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| Intellectual disability v3.982 | DDB1 |
Arina Puzriakova changed review comment from: - PMID: 33743206 (2021) - 8 unrelated individuals with de novo variants in DDB1, including one recurrent variant in four individuals (c.637G>A, p.Glu213Lys) and two different substitutions at the same amino acid residue (p.Arg188Trp and p.Arg188Gln). Clinical features were consistent and include hypotonia (7/8) and mild-moderate developmental delay or intellectual disability (8/8) and similar facial gestalt. Brachydactyly was common and most noticeable in the feet (6/8), and two individuals had cutaneous toe syndactyly. All three older individuals had a BMI in the obese range for their age. Functional studies using patient-derived lymphoblasts showed altered DDB1 function resulting in abnormal DNA damage signatures and histone methylation following UV-induced DNA damage. Sources: Literature; to: - PMID: 33743206 (2021) - 8 unrelated individuals with de novo variants in DDB1, including one recurrent variant in four individuals (c.637G>A, p.Glu213Lys) and two different substitutions at the same amino acid residue (p.Arg188Trp and p.Arg188Gln). Clinical features were consistent and include hypotonia (7/8) and mild-moderate developmental delay or intellectual disability (8/8) and similar facial gestalt. Brachydactyly was common and most noticeable in the feet (6/8), and two individuals had cutaneous toe syndactyly. All three older individuals had a BMI in the obese range for their age. Functional studies using patient-derived lymphoblasts showed altered DDB1 function resulting in abnormal DNA damage signatures and histone methylation following UV-induced DNA damage. Variants in other CRL4 complex components, such as CUL4B (MIM# 300304) and PHIP (MIM# 612870), have been shown to cause overlapping phenotypes consisting of syndromic ID with hypotonia and obesity. Sources: Literature |
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| Intellectual disability v2.468 | CUL4B | Louise Daugherty Source Victorian Clinical Genetics Services was added to CUL4B. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability | CUL4B | BRIDGE consortium edited their review of CUL4B | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability | CUL4B | BRIDGE consortium edited their review of CUL4B | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability | CUL4B | BRIDGE consortium reviewed CUL4B | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||