Environmental Factors Don’t Explain Rise in Autism Prevalence
Peter Hess
In a twin cohort study design spanning three decades, a recent article featured in
JAMA Psychiatry supports a growing consensus that genetic factors play a larger role than environmental factors in the occurrence of autism spectrum disorder (ASD) and are thus unlikely to explain its increase in prevalence.
Rare Mutations in Autism Genes Tied to Intellectual Disability
Giorgia Guglielmi
Autistic people who have rare mutations in autism genes tend to have lower intelligence quotients (IQs) than those with common mutations, according to a new study published in
Journal of Medical Genetics.
Study Identifies Group of Genes with Altered Expression in Autism
EurekAlert
Regardless of the DNA mutations in any autistic individual, a new study points to a common gene expression profile and functional dysregulation. While progress has been hindered by mutational variability, these results may lead to the enhanced genetic diagnosis and treatment of autism spectrum disorder.
Alzheimer’s Gene Contributes to Blood-brain Barrier Breakdown
Sharon Reynolds
While the
APOE ε4 allele is known to contribute to the formation of beta-amyloid plaques and tau tangles, a neuroimaging study finds that older adults with one or more
APOE ε4 copies had increased breakdown of the blood-brain barrier in areas important for memory and cognition.
Brain Proteins May Mediate Effects of Genetic Variants on Some Neurological Phenotypes
GenomeWeb
While signals from genome-wide association studies are often difficult to interpret, recent research suggests that human proteome data could provide an opportunity to unravel the causal pathways underlying psychiatric and neurological phenotypes, including Alzheimer disease, depression, intelligence, and neuroticism.
New Research Sheds Light on Sex Imbalances in Diseases like Schizophrenia and Lupus
Meghana Keshavan
This
STAT article explores the implications of genetic research featured in
Nature regarding sex discrepancies observed in lupus, Sjögren’s syndrome, and schizophrenia. The inverse relationship between the occurrence of schizophrenia and autoimmune conditions seems to be exacerbated by copy number variation of C4 among the sexes.