Two unrelated children with overlapping 6q25.3 deletions, motor speech disorders, and language delays

Beate Peter, Hope Lancaster, Caitlin Vose, Amna Fares, Isabelle Schrauwen, Matthew Huentelman

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Interstitial and terminal 6q25 deletions are associated with developmental delays, hypotonia, eye pathologies, craniofacial dysmorphologies, and structural brain anomalies. In most cases, speech and language deficits are not described in detail. We report on a case (Patient 1, age 7 years) with a de novo 6q25.3-qter deletion, 11.1 Mb long and encompassing 108 genes, and a case (Patient 2, age 5 years) with an inherited interstitial 6q25.3 deletion, located within Patient 1's deletion region and 403 kb long, the smallest 6q25 deletion reported to date. Both children have hypotonia, motor speech disorders, and expressive language delays. Patient 1's speech was characterized by childhood apraxia of speech (CAS) and dysarthria. Other findings include developmental delay, ataxic cerebral palsy, optic nerve dysplagia, and atypical brain morphologies regarding the corpus callosum and gyration patterns, a clinical profile that closely matches a previously reported case with a nearly identical deletion. Patient 2 had speech characterized by CAS and typical nonverbal processing abilities. His father, a carrier, had typical speech and language but showed difficulties with complex motor speech and hand motor tasks, similar to other adults with residual signs of CAS. The small deletion in this family contains the IGF2R-AIRN-SLC22A2-SLC22A3 gene cluster, which is associated with imprinting and maternal-specific expression of Igf2R, Slc22a2, and Slc22a3 in mice, whereas imprinting in humans is a polymorphic trait. The shared phenotypes in the two patients might be associated with the deletion of the gene cluster.

Original languageEnglish (US)
Pages (from-to)2659-2669
Number of pages11
JournalAmerican Journal of Medical Genetics, Part A
Volume173
Issue number10
DOIs
StatePublished - Oct 1 2017

Fingerprint

Language Development Disorders
Speech Disorders
Apraxias
Muscle Hypotonia
Multigene Family
Language
Dysarthria
Aptitude
Motor Disorders
Corpus Callosum
Brain
Optic Nerve
Fathers
Hand
Mothers
Pathology
Phenotype

Keywords

  • 6q25 microdeletion syndrome
  • fine/gross motor delay
  • hypotonia
  • IGF2R-AIRN-SLC22A2-SLC22A3 gene cluster
  • language delay
  • motor speech disorder

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

Cite this

Two unrelated children with overlapping 6q25.3 deletions, motor speech disorders, and language delays. / Peter, Beate; Lancaster, Hope; Vose, Caitlin; Fares, Amna; Schrauwen, Isabelle; Huentelman, Matthew.

In: American Journal of Medical Genetics, Part A, Vol. 173, No. 10, 01.10.2017, p. 2659-2669.

Research output: Contribution to journalArticle

Peter, Beate ; Lancaster, Hope ; Vose, Caitlin ; Fares, Amna ; Schrauwen, Isabelle ; Huentelman, Matthew. / Two unrelated children with overlapping 6q25.3 deletions, motor speech disorders, and language delays. In: American Journal of Medical Genetics, Part A. 2017 ; Vol. 173, No. 10. pp. 2659-2669.
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abstract = "Interstitial and terminal 6q25 deletions are associated with developmental delays, hypotonia, eye pathologies, craniofacial dysmorphologies, and structural brain anomalies. In most cases, speech and language deficits are not described in detail. We report on a case (Patient 1, age 7 years) with a de novo 6q25.3-qter deletion, 11.1 Mb long and encompassing 108 genes, and a case (Patient 2, age 5 years) with an inherited interstitial 6q25.3 deletion, located within Patient 1's deletion region and 403 kb long, the smallest 6q25 deletion reported to date. Both children have hypotonia, motor speech disorders, and expressive language delays. Patient 1's speech was characterized by childhood apraxia of speech (CAS) and dysarthria. Other findings include developmental delay, ataxic cerebral palsy, optic nerve dysplagia, and atypical brain morphologies regarding the corpus callosum and gyration patterns, a clinical profile that closely matches a previously reported case with a nearly identical deletion. Patient 2 had speech characterized by CAS and typical nonverbal processing abilities. His father, a carrier, had typical speech and language but showed difficulties with complex motor speech and hand motor tasks, similar to other adults with residual signs of CAS. The small deletion in this family contains the IGF2R-AIRN-SLC22A2-SLC22A3 gene cluster, which is associated with imprinting and maternal-specific expression of Igf2R, Slc22a2, and Slc22a3 in mice, whereas imprinting in humans is a polymorphic trait. The shared phenotypes in the two patients might be associated with the deletion of the gene cluster.",
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