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Interstitial Deletions at 6q14.1-q15 Associated with Obesity, Developmental Delay and a Distinct Clinical Phenotype
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medical Genetics.
National Centre for Medical Genetics, OLCHC, Dublin, Ireland.
Department of Medical Biosciences, Medical and Clinical Genetics, Umeå University, Umeå, Sweden.
Microarray Unit, Cytogenetics Laboratory, Western General Hospital, Edinburgh, UK.
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2010 (English)In: Molecular Syndromology, ISSN 1661-8769, Vol. 1, no 2, 75-81 p.Article in journal (Refereed) Published
Abstract [en]


Interstitial deletions of the long arm of chromosome 6 have been described in several patients with obesity and a Prader-Willi-like phenotype. Haploinsufficiency of the SIM1 gene located at 6q16.3 is suggested as being responsible for the regulation of body weight. Here we report on 2 patients with interstitial deletions at 6q14.1-q15 presenting with obesity and symptoms strikingly similar to those reported for deletions involving the SIM1 gene despite not having a deletion of this gene.


Array comparative genomic hybridisation was used to diagnose 2 children with obesity and developmental delay, revealing 2 interstitial deletions at 6q14.1-q15 of 8.73 and 4.50 Mb, respectively, and a region of overlap of 4.2-Mb.


The similar phenotype in the 2 patients was most likely due to a 4.2-Mb common microdeletion at 6q14.1-q15. Another patient has previously been described with an overlapping deletion. The 3 patients share several features, such as developmental delay, obesity, hernia, rounded face with full cheeks, epicanthal folds, short palpebral fissures, bulbous nose, large ears, and syndactyly between toes II and III.


Together with a previously reported patient, our study suggests that the detected deletions may represent a novel clinically recognisable microdeletion syndrome caused by haploinsufficiency of dosage-sensitive genes in the 6q14.1-q15 region.

Place, publisher, year, edition, pages
2010. Vol. 1, no 2, 75-81 p.
Keyword [en]
6q Deletion, Learning disability, Mental retardation, Obesity
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-140215DOI: 10.1159/000314025PubMedID: 21045960OAI: oai:DiVA.org:uu-140215DiVA: diva2:383251
Available from: 2011-01-04 Created: 2011-01-04 Last updated: 2013-09-17Bibliographically 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.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 1651-6206 ; 880
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
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)
Available from: 2013-04-17 Created: 2013-03-16 Last updated: 2013-08-30Bibliographically approved

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