Alternative titles and symbols : Mental retardation, fra12a type;
Description : FRA12A is a folate-sensitive chromosomal fragile site prone to breakage. No consistent
phenotype has been observed with FRA12A, and it can be inherited without phenotypic
effect (Berg et al., 2000). However, mental retardation with or without other anomalies
has been described in patients with over 40% of cells expressing FRA12A (Winnepenninckx
et al., 2007).;
Inheritance : Autosomal dominant;
Molecular basis : Caused by a trinucleotide repeat expansion (CGG)n in the B homolog of the disco-interacting
protein 2 homolog B gene (DIP2B, 611379.0001);