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A New Patient of Chanarin Dorfman Syndrome in Egypt

Article Information

Zeinab el kabbany1, Ola khalifa2, Asmaa Wafeeq1*, Khushnooda Ramzan3, Lina Al Baik3, Faiqa Imtiaz3, Yasser Wageeh4, Khaled Zalata5, Alaa Mousa1

1Department of Paediatric Hepatology, Faculty of medicine, Ain Shams University, Cairo, Egypt

2Department of Genetics, Faculty of medicine, Ain Shams University, Cairo, Egypt

3Department of Genetics, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia

4Department of Clinical Pathology, Ain Shams University, Cairo, Egypt

5Department of Pathology, Mansoura University, Mansoura, Dakahlia, Egypt

*Corresponding Author: Dr. Asmaa Wafeeq, Department of Paediatric Hepatology, Faculty of medicine, Ain Shams University, Cairo, Egypt

Received: 11 Sep 2019; Accepted: 08 October 2019; Published: 29 November 2019

Citation: Zeinab el kabbany, Ola khalifa, Asmaa Wafeeq, Khushnooda Ramzan, Lina Al Baik, Faiqa Imtiaz, Yasser Wageeh, Khaled Zalata, Alaa Mousa. A New Patient of Chanarin Dorfman Syndrome in Egypt. Archives of Clinical and Medical Case Reports 3 (2019): 702-707.

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Abstract

Chanarin Dorfman syndrome (CDS) is an autosomal recessive neutral lipid storage disorder characterized by ichthyosis, and multisystem affection. Here, we report another patient from Egypt. The clinical data from a patient and his family were collected. DNA was isolated from peripheral blood leukocytes. Coding exons and the flanking introns of ABHD5 gene were PCR amplified, purified, and sequenced. Our patient meets the major clinical symptoms of CDS. Direct sequencing of ABHD5 gene led to the identification of a homozygous single nucleotide change (c.700C>T) in our patient. The parents were both heterozygous carriers, while his sister was wild type normal for the identified variant. In conclusion, these results indicate that p.Arg234Ter is a pathogenic mutation associated with the Chanarin-Dorfman syndrome in our patient in this study.

Keywords

Chanarian-Dorfman syndrome; Cytoplasmic vacuoles; Gene mutation; ABHD5 gene

Chanarian-Dorfman syndrome articles, Cytoplasmic vacuoles articles, Gene mutation articles, ABHD5 gene articles

Article Details

Abbreviations:

CDS-Chanarian-Dorfman syndrome

1. Introduction

Chanarin -Dorfman syndrome (CDS) is an autosomal recessive neutral lipid storage disorder, which is characterized by congenital ichthyosis, lipid vacuoles in peripheral leucocytes, and multisystem affection [1]. At birth, affected individuals usually present with dry, scaly skin. Additional features include hepatomegaly, ataxia, hearing loss, short stature, muscle weakness, nystagmus, and mild intellectual disability [2]. This condition is caused by mutations in the ABHD5 which is broadly expressed in different tissues, including skeletal muscle, lymphocytes, skin, liver, and brain. Therefore, any impairment in ABDH5 expression may lead to many complications in various tissues [3]. We have reported previously a patient from Egypt in 2003, and here we present another patient of CDS from Egypt.

2. Subjects and Methods

2.1 Demographic and clinical data

A 15-month-old male presented with generalized erythematous scaling since birth, with no bullous lesions, associated with gradual abdominal swelling. There was no history of visual, hearing or any focal neurological deficits. He was the first child of first cousin consanguineous marriage, with no previous pregnancy loss and no other family member had been similarly affected. Skin examination revealed generalized erythematous fine scaly patches with peeling of hands and trunk (Figure 1A). On examination of his abdomen a 10 cm firm, non tender hepatomegaly was found. The nervous system examination was normal. His anthropometric measurements (length-for-age, weight-for-age, head circumference-for-age, and weight-for-length) were all below the third percentile according to the CDC (Centre for Disease Control) growth charts. A small ASD was discovered accidentally during his echocardiographic examination. Complete blood film, liver functions, lipid profile, liver biopsy, bone marrow aspiration was done for the affected child and genetic testing was ordered for the boy and his family

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Figure 1: Clinical findings and investigations of the patient. A: generalized erythematous fine scaly patches associated with peeling of hands and trunk. B: the peripheral smear shows leucocytic vacuolations in the neutrophils (Jordan's anomaly). C: The electron microscopic examination shows the excess number of non membrane bound lipid droplets in the hepatocytes.

2.2 Genotyping

Following informed consent, blood samples were taken from the index case (II:1), healthy parents (I:1 and I:2) and healthy sister (II:2, Figure 2A). DNA was isolated from peripheral blood leukocytes. Coding exons and the flanking introns of ABHD5 genes (GenBank sequence accession numberNM_016006.5) were PCR amplified by primer pairs designed by using Primer3 v.0.4.0 program (http://bioinfo.ut.ee/primer3-0.4.0, then PCR was purified and sequenced with ABI PRISM Big Dye Terminator v3.1 Cycle Sequencing Kit on an ABI PRISM 3730 automated DNA Analyzer (Applied Biosystems, Inc., Foster City, CA, USA). Sequence analysis was performed using Laser gene (DNA Star Inc., Madison, WI, USA) software package, and then compared to the standard sequence.

