormalities in children with 18q deletions. The growth axis of 50 individuals with a cytogenetically and molecularly confirmed 18q deletion was investigated by determining height, growth velocity, insulin-like growth factor I (IGF-I), IGF-binding protein-3, bone maturation, and response to pituitary stimulants of GH. Children with 18q deletions are short; 64% have a height more than -2 SD below the mean. Affected children also grow slowly; 68% have a growth velocity more than -1 SD below the mean. Half of the individuals have delayed bone maturation. Growth factors are skewed downward; 72% of the IGF-I values and 83% of the IGF-binding protein-3 values are below the mean for chronological age. Similarly, 72% of the children had a reduced or absent response to either of the GH stimulants, arginine and clonidine. In the total group of 50 children only 2 were normal for all parameters evaluated. Short stature and poor growth are common features of individuals with 18q deletions. GH deficiency is common in this cohort of patients and probably plays a role in the short stature seen in many of the affected individuals.
authors.affiliation: Departments of Pediatrics and Cellular and Structural Biology, University of Texas Health Science Center, San Antonio, Texas 78229, USA. hale@uthscsa.edu
authors.forename: D E
authors.initials: DE
authors.lastname: Hale
authors.forename: J D
authors.initials: JD
authors.lastname: Cody
authors.forename: J
authors.initials: J
authors.lastname: Baillargeon
authors.forename: R
authors.initials: R
authors.lastname: Schaub
authors.forename: M M
authors.initials: MM
authors.lastname: Danney
authors.forename: R J
authors.initials: RJ
authors.lastname: Leach
mesh_terms: D000293:Adolescent; D001846:Bone Development; D002648:Child; D002675:Child, Preschool; D002872:Chromosome Deletion; D002887:Chromosomes, Human, Pair 18 / Q000235:genetics*; D005260:Female; D005838:Genotype; D006130:Growth Disorders / Q000235:genetics*; D006728:Hormones / Q000097:blood; D006801:Humans; D007223:Infant; D018972:Insulin-Like Growth Factor Binding Protein 3 / Q000097:blood; D008297:Male; D010641:Phenotype; D013002:Somatomedins / Q000378:metabolism
chemical_list: D006728:Hormones; D018972:Insulin-Like Growth Factor Binding Protein 3; D013002:Somatomedins