Ann Lab Med.  2018 May;38(3):242-248. 10.3343/alm.2018.38.3.242.

Spectrum of MNX1 Pathogenic Variants and Associated Clinical Features in Korean Patients with Currarino Syndrome

Affiliations
  • 1Department of Laboratory Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
  • 2Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul, Korea.
  • 3Department of Laboratory Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
  • 4Department of Laboratory Medicine, Gyeongsang National University Changwon Hospital, Changwon, Korea.
  • 5Department of Laboratory Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
  • 6Department of Pediatric Surgery, Seoul National University College of Medicine, Seoul, Korea. spkhy02@snu.ac.kr

Abstract

BACKGROUND
The major genetic cause of Currarino syndrome (CS), a congenital malformation syndrome typically characterized by sacral agenesis, anorectal malformation, and presence of a pre-sacral mass, is known to be pathogenic variants in motor neuron and pancreas homeobox 1 (MNX1), which exist in almost all familial cases and 30% of sporadic cases. Less commonly, a large deletion or a complex rearrangement involving the 7q36 region is associated with CS. We investigated the spectrum of MNX1 pathogenic variants and associated clinical features in the Korean patients with CS.
METHODS
We enrolled 25 patients with CS, including 24 sporadic cases and one familial case. Direct sequencing of MNX1 and multiplex ligation-dependent probe amplification were performed. We also analyzed clinical phenotypes and evaluated genotype-phenotype correlations.
RESULTS
We identified six novel variants amongst a total of six null variants, one missense variant, and one large deletion. The null variants included four frameshift variants (p.Gly98Alafs*124, p.Gly145Alafs*77, p.Gly151Leufs*67, and p.Ala216Profs*5) and two nonsense variants (p.Tyr186* and p.Gln212*). The missense variant, p.Lys295Gln, was located in the highly-conserved homeobox domain and was predicted to be deleterious. A large deletion involving the 7q36 region was detected in one patient. Pathogenic variants in MNX1 were detected in 28% of all CS cases and 25% of sporadic cases. The clinical phenotype was variable in patients with and without pathogenic variants; no significant genotype-phenotype correlation was observed.
CONCLUSIONS
This study revealed the spectrum and phenotypic variability of MNX1 pathogenic variants in the Korean population.

Keyword

Currarino syndrome; MNX1; Pathogenic variant; Korean

MeSH Terms

Genes, Homeobox
Genetic Association Studies
Humans
Motor Neurons
Multiplex Polymerase Chain Reaction
Pancreas
Phenotype
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