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Related Concept Videos

Longitudinal Research02:20

Longitudinal Research

Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
Longitudinal Studies01:26

Longitudinal Studies

Longitudinal studies are also widely used in other medical and social science fields. For instance, in cardiovascular research, they can monitor patients' health over decades to identify risk factors for heart disease, such as high cholesterol or smoking, and evaluate the long-term effectiveness of preventive measures. Similarly, in mental health studies, researchers might follow individuals from adolescence into adulthood to understand the development and progression of conditions like...
Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
Genome-wide Association Studies-GWAS01:11

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...
Study Designs in Epidemiology01:20

Study Designs in Epidemiology

Epidemiological study designs are fundamental tools for investigating the distribution, determinants, and control of health conditions in populations. They help researchers understand the relationships between exposures and outcomes, and they broadly fall into two categories: "observational" and "experimental" studies.
Observational studies are those where the researcher does not intervene but rather observes natural variations. They include cross-sectional, cohort, and case-control studies.

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Related Experiment Video

Updated: Jul 10, 2026

The Replica Set Method: A High-throughput Approach to Quantitatively Measure Caenorhabditis elegans Lifespan
11:58

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A novel sampling design to explore gene-longevity associations: the ECHA study.

Francesco De Rango1, Serena Dato, Dina Bellizzi

  • 1Department of Cell Biology, University of Calabria, Rende, Italy.

European Journal of Human Genetics : EJHG
|November 9, 2007
PubMed
Summary

This study explored the genetic basis of longevity using a novel cousin-pair design. Significant transmission ratio distortion was found in discordant families, suggesting genetic influences on lifespan.

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Area of Science:

  • Genetics
  • Gerontology
  • Human Longevity

Background:

  • Familial longevity suggests a genetic component.
  • Previous studies identified potential longevity genes in specific chromosomal regions.
  • A novel experimental design was needed to investigate genetic contributions to longevity more effectively.

Purpose of the Study:

  • To investigate the genetic contribution to familial similarity in longevity.
  • To analyze haplotype sharing and transmission in cousin-pairs from concordant and discordant longevity families.
  • To assess the feasibility of a novel experimental design for longevity genetics research.

Main Methods:

  • A novel cousin-pair experimental design was implemented.
  • Families from Denmark, France, and Italy were screened for eligible trios (centenarian, child, child of sibling).
  • Haplotype phase was reconstructed, and Identical By Descent (IBD) sharing and Transmission Ratio Distortion (TRD) were analyzed for chromosomal regions 6p21.3 and 11p15.5.

Main Results:

  • A statistically significant Transmission Ratio Distortion (TRD) was observed in discordant families for both chromosomal regions (6p21.3 and 11p15.5).
  • Marginally significant TRD was found in concordant families at 6p21.3.
  • No significant difference in IBD sharing emerged between cousin-pairs from concordant and discordant sibling groups.

Conclusions:

  • The study identified significant genetic influences on longevity, particularly evident in discordant families.
  • The findings highlight challenges in sample recruitment for genetic studies of longevity.
  • The results provide insights for optimizing future genetic sampling strategies for human longevity research.