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Related Concept Videos

Heritability01:06

Heritability

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Heritability is a statistical concept that measures the degree to which genetic differences among individuals contribute to trait variations within a population. It is a fundamental idea in genetics, often prone to misinterpretation. Heritability is expressed as a percentage, reflecting the proportion of variation in a specific trait across a population that can be linked to genetic differences. However, it's important to understand that heritability does not determine how "genetic"...
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Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
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Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
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Horizontal gene transfer (HGT) is a process where genetic material moves between organisms within the same generation, unlike vertical gene transfer, which occurs from parent to offspring. HGT plays a crucial role in microbial evolution, adaptation, and survival, particularly in shared environments like the human gut.Mobile genetic elements such as plasmids, prophages, integrons, insertion sequences, and transposons facilitate this process. HGT occurs through three primary mechanisms:...
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Graph pangenome captures missing heritability and empowers tomato breeding.

Yao Zhou1, Zhiyang Zhang1, Zhigui Bao1

  • 1Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China.

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|June 8, 2022
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Summary
This summary is machine-generated.

A new tomato graph pangenome identified millions of genetic variants, significantly increasing heritability estimates for complex traits. This advancement aids in identifying genes for crop improvement and understanding genetic contributions.

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Area of Science:

  • Genomics
  • Plant Breeding
  • Quantitative Genetics

Background:

  • Missing heritability is a key challenge in understanding complex traits.
  • Accurate identification of all causal genetic variants is crucial for genetic analysis.

Purpose of the Study:

  • To construct a graph pangenome for tomato.
  • To improve heritability estimation and genetic analyses of complex traits using the pangenome.

Main Methods:

  • Catalogued over 19 million variants from 838 tomato genomes.
  • Developed 32 new reference-level genome assemblies.
  • Performed genome-wide association studies and heritability estimation for 20,323 traits.

Main Results:

  • The graph pangenome approach increased estimated heritability by 24% (0.41 vs. 0.33).
  • This increase is attributed to resolving linkage disequilibrium with structural variants.
  • Identified new genes contributing to traits like soluble solid content.

Conclusions:

  • Graph pangenomes enhance heritability estimation and genetic analyses.
  • Structural variants are key to resolving complex trait genetics.
  • This pangenome resource will accelerate tomato genetic improvement.