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Familial aggregation in specific language impairment.

P Tallal1, L S Hirsch, T Realpe-Bonilla

  • 1Center for Molecular and Behavioral Neuroscience, Rutgers, The State University of New Jersey, Newark 07102, USA. tallal@axon.rutgers.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|November 16, 2001
PubMed
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Specific language impairment (SLI) shows strong familial aggregation, with higher rates in relatives of affected individuals. Parental and sibling language impairment significantly increases offspring risk, confirming genetic links.

Area of Science:

  • Linguistics
  • Genetics
  • Developmental Psychology

Background:

  • Specific language impairment (SLI) is a developmental disorder affecting language acquisition.
  • Understanding the genetic and familial components of SLI is crucial for early identification and intervention.
  • Previous research suggests a potential familial link, but comprehensive family studies are needed.

Purpose of the Study:

  • To investigate the familial aggregation of language disorders using a case-control family study design.
  • To compare impairment rates derived from direct testing versus family history questionnaires.
  • To examine the influence of parental language impairment on offspring risk.

Main Methods:

  • A case-control family study assessed language abilities in primary relatives (parents, siblings) of probands with SLI and matched controls.

Related Experiment Videos

  • Language impairment was determined through current testing and compared with family history data.
  • Offspring impairment rates were analyzed based on the number of affected parents.

    • Main Results:

    • Language impairment rates were significantly higher in mothers, fathers, sisters, and brothers of SLI probands compared to controls.
    • Brothers of SLI probands showed higher impairment rates than sisters.
    • Offspring risk increased substantially with parental impairment: 13% (no parent affected), 40% (one parent affected), 71.4% (both parents affected).

    Conclusions:

    • Specific language impairment exhibits significant familial aggregation, indicating a strong genetic component.
    • Family history questionnaires provide group-level estimates comparable to direct testing, but individual-level agreement is poor.
    • The study underscores the importance of considering family history in assessing and understanding language disorders.