Related Experiment Video
Updated: Aug 10, 2026
05:51
A Strategy to Identify de Novo Mutations in Common Disorders such as Autism and Schizophrenia
Published on: June 15, 2011
Genetic association between Notch4 polymorphisms and Japanese schizophrenics
Nobuto Shibata1, Tohru Ohnuma, Shinji Higashi
1Department of Psychiatry, Juntendo University School of Medicine, Tokyo, Japan. nobuto.shibata@nifty.ne.jp
Psychiatric Genetics
|March 16, 2006
Summary
This study investigated Notch4 gene single nucleotide polymorphisms and schizophrenia in Japanese samples. Results indicate no significant association between these specific polymorphisms and schizophrenia onset.
Area of Science:
- Genetics
- Psychiatry
- Molecular Biology
Background:
- Schizophrenia is a complex psychiatric disorder with a significant genetic component.
- The Notch4 gene has been implicated in neurodevelopmental processes relevant to schizophrenia.
- Investigating specific genetic variations, such as single nucleotide polymorphisms (SNPs), is crucial for understanding schizophrenia's etiology.
Purpose of the Study:
- To examine the association between three single nucleotide polymorphisms (SNPs) in the Notch4 gene and the risk of developing schizophrenia.
- To analyze the linkage disequilibrium (LD) among these SNPs within the Japanese population.
- To determine if specific Notch4 gene variants contribute to schizophrenia susceptibility.
Main Methods:
- Genotyping of three Notch4 gene SNPs using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP).
- Comparison of genotypic frequencies between schizophrenia patients and healthy controls using chi-squared tests.
- Assessment of linkage disequilibrium and haplotype frequencies using specialized software.
Main Results:
- No statistically significant association was found between two Notch4 SNPs and schizophrenia in the Japanese cohort.
- One nonsynonymous SNP showed a weak P-value, but its allelic frequencies were not positive.
- Strong linkage disequilibrium was observed between two SNPs, with weaker LD involving the third SNP, suggesting genetic heterogeneity.
Conclusions:
- The investigated Notch4 gene SNPs are unlikely to be major risk factors for schizophrenia in the studied Japanese population.
- The observed linkage disequilibrium patterns highlight potential genetic heterogeneity at the Notch4 locus.
- Further research with larger, diverse ethnic cohorts is recommended to fully elucidate the role of Notch4 in schizophrenia.
Related Concept Videos
03:14Notch Signaling Pathway
The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
03:14Notch Signaling Pathway
The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
01:29Biological Causes of Schizophrenia
Schizophrenia, a severe psychiatric disorder, arises from a complex interplay of biological factors, including genetic predisposition, structural brain abnormalities, neurotransmitter dysregulation, and developmental irregularities. These factors collectively contribute to the onset and progression of the disorder, which typically manifests in late adolescence or early adulthood.
Genetic Factors in Schizophrenia
The genetic basis of schizophrenia is strongly supported by family and twin studies.
Genetic Factors in Schizophrenia
The genetic basis of schizophrenia is strongly supported by family and twin studies.
01:05Single Nucleotide Polymorphisms-SNPs
A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
01:33Pleiotropy
Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
02:26Comparing Copy Number Variations and SNPs
Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...