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Comparing Copy Number Variations and SNPs

Comparing 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%...

Biological Influences on Intelligence

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Intelligence is often thought to be linked to brain size, but the relationship is more complex than that. While brain size does correlate modestly with some abilities, like verbal skills, the connection is weaker for others, such as spatial reasoning. Other factors, like brain structure, also play crucial roles. For instance, despite Einstein's smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter more...

Environmental Influences on Intelligence

Environmental Influences on Intelligence

Despite the strong genetic influence on traits like intelligence, environmental factors significantly shape outcomes. For example, while over 90% of height variation is due to genetic differences, environmental factors such as nutrition also have a notable impact. Similarly, for intelligence, changes in a child's surroundings can significantly alter their IQ. Research shows that enriched environments boost children's academic success and help them develop key cognitive skills. Children from...

Human Genetics

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Karyotyping

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Single Nucleotide Polymorphisms-SNPs

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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,...

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Updated: Jun 4, 2026

Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants

Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants

Published on: February 21, 2015

Rare copy number deletions predict individual variation in intelligence.

Ronald A Yeo¹, Steven W Gangestad, Jingyu Liu

¹Department of Psychology, University of New Mexico, Albuquerque, New Mexico, United States of America. ryeo@unm.edu

|February 8, 2011

Summary

Rare genetic deletions negatively impact intellectual functioning, particularly in individuals of Anglo/White ethnicity. This finding highlights the role of mutation load in cognitive abilities and health.

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Area of Science:

Behavioral Genetics
Evolutionary Psychology
Human Genomics

Background:

Human intellectual functioning exhibits significant heritability.
Previous molecular genetic studies have had limited success in identifying specific genetic variants for intelligence.
Evolutionary perspectives suggest examining

Purpose of the Study:

Investigate the impact of rare copy number variations (CNVs) and their length on psychometric intelligence.
Explore the role of mutation load in cognitive abilities.
Examine potential moderation by socioeconomic status (SES) proxy (ethnicity).

Main Methods:

Collected genetic data using Illumina 1MDuoBeadChip Array from 202 adults with alcohol dependence.
Administered the Wechsler Abbreviated Scale of Intelligence (WASI) to 77 individuals.
Analyzed the impact of rare genetic deletions on intelligence in 74 individuals after outlier removal.

Main Results:

The total length of rare deletions significantly and negatively predicted intelligence (r = -0.30, p = 0.01).
Ethnicity (Anglo/White vs. Other) moderated the effect of deletion length on intelligence.
Larger negative effects of deletion length were observed in the Anglo/White group.

Conclusions:

Rare deletions (≤5% population frequency) adversely affect intellectual functioning.
Pleotropic effects may link intelligence with health and mental health.
Findings suggest mutation load is a factor in cognitive variation.