Almashraki N, Abdulnabee MZ, Sukalo M, Alrajoudi A, Sharafadeen I, Zenker M. Johanson-Blizzard syndrome. World J Gastroenterol 2011; 17(37): 4247-4250
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Nabeel Almashraki, MD, Department of Pediatric, Al-Thawra Teaching Hospital, PO Box, 25122 Sana`a, Yemen. email@example.com
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Nabeel Almashraki, Mukarram Zainuddin Abdulnabee, Maja Sukalo, Abdullah Alrajoudi, Iman Sharafadeen, Martin Zenker
Nabeel Almashraki, Mukarram Zainuddin Abdulnabee, Abdullah Alrajoudi, Iman Sharafadeen, Department of Pediatric, Al-Thawra Teaching Hospital, 25122 Sana`a, Yemen
Martin Zenker, Maja Sukalo, Institute of Human Genetics, University Hospital, Magdeburg, Leipziger Str. 44, 39120 Magdeburg, Germany
ORCID number: $[AuthorORCIDs]
Author contributions: Almashraki N, Abdulnabee MZ, Alrajoudi A, Sharafadeen I designed the study and collected clinical data; Sukalo M and Zenker M performed the molecular genetic analysis; Almashraki N, Abdulnabee MZ and Zenker M wrote the paper.
Correspondence to: Nabeel Almashraki, MD, Department of Pediatric, Al-Thawra Teaching Hospital, PO Box, 25122 Sana`a, Yemen. firstname.lastname@example.org
Telephone: +967-01-711731632 Fax: +967-01-486642
Received: January 22, 2011 Revised: March 2, 2011 Accepted: March 9, 2011 Published online: October 7, 2011
Johanson-Blizzard syndrome (JBS) is a rare autosomal recessive disease characterized by exocrine pancreatic insufficiency, hypoplastic or aplastic nasal alae, cutis aplasia on the scalp, and other features including developmental delay, failure to thrive, hearing loss, mental retardation, hypothyroidism, dental abnormalities, and anomalies in cardiac and genitourinary systems. More than 60 cases of this syndrome have been reported to date. We describe the case of a male infant with typical symptoms of JBS. In addition, a new clinical feature which has not previously been documented, that is anemia requiring frequent blood transfusions and mild to moderate thrombocytopenia was observed. A molecular study was performed which revealed a novel homozygous UBR1 mutation. Possible explanations for this new association are discussed.
Johanson-Blizzard syndrome (JBS) is a rare autosomal recessive disorder, first described in 1971 by Johanson and Blizzard. The genetic defect causing the disease was unknown until 2005, when it was shown to result from mutations of the UBR1 gene located on chromosome 15q15-21. UBR1 encodes one of at least four functionally overlapping E3 ubiquitin ligases of the N-end rule pathway, a conserved proteolytic system whose substrates include proteins with destabilizing N-terminal residues 20. The precise pathophysiological link between altered protein degradation and the clinical anomalies observed in JBS remains to be determined.
The reported cases of JBS showed no difference in gender. Parental consanguinity is frequently observed. The typical clinical features of JBS are the following (with decreasing frequency): exocrine pancreatic insufficiency, hypoplasia/aplasia of the alae nasi, dental anomalies, congenital scalp defects, sensorineural hearing loss, growth retardation, psychomotor retardation, hypothyroidism, imperforate anus and genitourinary anomalies. A detailed list of observed clinical features is given in Table 1.
Table 1 Clinical features of Johanson-Blizzard syndrome.
Italic letters show common features. PDA: Patent ductus arteriosus; VSD: Ventricular septal defect; ASD: Atrial septal defect.
A 5-mo-old male infant of consanguineous Yemeni parents was referred because of poor feeding. The history started when he was 2-mo old with recurrent attacks of pallor and edema in the feet and hands. In addition, the infant showed failure to thrive and greasy stools. He received 3 blood transfusions. There was a family history of two previous male siblings with the same facial features as the index case, who also received several blood transfusions and expired at 4 and 4 ½ mo, respectively
On physical examination, the patient was lethargic, hypotonic, and pale. His body weight was 3.3 kg (< 5% percentile), and body length was 52 cm (< 5% percentile). Head circumference was 37 cm (microcephaly), and the anterior fontanel was wide (6 cm × 3 cm). There was aplasia of the alae nasi, midline cutis aplasia and a small scalp defect on the occiput, the scalp hair was sparse with areas of alopecia (Figure 1), and eye lashes and eyebrows were sparse. Hypospadias was detected, and the anus was narrow and displaced anteriorly. There was also pitting edema on the feet and hands.
Figure 1 Typical facial appearance of this patient with Johanson-Blizzard syndrome, showing aplasia of alae nasi, scalp defect, and sparse hair.
Routine laboratory tests revealed the following results: hemoglobin (Hb) was 4 g/dL, with reticulocytes 7%, mean corpuscular volume 85 fl and mildly decreased platelets (75 000/μL). Erythrocyte morphology showed anisocytosis and normochromia. Hb electrophoresis and bone marrow aspiration were normal (Table 2).
