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Heritability01:06

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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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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
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Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
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Human Genetics01:28

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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Rare genetic variants explain missing heritability in smoking.

Seon-Kyeong Jang1, Luke Evans2,3, Allison Fialkowski1

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Rare genetic variants significantly contribute to smoking behaviors, explaining a substantial portion of heritability. This finding addresses the

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Area of Science:

  • Genetics
  • Behavioral Science
  • Population Genetics

Background:

  • Complex phenotypes show a 'missing heritability' gap, where common genetic variants explain less variation than family studies suggest.
  • Understanding the genetic architecture of complex traits like tobacco use is crucial.

Purpose of the Study:

  • To investigate the role of rare genetic variants in the heritability of tobacco use.
  • To quantify the contribution of rare variants to smoking traits using whole-genome sequencing data.

Main Methods:

  • Whole-genome sequencing of up to 26,257 European ancestry and 11,743 African ancestry individuals.
  • Estimation of single-nucleotide-polymorphism-based heritability for four smoking traits.
  • Analysis of rare variants with minor allele frequencies between 0.01% and 1%.

Main Results:

  • In European ancestries, rare variants accounted for 35-74% of the heritability of smoking traits, with estimates 1.5-4 times higher than previous common variant-only estimates.
  • Heritability estimates for smoking traits ranged from 0.13 to 0.28 in European ancestries and 0.03 to 0.33 in African ancestries.
  • Rare variants explained 60% to 100% of pedigree-based heritability estimates.

Conclusions:

  • Rare genetic variants are significant contributors to the heritability of smoking.
  • This study helps resolve the 'missing heritability' puzzle for complex traits.
  • Findings highlight the importance of rare variants in understanding genetic predispositions to tobacco use.