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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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Genetics of aging bone.

Douglas J Adams1, David W Rowe2, Cheryl L Ackert-Bicknell3

  • 1Department of Orthopaedic Surgery, University of Connecticut Musculoskeletal Institute, University of Connecticut Health, Farmington, CT, 06030, USA.

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Summary
This summary is machine-generated.

Genetic factors influence skeletal changes with aging. Understanding the genetic control of age-related bone loss is crucial for reducing fracture risk and improving bone health.

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Area of Science:

  • Genetics
  • Bone Physiology
  • Aging

Background:

  • Aging leads to skeletal changes, including reduced bone mass and altered matrix composition, increasing fracture risk.
  • Genetic factors influence peak bone mass, shape, and composition, but human studies often focus on bone mineral density (BMD).
  • Rodent studies on bone genetics have primarily examined BMD, with some investigating bone strength, size, and shape.

Purpose of the Study:

  • To review the genetic control of bone strength and identify knowledge gaps.
  • To highlight the limitations of previous genetic studies in rodents and the potential of new mapping populations.
  • To emphasize the need for research into the genetic control of age-related bone loss.

Main Methods:

  • Review of forward genetic studies in humans and rodents.
  • Analysis of studies focusing on bone mineral density, bone strength, size, and shape.
  • Discussion of genetic mapping populations, including Advanced Intercrosses and the Collaborative Cross.

Main Results:

  • Previous genetic studies often identified loci affecting bone size rather than material properties.
  • Newer genetic mapping populations offer improved resolution for candidate gene identification.
  • A significant knowledge gap exists regarding the genetic control of age-related bone loss.

Conclusions:

  • Understanding the genetic basis of age-related bone loss is essential for addressing skeletal fragility.
  • Advanced genetic mapping techniques hold promise for future discoveries in bone genetics.
  • Further research is needed to elucidate the genetic factors contributing to age-related bone deterioration and fracture risk.