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Mortar01:29

Mortar

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Mortar, a mixture of Portland cement, hydrated lime, sand, and water, is a crucial binding material in construction. Its primary function is to join masonry units together, filling gaps and ensuring a uniform distribution of weight across the structure. This helps in preventing potential weaknesses. Mortar also serves as a protective barrier against environmental elements such as water and wind, thereby safeguarding the interior of the structure. It also compensates for surface irregularities...
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Mortar Properties01:17

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Design Example: Managing Concrete Workability01:14

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This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
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Overview of Admixture Mapping.

Daniel Shriner1

  • 1Center for Research on Genomics and Global Health, National Human Genome Research Institute, Bethesda, Maryland.

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|February 14, 2023
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Summary
This summary is machine-generated.

Admixture mapping identifies disease risks linked to ancestry. Recent advancements improve methods for inferring local ancestry and integrating with association testing for better genetic insights.

Keywords:
admixtureadmixture mappingancestry

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Area of Science:

  • Genetics
  • Population Genetics
  • Statistical Genetics

Background:

  • Admixture mapping is a powerful gene mapping technique for diseases with differential ancestry-related risk.
  • It is frequently utilized in populations with mixed Native American, European, and West African ancestry, such as in the United States.
  • Recent advancements have refined methods for ancestry inference and extended the application of admixture mapping within linear mixed models.

Purpose of the Study:

  • To provide an overview of the key concepts in admixture mapping.
  • To describe methods for inferring local ancestry.
  • To present strategies for conducting admixture mapping based on study design and compare it with linkage and association analyses.

Main Methods:

  • Review of established and novel admixture mapping methodologies.
  • Discussion of techniques for local ancestry inference using genetic markers.
  • Comparison of admixture mapping with linkage analysis and association testing, focusing on integration strategies.

Main Results:

  • Admixture mapping effectively identifies genetic loci associated with disease risk influenced by population admixture.
  • Improvements in methods and reference data enhance the accuracy of ancestry inference.
  • Integration of admixture mapping with association testing offers a more comprehensive approach to gene mapping.

Conclusions:

  • Admixture mapping is a valuable tool for genetic studies in admixed populations.
  • Advances in methodology enable more precise local ancestry inference and robust gene mapping.
  • Combining admixture mapping with association testing maximizes the power to detect disease-related genetic variants.