Recurrent interstitial deletions of proximal 18q: A new syndrome involving expressive speech delay

Jannine D. Cody, Courtney Sebold, Amtul Malik, Patricia Heard, Erika Carter, Analisa Crandall, Bridgette Soileau, Margaret Semrud-Clikeman, Catherine M. Cody, L. Jean Hardies, Jinqi Li, Jack Lancaster, Peter T. Fox, Robert F. Stratton, Brian Perry, Daniel E. Hale

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Most deletions of the long arm of chromosome 18 involve some part of the most distal 30 Mb. We have identified five individuals with cytogenetically diagnosed interstitial deletions that are all proximal to this commonly deleted region. The extent of their deletions was characterized using molecular and molecular cytogenetic techniques. Each participant was assessed under the comprehensive clinical evaluation protocol of the Chromosome 18 Clinical Research Center. Three of the five individuals were found to have apparently identical interstitial deletions between positions of 37.5 and 42.5 Mb (18q12.3 → 18q21.1). One individual's deletion was much larger and extended from a more proximal breakpoint position of 23 Mb (18q11.2) to a more distal breakpoint at 43 Mb (18q21.1). The fifth individual had a proximal breakpoint identical to the other three, but a distal breakpoint at 43.5 Mb (18q21.1). The clinical findings were of interest because the three individuals with the smaller deletions lacked major anomalies. All five individuals were developmentally delayed; however, the discrepancy between their expressive and receptive language abilities was striking, with expressive language being much more severely affected. This leads us to hypothesize that there are genes in this region of chromosome 18 that are specific to the neural and motor planning domains necessary for speech. Additionally, this may represent a previously underappreciated syndrome since these children do not have the typical clinical abnormalities that would lead to a chromosome analysis.

Original languageEnglish (US)
Pages (from-to)1181-1190
Number of pages10
JournalAmerican Journal of Medical Genetics, Part A
Volume143
Issue number11
DOIs
StatePublished - Jun 1 2007

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Language Development Disorders
Chromosomes, Human, Pair 18
Language
Aptitude
Cytogenetic Analysis
Clinical Protocols
Chromosomes
Research
Genes

All Science Journal Classification (ASJC) codes

  • Genetics
  • Genetics(clinical)

Cite this

Cody, Jannine D. ; Sebold, Courtney ; Malik, Amtul ; Heard, Patricia ; Carter, Erika ; Crandall, Analisa ; Soileau, Bridgette ; Semrud-Clikeman, Margaret ; Cody, Catherine M. ; Hardies, L. Jean ; Li, Jinqi ; Lancaster, Jack ; Fox, Peter T. ; Stratton, Robert F. ; Perry, Brian ; Hale, Daniel E. / Recurrent interstitial deletions of proximal 18q : A new syndrome involving expressive speech delay. In: American Journal of Medical Genetics, Part A. 2007 ; Vol. 143, No. 11. pp. 1181-1190.
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abstract = "Most deletions of the long arm of chromosome 18 involve some part of the most distal 30 Mb. We have identified five individuals with cytogenetically diagnosed interstitial deletions that are all proximal to this commonly deleted region. The extent of their deletions was characterized using molecular and molecular cytogenetic techniques. Each participant was assessed under the comprehensive clinical evaluation protocol of the Chromosome 18 Clinical Research Center. Three of the five individuals were found to have apparently identical interstitial deletions between positions of 37.5 and 42.5 Mb (18q12.3 → 18q21.1). One individual's deletion was much larger and extended from a more proximal breakpoint position of 23 Mb (18q11.2) to a more distal breakpoint at 43 Mb (18q21.1). The fifth individual had a proximal breakpoint identical to the other three, but a distal breakpoint at 43.5 Mb (18q21.1). The clinical findings were of interest because the three individuals with the smaller deletions lacked major anomalies. All five individuals were developmentally delayed; however, the discrepancy between their expressive and receptive language abilities was striking, with expressive language being much more severely affected. This leads us to hypothesize that there are genes in this region of chromosome 18 that are specific to the neural and motor planning domains necessary for speech. Additionally, this may represent a previously underappreciated syndrome since these children do not have the typical clinical abnormalities that would lead to a chromosome analysis.",
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Cody, JD, Sebold, C, Malik, A, Heard, P, Carter, E, Crandall, A, Soileau, B, Semrud-Clikeman, M, Cody, CM, Hardies, LJ, Li, J, Lancaster, J, Fox, PT, Stratton, RF, Perry, B & Hale, DE 2007, 'Recurrent interstitial deletions of proximal 18q: A new syndrome involving expressive speech delay', American Journal of Medical Genetics, Part A, vol. 143, no. 11, pp. 1181-1190. https://doi.org/10.1002/ajmg.a.31729

