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Novel MCA/ID syndrome with ASH1L mutation
Nobuhiko Okamoto1,2, Fuyuki Miya3,4, Tatsuhiko Tsunoda3,4
1Department of Medical Genetics, Osaka Medical Center and Research Institute for Maternal and Child Health, Osaka, Japan.
American Journal of Medical Genetics. Part A
|April 11, 2017
Summary
A novel mutation in ASH1L gene was found in a patient with severe intellectual disability and developmental abnormalities. This finding suggests ASH1L may cause a new multiple congenital anomalies/intellectual disability syndrome.
Area of Science:
- Genetics and Developmental Biology
- Epigenetics and Gene Regulation
Background:
- The ASH1L gene encodes a histone methyltransferase crucial for gene regulation during development.
- Heterozygous mutations in ASH1L are increasingly linked to intellectual disability (ID) and autism spectrum disorders (ASDs).
Observation:
- A patient presented with severe intellectual disability, microcephaly, growth failure, distinct facial features, delayed myelination, and skeletal issues.
- Genetic analysis revealed a novel mutation within the ASH1L gene in this patient.
Findings:
- The identified ASH1L mutation is associated with a complex phenotype including severe ID and multiple congenital anomalies.
- ASH1L's role in H3K36 methylation and its association with active genes, including Hox genes, highlights its developmental importance.
Implications:
- This case suggests that ASH1L gene abnormalities may lead to a previously unrecognized syndrome characterized by multiple congenital anomalies and intellectual disability (MCA/ID).
- Further research into ASH1L function could uncover new therapeutic targets for neurodevelopmental disorders.