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Related Concept Videos

Pleiotropy01:33

Pleiotropy

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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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.

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Renpenning syndrome maps to Xp11

R E Stevenson1, J F Arena, E Ouzts

  • 1Greenwood Genetic Center, Greenwood, SC 29646, USA. karen@ggc.org

American Journal of Human Genetics
|May 23, 1998
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X-linked mental retardation (XLMR) is linked to genes on the X chromosome. Studies on the Renpenning syndrome family identified a specific region on the X chromosome associated with this condition.

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Area of Science:

  • Genetics
  • Neuroscience
  • Human Biology

Background:

  • X-linked mental retardation (XLMR) is a significant cause of intellectual disability in males, with numerous genes implicated on the X chromosome.
  • Understanding the genetic basis of XLMR is crucial for diagnosis and potential therapeutic strategies.

Observation:

  • Clinical and molecular studies focused on a Mennonite family with a history of X-linked mental retardation, first reported in 1962.
  • The affected males presented with severe mental retardation, microcephaly, up-slanting palpebral fissures, small testes, and shorter stature, without major malformations or neuromuscular issues.

Findings:

  • The Renpenning syndrome was mapped to the Xp11.2-p11.4 region of the X chromosome.
  • Genetic linkage analysis yielded a maximum LOD score of 3.21, indicating a strong association between the syndrome and markers DXS1039 and DXS1068.

Implications:

  • Renpenning syndrome (MRXS8) shares features with other XLMR syndromes, suggesting potential allelic relationships that require further investigation.
  • Isolation of the causative gene for Renpenning syndrome could provide insights into the genetic architecture of X-linked intellectual disabilities.