Table 2 Laboratory results of the patient at 5 mo and at 9 mo of age.
At presentation (5 mo)
At 9 mo
Post transfusion: 12 g/dL,
192 000, 79 000, 100 000
150 000-400 000/mm
RBC blood morphology
Anisocytosis and normochromia
Anisocytosis and normochromia
60-170 mg L/dL
Total iron binding capacity
1260 (repeated BT)
Serum folate level
Serum vitamin B12 level
Bone marrow results (normal)
Erythropoiesis, granulopoiesis, and lymphopoiesis are normal cellularity and maturity and megakaryocytes are present
Serum pancreatic enzymes (amylase, lipase) were low. Total protein and albumin were low, and other liver function tests, renal function tests, serum electrolytes and blood sugar were within the normal range (Table 2).
Thyroid function tests revealed low free T4 and slightly increased thyroid-stimulating hormone. These results indicated hypothyroidism.
Echocardiography showed a small atrial septal defect. Whole body X-ray, abdominal ultrasound, brain computed tomography (CT) scan, and temporal bone CT scan were normal.
The patient received oral thyroxine, pancreatic enzyme replacement, multivitamins and strict monitoring to avoid complications. When the patient was seen last time at the age of 9 mo, his overall condition had significantly improved. He has gained weight, although still below the 3rd centile, and blood cell counts had normalized (Table 2). The child still showed muscular hypotonia and delay in motor milestones.
After obtaining informed written consent from the parents for the genetic investigation, venous blood samples were taken from the index patient and his parents. DNA was extracted from blood leukocytes according to standard procedures. All 47 exons of the UBR1 gene including the flanking intronic regions were analyzed by direct bidirectional sequencing as described previously. Sequencing in the index patient revealed a homozygous mutation in exon 19. The nucleotide substitution c.2089 C > T predicts a missense change (p.S700P) affecting an amino acid residue that is 100% conserved throughout vertebrate UBR1 and UBR2 proteins (Figure 2). To date, this change has not been known as a mutation or polymorphism. PolyPhen-2 (http://genetics.bwh.harvard.edu/pph2/) predicts that this mutation is probably damaging with a score of 0.992 (sensitivity: 0.59; specificity: 0.96). Both parents were found to be heterozygous for the mutation. Based on this evidence we regarded p.S700P as the disease-causing mutation in this family.
Figure 2 Demonstration and characterization of the familial mutation.
A: Comparison of electropherograms around the T > C transition at position c.2098; B: Nucleotide and amino acid sequence; C: Multiple protein alignement (http://www.ebi.ac.uk/Tools/msa/clustalw2) of vertebrate UBR1. Black shading indicates identical residues. wt: Wild-type; Hom: Homozygous; Het: heterozygous; Hs: Homo sapiens; Mm: Mus musculus; Cf: Canis familiaris; Bt: Bos taurus; Gg: Gallus gallus; Xt: Xenopus tropicalis; Dr: Danio rerio; UBR2: Human UBR2 protein.
JBS is a rare autosomal recessive disorder that affects many systems with a wide range of congenital abnormalities. A small beak-like nose (due to aplasia or hypoplasia of the alae nasi), and exocrine pancreatic insufficiency are considered the most consistent manifestations, while others features (Table 1) occur at varying frequencies in the affected patients. The patient presented here had typical facial features and exocrine pancreatic insufficiency, this combination is pathognomonic for JBS. Our patient also presented with scalp defects, developmental delay, and generalized hypotonia, which have been described in reported cases of JBS. Remarkably, our patient presented with an additional phenotypic feature, namely significant anemia, and required frequent blood transfusions from the age of 2 mo. The hematologic abnormalities also included thrombocytopenia and mild leukopenia. No definite etiology could be established. This feature has not been described in previous reports of JBS. Remarkably, two previous male siblings, who were assumed to have the same disease based on the report of similar facial features, also had significant anemia (Hb: 4 g/dL) and received frequent blood transfusions.
In addition, there was also mild to moderate thrombocytopenia in the other affected children of this family. The unusual and consistent association of JBS with a hematologic phenotype in this family may raise different speculations, such as a second autosomal recessive condition that might segregate JBS in this family or a specific function of the UBR1 protein carrying the novel missense mutation.
In infants, anemia caused by iron, vitamins and trace element deficiencies are unusual before the age of 6 mo, but in this patient the nutritional consequences of malabsorption might have appeared earlier due to many factors such as low birth weight, malnutrition in the mother and hypothyroidism in which normochromic, normocytic anemia may be secondary to reduced red blood cell production and reduced red cell survival.
Although we cannot exclude these possibilities, the fact that the hematologic disease resolved after efficient pancreatic enzyme and vitamin supplementation suggests a major contribution of malnutrition.
We thank the family for their kind cooperation.
Peer reviewer: Dr. Paul Sharp, BSc (Hons), PhD, Nutritional Sciences Division, King’s College London, Franklin Wilkins Building, 150 Stamford Street, London, SE19NH, United Kingdom
S- Editor Tian L L- Editor Webster JR E- Editor Zhang DN
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