Related Experiment Video
Updated: Jun 25, 2026

10:41
Why Quantification Matters: Characterization of Phenotypes at the Drosophila Larval Neuromuscular Junction
Published on: May 12, 2016
Mapping quantitative trait loci in humans: achievements and limitations
Partha P Majumder1, Saurabh Ghosh
1Human Genetics Unit, Indian Statistical Institute, Kolkata, India. ppm@isical.ac.in
The Journal of Clinical Investigation
|June 3, 2005
Summary
Recent advances in statistical methods and genomic technologies enable mapping of quantitative traits. Further statistical refinements are needed for success, and the impact of human genome structure findings remains unclear.
Area of Science:
- Genetics and statistical methodology
- Quantitative trait mapping
Background:
- Statistical methods and genomic technologies have advanced trait mapping.
- Challenges remain in achieving greater success in quantitative trait mapping.
Purpose of the Study:
- To highlight the new era in quantitative trait mapping driven by technological and statistical advances.
- To identify areas for refinement and novel approaches in statistical mapping.
- To explore the potential impact of human genome structure findings on trait mapping.
Main Methods:
- Review of recent advances in statistical methods for genetic analysis.
- Examination of current genomic technologies relevant to trait mapping.
- Analysis of the implications of new findings on human genome structure.
Main Results:
- A new era in mapping clinically important quantitative traits has begun.
- Significant refinements and novel statistical approaches are necessary for further success.
- The influence of recent human genome structure discoveries on trait mapping is currently undetermined.
Conclusions:
- While progress has been made, the field of quantitative trait mapping requires further statistical innovation.
- The integration of new genomic insights, particularly regarding genome structure, presents both opportunities and uncertainties for future research.
More Related Videos
Related Concept Videos
Polygenic Traits
When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
X-linked Traits
In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
Polygenic Traits
When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
Genome-wide Association Studies-GWAS
Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...
GWAS does not require the identification of the target gene involved in...
Pharmacogenomics: Identification of New Drug Targets
Advances in genomics have profoundly influenced drug discovery by increasing both the speed and accuracy of pharmaceutical development. Pharmacogenomics, which examines how genetic variation influences drug response, facilitates the identification of novel therapeutic targets and enables patient stratification for personalized treatment. These strategies contribute to improved drug efficacy, minimized adverse effects, and more efficient clinical trial design.Mapping genetic differences...
Modern Molecular Taxonomy
Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...

