Two novel UBR1 gene mutations ın a patient with Johanson Blizzard Syndrome: A mild phenotype without mental retardation

Tahir Atik; Miray Karakoyun; Maja Sukalo; Martin Zenker; Ferda Ozkinay; Sema Aydoğdu

doi:10.1016/j.gene.2015.06.082

Two novel UBR1 gene mutations ın a patient with Johanson Blizzard Syndrome: A mild phenotype without mental retardation

Gene. 2015 Oct 1;570(1):153-5. doi: 10.1016/j.gene.2015.06.082. Epub 2015 Jul 3.

Authors

Tahir Atik¹, Miray Karakoyun², Maja Sukalo³, Martin Zenker³, Ferda Ozkinay⁴, Sema Aydoğdu²

Affiliations

¹ Division of Genetics, Department of Pediatrics, School of Medicine, Ege University, Izmir, Turkey. Electronic address: tahiratik@yahoo.com.
² Department of Pediatric Gastroenterology, Hepatology and Nutrition, School of Medicine, Ege University, Izmir, Turkey.
³ Institute of Human Genetics, University Hospital Magdeburg, Magdeburg, Germany.
⁴ Division of Genetics, Department of Pediatrics, School of Medicine, Ege University, Izmir, Turkey.

PMID: 26149651
DOI: 10.1016/j.gene.2015.06.082

Abstract

Johanson-Blizzard Syndrome (JBS) (MIM #243800) is a rare autosomal recessive genetic disorder characterized by exocrine pancreatic insufficiency, abnormal facial appearance and varying degrees of mental retardation. Mutations in UBR1 gene (MIM *605981) are considered to be responsible for the syndrome. Here, we report a 3 year-old mentally normal JBS girl. The patient presented with exocrine pancreatic insufficiency as well as failure-to-thrive. On dysmorphological examination, she was noted to have an abnormal hair pattern with frontal upsweep and alae nasi hypoplasia. With these findings, JBS diagnosis was established clinically. Molecular analysis of the UBR1 gene revealed two inherited novel mutations; one coming from each parent. These novel mutations were c. 1280T>G and c. 2432+5G>C, and they were found to be disease causing via in-silico analysis. In conclusion, for patients with longstanding exocrine pancreatic insufficiency, it should be considered as being symptomatic of a far broader picture. To omit connection with rare genetic diseases, such as Johanson-Blizzard Syndrome, a detailed dysmorphological examination ought to be performed.

Keywords: Alae nasi; Exocrine pancreas; Hypothyroidism; Johanson–Blizzard Syndrome.

Publication types

Case Reports

MeSH terms

Anus, Imperforate / diagnosis*
Anus, Imperforate / genetics
Child, Preschool
DNA Mutational Analysis
Ectodermal Dysplasia / diagnosis*
Ectodermal Dysplasia / genetics
Female
Genetic Association Studies
Growth Disorders / diagnosis*
Growth Disorders / genetics
Hearing Loss, Sensorineural / diagnosis*
Hearing Loss, Sensorineural / genetics
Humans
Hypothyroidism / diagnosis*
Hypothyroidism / genetics
Intellectual Disability / diagnosis*
Intellectual Disability / genetics
Mutation, Missense
Nose / abnormalities*
Pancreatic Diseases / diagnosis*
Pancreatic Diseases / genetics
Phenotype
Point Mutation
Ubiquitin-Protein Ligases / genetics*

Substances

UBR1 protein, human
Ubiquitin-Protein Ligases

Supplementary concepts

Johanson Blizzard syndrome