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Open Access Research article

Mutation in MEOX1 gene causes a recessive Klippel-Feil syndrome subtype

Fatih Bayrakli12*, Bulent Guclu3, Cengiz Yakicier4, Hatice Balaban5, Ugur Kartal2, Bekir Erguner6, Mahmut Samil Sagiroglu6, Sirin Yuksel4, Ahmet Rasit Ozturk7, Burak Kazanci3, Unal Ozum1 and Hamit Zafer Kars1

Author Affiliations

1 Department of Neurosurgery, Cumhuriyet University School of Medicine, Kampus, Merkez, 58140, Sivas, Turkey

2 Molecular Neurogenetics Research Laboratory, Department of Neurosurgery, Cumhuriyet University School of Medicine, Sivas, Turkey

3 Neurosurgery Clinic, Ministry of Health, Sevket Yilmaz Research and Training Hospital, Bursa, Turkey

4 Department of Medical Biology, Acibadem University School of Medicine, İstanbul, Turkey

5 Department of Neurology, Cumhuriyet University School of Medicine, Sivas, Turkey

6 TUBITAK BILGEM, Kocaeli, Turkey

7 Informatics Institute, Middle East Technical University, Ankara, Turkey

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BMC Genetics 2013, 14:95  doi:10.1186/1471-2156-14-95

Published: 28 September 2013

Abstract

Background

Klippel-Feil syndrome (KFS) is characterized by the developmental failure of the cervical spine and has two dominantly inherited subtypes. Affected individuals who are the children of a consanguineous marriage are extremely rare in the medical literature, but the gene responsible for this recessive trait subtype of KFS has recently been reported.

Results

We identified a family with the KFS phenotype in which their parents have a consanguineous marriage. Radiological examinations revealed that they carry fusion defects and numerical abnormalities in the cervical spine, scoliosis, malformations of the cranial base, and Sprengel’s deformity. We applied whole genome linkage and whole-exome sequencing analysis to identify the chromosomal locus and gene mutated in this family. Whole genome linkage analysis revealed a significant linkage to chromosome 17q12-q33 with a LOD score of 4.2. Exome sequencing identified the G > A p.Q84X mutation in the MEOX1 gene, which is segregated based on pedigree status. Homozygous MEOX1 mutations have reportedly caused a similar phenotype in knockout mice.

Conclusions

Here, we report a truncating mutation in the MEOX1 gene in a KFS family with an autosomal recessive trait. Together with another recently reported study and the knockout mouse model, our results suggest that mutations in MEOX1 cause a recessive KFS phenotype in humans.

Keywords:
Klippel-Feil syndrome; MEOX1; Whole-exome sequencing; Vertebra; Whole genome linkage analysis