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Figure 2: (A) Pedigree of the families studied with Chanarin-Dorfman syndrome demonstrating the recessive inheritance pattern. Filled symbols indicate affected individual. (B) Identification of a mutation in ABHD5. Sequencing chromatogram indicates the homozygous wild type, homozygous mutant and heterozygous carrier forms. Homozygous c.700C>T (p.Arg234Ter) mutation is identified in our patient (II:1). Nucleotide and amino acid numbering correspond to NM_016006.5 for the cDNA and NP_057090.2 for the protein. Nucleotides were numbered using the A of the ATG translation initiation codon as +1 nucleotide of the coding sequence.

3. Results and Analysis

On investigation, complete blood counts showed mild normocytic normochromic anemia and the peripheral smear showed leucocytic vacuolations in the neutrophils (Jordan's anomaly) that became clear on Giemsa-Wright staining (Figure 1B). Regarding liver functions tests, there was mildly elevated alanine aminotransferase (51 IU/L) with normal serum albumin, bilirubin and INR. Lipid profile was normal including serum triglycerides (72 mg) and serum cholesterol (171 mg). Creatine phosphokinase was normal. His ultrasound abdomen revealed coarse bright hepatomegaly. The light microscopic examination of his liver biopsy showed micronodular cirrhosis with macrovesicular steatosis and steatohepatitis with bridging fibrosis, while the electron microscopic analysis of his biopsy showed that the hepatocytes contained an excess number of non membrane bound lipid droplets (Figure 1C). Also, his bone marrow examination showed normocellular marrow with vacuolated myeloid series.

Direct sequencing of ABHD5 gene led to the identification of a homozygous single nucleotide change (c.700C>T) in the index case (II:1 from pedigree, Figure 2A). At the protein level, this transition introduced a stop codon at amino acid position 234 (p.Arg234Ter) (Figure 2B). In order to confirm this mutation and to examine its segregation through the family, Sanger sequencing was performed for the parents and sibling who were all healthy and show no signs or symptoms related to the disorder. The parents were both heterozygous carriers, while his sister was wild type normal for the identified variant.

4. Discussion

Chanarin- Dorfman syndrome (CDS) is one of the Neutral lipid storage diseases (NLSDs) characterized by an impairment in the triacylglycerol degradation and its abnormal accumulation in cytoplasmic lipid droplets present in most tissues [4]. Our patient meets the major clinical symptoms of CDS, which are non-bullous congenital ichthyosiform erythroderma [5], hepatomegaly and liver steatosis [6]. Clinical evidence of myopathy usually appears late [7] which could explain that our patient doesn’t have clinical muscle affection, supported by normal CPK. Also, he doesn’t have any neurological impairment, ataxia, nystagmus, or neurosensory deafness; these are late manifestations of the disease as triglyceride storage does not affect the central nervous system before middle age [8]. Hepatic involvement is known to be variable in CDS and liver biopsy is of great importance in reaching a diagnosis. Although our patient had liver function tests within normal range except for slightly elevated ALT, liver biopsy showed steatosis, in addition to the characteristic lipid droplets. The liver is clinically affected in 64% of CDS patients; however the increased liver enzymes and histological steatohepatitis are found in the 100% CDS patients with or without hepatomegaly [9].

Serum lipid pro?le has been inconsistent in various reports. Some patients had elevated triglyceride levels and very low density lipoproteins [10], while our patient had normal serum triglycerides similar to what was previously reported by [4, 11]. The clinical diagnosis of CDS is based on observation of Jordans’ bodies [12], which is also described in our patient’s peripheral neutrophils and their myeloid precursors in bone marrow.

Apart from the features described above, our patient had a congenital heart disease (ASD) which is an association not reported before with CDS. The identified homozygous stop gain, mutation (p.Arg234Ter) inABHD5gene, which encodes for Abhydrolase Domain-Containing protein, is predicted to result in a premature stop codon and an extremely truncated protein. To date, there are 38 different mutations in ABHD5, which cause Chanarin-Dorfman syndrome (The Human Gene Mutation Database, HGMD; http://www.hgmd.cf.ac.uk/). The variant mutation identified in our study (HGMD: CM052822) has been previously reported [13].

5. Conclusion

Collectively, these results indicate that p.Arg234Ter is pathogenic mutation associated with the Chanarin-Dorfman syndrome found in our patient in this study.

Authors’ Contributions

Dr. Zeinab el kabbany contributed to the acquisition of data and clinical followup. Dr. Asmaa Wafeeq contributed to the analysis and interpretation of data, clinical follow up and editing the manuscript. Dr. ­Ola Khalifa, Dr. Khushnooda Ramzan, Dr. Lina Al Baik, Dr. Faiqa Imtiaz performed the molecular studies and contributed to the interpretation of the results, and editing of the manuscript. Dr. Yasser, Dr. Khaled performed the histo-pathological investigations and Dr. Alaa contributed to clinical evaluation of the patient.

Compliance with Ethical Standards

The study was approved by the Institutional ethical committee of Ain Shams University Hospital, Egypt.

Financial Disclosure

No financial relationships relevant to this article.

Informed Consent

Written informed consent was obtained from the parent of the participating children.

Conflicts of Interest

All the authors declare that they have no conflicts of interest.

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