Recurrent interstitial deletions of proximal 18q : A new syndrome involving expressive speech delay. / Cody, Jannine D.; Sebold, Courtney; Malik, Amtul; Heard, Patricia; Carter, Erika; Crandall, Analisa; Soileau, Bridgette; Semrud-Clikeman, Margaret; Cody, Catherine M.; Hardies, L. Jean; Li, Jinqi; Lancaster, Jack; Fox, Peter T.; Stratton, Robert F.; Perry, Brian; Hale, Daniel E.

In: American Journal of Medical Genetics, Part A, Vol. 143, No. 11, 01.06.2007, p. 1181-1190.

Research output: Contribution to journalArticle

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T1 - Recurrent interstitial deletions of proximal 18q

T2 - A new syndrome involving expressive speech delay

AU - Cody, Jannine D.

AU - Sebold, Courtney

AU - Malik, Amtul

AU - Heard, Patricia

AU - Carter, Erika

AU - Crandall, Analisa

AU - Soileau, Bridgette

AU - Semrud-Clikeman, Margaret

AU - Cody, Catherine M.

AU - Hardies, L. Jean

AU - Li, Jinqi

AU - Lancaster, Jack

AU - Fox, Peter T.

AU - Stratton, Robert F.

AU - Perry, Brian

AU - Hale, Daniel E.

PY - 2007/6/1

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N2 - Most deletions of the long arm of chromosome 18 involve some part of the most distal 30 Mb. We have identified five individuals with cytogenetically diagnosed interstitial deletions that are all proximal to this commonly deleted region. The extent of their deletions was characterized using molecular and molecular cytogenetic techniques. Each participant was assessed under the comprehensive clinical evaluation protocol of the Chromosome 18 Clinical Research Center. Three of the five individuals were found to have apparently identical interstitial deletions between positions of 37.5 and 42.5 Mb (18q12.3 → 18q21.1). One individual's deletion was much larger and extended from a more proximal breakpoint position of 23 Mb (18q11.2) to a more distal breakpoint at 43 Mb (18q21.1). The fifth individual had a proximal breakpoint identical to the other three, but a distal breakpoint at 43.5 Mb (18q21.1). The clinical findings were of interest because the three individuals with the smaller deletions lacked major anomalies. All five individuals were developmentally delayed; however, the discrepancy between their expressive and receptive language abilities was striking, with expressive language being much more severely affected. This leads us to hypothesize that there are genes in this region of chromosome 18 that are specific to the neural and motor planning domains necessary for speech. Additionally, this may represent a previously underappreciated syndrome since these children do not have the typical clinical abnormalities that would lead to a chromosome analysis.

AB - Most deletions of the long arm of chromosome 18 involve some part of the most distal 30 Mb. We have identified five individuals with cytogenetically diagnosed interstitial deletions that are all proximal to this commonly deleted region. The extent of their deletions was characterized using molecular and molecular cytogenetic techniques. Each participant was assessed under the comprehensive clinical evaluation protocol of the Chromosome 18 Clinical Research Center. Three of the five individuals were found to have apparently identical interstitial deletions between positions of 37.5 and 42.5 Mb (18q12.3 → 18q21.1). One individual's deletion was much larger and extended from a more proximal breakpoint position of 23 Mb (18q11.2) to a more distal breakpoint at 43 Mb (18q21.1). The fifth individual had a proximal breakpoint identical to the other three, but a distal breakpoint at 43.5 Mb (18q21.1). The clinical findings were of interest because the three individuals with the smaller deletions lacked major anomalies. All five individuals were developmentally delayed; however, the discrepancy between their expressive and receptive language abilities was striking, with expressive language being much more severely affected. This leads us to hypothesize that there are genes in this region of chromosome 18 that are specific to the neural and motor planning domains necessary for speech. Additionally, this may represent a previously underappreciated syndrome since these children do not have the typical clinical abnormalities that would lead to a chromosome analysis.

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