Clinical and molecular characteristics of 1qter microdeletion syndrome: Delineating a critical region for corpus callosum agenesis/hypogenesis

B. W M Van Bon, D. A. Koolen, R. Borgatti, A. Magee, S. Garcia-Minaur, L. Rooms, W. Reardon, M. Zollino, M. C. Bonaglia, M. De Gregori, F. Novara, R. Grasso, R. Ciccone, H. A. Van Duyvenvoorde, A. M. Aalbers, R. Guerrini, E. Fazzi, W. M. Nillesen, S. McCullough, S. G. KantC. L. Marcelis, R. Pfundt, N. De Leeuw, D. Smeets, E. A. Sistermans, J. M. Wit, B. C. Hamel, H. G. Brunner, F. Kooy, O. Zuffardi, B. B A De Vries

Research output: Contribution to journalArticle

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Abstract

Background: Patients with a microscopically visible deletion of the distal part of the long arm of chromosome 1 have a recognisable phenotype, including mental retardation, microcephaly, growth retardation, a distinct facial appearance and various midline defects including corpus callosum abnormalities, cardiac, gastro-oesophageal and urogenital defects, as well as various central nervous system anomalies. Patients with a submicroscopic, subtelomeric 1qter deletion have a similar phenotype, suggesting that the main phenotype of these patients is caused by haploinsufficiency of genes in this region. Objective: To describe the clinical presentation of 13 new patients with a submicroscopic deletion of 1q43q44, of which nine were interstitial, and to report on the molecular characterisation of the deletion size. Results and conclusions: The clinical presentation of these patients has clear similarities with previously reported cases with a terminal 1q deletion. Corpus callosum abnormalities were present in 10 of our patients. The AKT3 gene has been reported as an important candidate gene causing this abnormality. However, through detailed molecular analysis of the deletion sizes in our patient cohort, we were able to delineate the critical region for corpus callosum abnormalities to a 360 kb genomic segment which contains four possible candidate genes, but excluding the AKT3 gene.

Original languageEnglish
Pages (from-to)346-354
Number of pages9
JournalJournal of Medical Genetics
Volume45
Issue number6
DOIs
Publication statusPublished - Jun 2008

Fingerprint

Agenesis of Corpus Callosum
Corpus Callosum
Genes
Phenotype
Nervous System Malformations
Haploinsufficiency
Microcephaly
Chromosomes, Human, Pair 1
Intellectual Disability
Central Nervous System
Growth

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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Clinical and molecular characteristics of 1qter microdeletion syndrome : Delineating a critical region for corpus callosum agenesis/hypogenesis. / Van Bon, B. W M; Koolen, D. A.; Borgatti, R.; Magee, A.; Garcia-Minaur, S.; Rooms, L.; Reardon, W.; Zollino, M.; Bonaglia, M. C.; De Gregori, M.; Novara, F.; Grasso, R.; Ciccone, R.; Van Duyvenvoorde, H. A.; Aalbers, A. M.; Guerrini, R.; Fazzi, E.; Nillesen, W. M.; McCullough, S.; Kant, S. G.; Marcelis, C. L.; Pfundt, R.; De Leeuw, N.; Smeets, D.; Sistermans, E. A.; Wit, J. M.; Hamel, B. C.; Brunner, H. G.; Kooy, F.; Zuffardi, O.; De Vries, B. B A.

In: Journal of Medical Genetics, Vol. 45, No. 6, 06.2008, p. 346-354.

Research output: Contribution to journalArticle

Van Bon, BWM, Koolen, DA, Borgatti, R, Magee, A, Garcia-Minaur, S, Rooms, L, Reardon, W, Zollino, M, Bonaglia, MC, De Gregori, M, Novara, F, Grasso, R, Ciccone, R, Van Duyvenvoorde, HA, Aalbers, AM, Guerrini, R, Fazzi, E, Nillesen, WM, McCullough, S, Kant, SG, Marcelis, CL, Pfundt, R, De Leeuw, N, Smeets, D, Sistermans, EA, Wit, JM, Hamel, BC, Brunner, HG, Kooy, F, Zuffardi, O & De Vries, BBA 2008, 'Clinical and molecular characteristics of 1qter microdeletion syndrome: Delineating a critical region for corpus callosum agenesis/hypogenesis', Journal of Medical Genetics, vol. 45, no. 6, pp. 346-354. https://doi.org/10.1136/jmg.2007.055830
Van Bon, B. W M ; Koolen, D. A. ; Borgatti, R. ; Magee, A. ; Garcia-Minaur, S. ; Rooms, L. ; Reardon, W. ; Zollino, M. ; Bonaglia, M. C. ; De Gregori, M. ; Novara, F. ; Grasso, R. ; Ciccone, R. ; Van Duyvenvoorde, H. A. ; Aalbers, A. M. ; Guerrini, R. ; Fazzi, E. ; Nillesen, W. M. ; McCullough, S. ; Kant, S. G. ; Marcelis, C. L. ; Pfundt, R. ; De Leeuw, N. ; Smeets, D. ; Sistermans, E. A. ; Wit, J. M. ; Hamel, B. C. ; Brunner, H. G. ; Kooy, F. ; Zuffardi, O. ; De Vries, B. B A. / Clinical and molecular characteristics of 1qter microdeletion syndrome : Delineating a critical region for corpus callosum agenesis/hypogenesis. In: Journal of Medical Genetics. 2008 ; Vol. 45, No. 6. pp. 346-354.
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T1 - Clinical and molecular characteristics of 1qter microdeletion syndrome

T2 - Delineating a critical region for corpus callosum agenesis/hypogenesis

AU - Van Bon, B. W M

AU - Koolen, D. A.

AU - Borgatti, R.

AU - Magee, A.

AU - Garcia-Minaur, S.

AU - Rooms, L.

AU - Reardon, W.

AU - Zollino, M.

AU - Bonaglia, M. C.

AU - De Gregori, M.

AU - Novara, F.

AU - Grasso, R.

AU - Ciccone, R.

AU - Van Duyvenvoorde, H. A.

AU - Aalbers, A. M.

AU - Guerrini, R.

AU - Fazzi, E.

AU - Nillesen, W. M.

AU - McCullough, S.

AU - Kant, S. G.

AU - Marcelis, C. L.

AU - Pfundt, R.

AU - De Leeuw, N.

AU - Smeets, D.

AU - Sistermans, E. A.

AU - Wit, J. M.

AU - Hamel, B. C.

AU - Brunner, H. G.

AU - Kooy, F.

AU - Zuffardi, O.

AU - De Vries, B. B A

PY - 2008/6

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N2 - Background: Patients with a microscopically visible deletion of the distal part of the long arm of chromosome 1 have a recognisable phenotype, including mental retardation, microcephaly, growth retardation, a distinct facial appearance and various midline defects including corpus callosum abnormalities, cardiac, gastro-oesophageal and urogenital defects, as well as various central nervous system anomalies. Patients with a submicroscopic, subtelomeric 1qter deletion have a similar phenotype, suggesting that the main phenotype of these patients is caused by haploinsufficiency of genes in this region. Objective: To describe the clinical presentation of 13 new patients with a submicroscopic deletion of 1q43q44, of which nine were interstitial, and to report on the molecular characterisation of the deletion size. Results and conclusions: The clinical presentation of these patients has clear similarities with previously reported cases with a terminal 1q deletion. Corpus callosum abnormalities were present in 10 of our patients. The AKT3 gene has been reported as an important candidate gene causing this abnormality. However, through detailed molecular analysis of the deletion sizes in our patient cohort, we were able to delineate the critical region for corpus callosum abnormalities to a 360 kb genomic segment which contains four possible candidate genes, but excluding the AKT3 gene.

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