A rare missense variant in the RLIM gene (c.1067A>G; p.Tyr356Cys) segregated with disease in a three-generation Norwegian family with a novel X-linked intellectual disability syndrome characterized by autism, subtle facial dysmorphism, and severe feeding problems (Tonne et al., 2015).
Molecular Function
The protein encoded by this gene is a E3 ubiquitin protein ligase that targets LIM domain binding 1 (LDB1/CLIM) for proteasome-dependent degradation1. This protein and LDB1 are co-repressors of LHX1/LIM-1, a homeodomain transcription factor. By targeting ZFP42 for degradation, RLIM acts as an activator of random inactivation of X chromosome in the embryo.
External Links
References
Type
Title
Type of Disorder
Associated Disorders
Author, Year
Primary
Syndromic X-linked intellectual disability segregating with a missense variant in RLIM.
Knockdown of rlim by morpholino or knockout by CRISPR results in significantly reduced head size in zebrafish larvae. This phenotype is rescued by wild type human RLIM mRNA as well as a benigh variant but not human RLIM mRNA carrying patient-specific misssense changes.
References
Type
Title
Author, Year
Primary
Pathogenic variants in E3 ubiquitin ligase RLIM/RNF12 lead to a syndromic X-linked intellectual disability and behavior disorder.
Model Type:
Genetic
Model Genotype:
Homozygous
Mutation:
Zebrafish larvae at one- to two-cell stage were injected with 2ng splice-blocking morpholino against the third exonintron junction of rlim.
Allele Type: Loss-of-function
Strain of Origin: Unreported
Genetic Background: ES Cell Line: Mutant ES Cell Line: Model Source:
Model Type:
Genetic
Model Genotype:
Homozygous
Mutation:
F0 population of CRISPR-mutant rlim zebrafish embryos was generated by introducing small indels in the zebrafish ortholog of rlim using CRISPR/Cas9 genome editing approach.
Allele Type: Loss-of-function
Strain of Origin: Unreported
Genetic Background: ES Cell Line: Mutant ES Cell Line: Model Source: