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Unbalanced de novo translocation in mother resulting in one child with a 6q13-q16 deletion and one child with a 6q13-q16 duplication
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medical Genetics.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medical Genetics.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medical Genetics.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Here we report on two sisters with reciprocal CNVs at 6q13-q16.1. Both the deletion and the duplication were inherited from the healthy mother carrying an insertion of 6q13-q16 to 15q11. The deleted region in one of the sisters has previously been described. However, to our knowledge this is the first report of a duplication at the region 6q13q16. In the report we submit a detailed phenotypical description of both patients as well as candidate genes for some of the various symptoms that the patients presented.

National Category
Medical Genetics
Research subject
Medical Genetics
Identifiers
URN: urn:nbn:se:uu:diva-197354OAI: oai:DiVA.org:uu-197354DiVA: diva2:612749
Available from: 2013-03-24 Created: 2013-03-24 Last updated: 2018-01-11Bibliographically approved
In thesis
1. Molecular and Clinical Characterization of Syndromes Associated With Intellectual Disability
Open this publication in new window or tab >>Molecular and Clinical Characterization of Syndromes Associated With Intellectual Disability
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Intellectual disability (ID) affects approximately 1-3% of the population and is defined as having an IQ below 70 as well as a significant limitation in adaptive behavior.

The implementation of chromosomal microarrays (CMA) into the field of clinical genetics has revolutionized the ability to find genetic aberrations responsible for different genetic disorders. Importantly. these technologies have allowed several new microdeletion and microduplication aberrations to be identified that otherwise would have escaped detection using more conventional methods. Finding the genetic etiology of a syndrome and its association to the phenotype is paramount to better health care, provision of tailored therapy, presymptomatic screening, accurate prognosis, recurrence risk evaluation and in some cases prenatal testing.

Despite the plethora of new information available, there are still a number of clinical and genetic features we do not fully understand.

The aim of this work was to identify regions and syndromes associated with ID by CMA analysis and to make a detailed clinical description of the affected patients’ phenotype.

In paper I we studied the 22q11.2 duplication syndrome and presented two familial cases with a description of both their genotype and phenotype. Additionally, 36 cases harboring the duplication were reviewed to further delineate the phenotype of the syndrome.

In paper II, we revealed two unrelated patients with a deletion at 6q14.1-q15 and a distinct phenotype. Together with one previously reported patient our study suggests that a novel, clinically recognizable microdeletion syndrome exists in these patients.

In paper III the phenotype and genotype of six unrelated patients with partially overlapping microdeletions at 10p12.31-p11.21 were described. Taken together with a previously reported patient we propose that these findings represent a new contiguous gene syndrome.

In paper IV, two sisters; one presenting with two tandem interstitial duplications and the other a large deletion over the same region (6q13-q16) were reported. The reason for the CNVs was a maternal de novo translocation. This is the first case describing the genotype and phenotype of this duplicated region at 6q13-q16.

In conclusion, four different genetic aberrations involved in the etiology of ID and their corresponding phenotypes and candidate genes have been characterized.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2013. 53 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 1651-6206 ; 880
Keyword
intellectual disability, 22q11.2 duplication syndrome, 6q deletion, 6q duplication, 10p deletion, developmental delay, mental retardation, dysmorphic features
National Category
Medical Genetics
Research subject
Medical Genetics
Identifiers
urn:nbn:se:uu:diva-197011 (URN)978-91-554-8628-0 (ISBN)
Public defence
2013-05-08, Rudbecksalen, Rudbecklaboratoriet, Dag Hammarskjölds väg 20, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2013-04-17 Created: 2013-03-16 Last updated: 2018-01-11Bibliographically approved

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Wentzel, ChristianAnnerén, GöranThuresson, Ann-Charlotte

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