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DNAJC3 Mutation in Thai Familial Type 2 Diabetes Mellitus

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DNAJC3 Mutation in Thai Familial Type 2 Diabetes Mellitus 1064 INTERNATIONAL JOURNAL OF MOleCular meDICine 42: 1064-1073, 2018 DNAJC3 mutation in Thai familial type 2 diabetes mellitus SIRIKUL KULANUWAT1,2, WATIP TANGJITTIPOKIN1,2, PRAPAPORN JUNGTRAKOON1,3, CHUTIMA CHANPRASERT1,2,4,5, JATUPORN SUJJITJOON1,3, NINAREEMAN BINNIMA1,2, PA-THAI YENCHITSOMANUS1,3 and NATTACHET PLENGVIDHYA1,5 1Siriraj Center of Research Excellence for Diabetes and Obesity, 2Department of Immunology, 3Division of Molecular Medicine, Department of Research and Development, 4Research Division, and 5Division of Endocrinology and Metabolism, Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand Received December 1, 2017; Accepted May 8, 2018 DOI: 10.3892/ijmm.2018.3678 Abstract. Type 2 diabetes mellitus (T2D) is a heterogeneous structure. Furthermore, the expression of DNAJC3 H238N disease, with certain cases presenting an autosomal dominant protein was 0.68±0.08 fold (P<0.05) lower when compared with type. The rare coding variants of disease-causing genes in T2D that of the wild-type, possibly due to protein instability. Thus, remain mostly unclear. The present study aimed to identify the DNAJC3 p.H238N is likely to be a variant causing diabetes. disease-causing gene conducting whole exome sequencing in a Thai T2D family with an autosomal dominant transmission of Introduction T2D with no evidence of mutations in known maturity-onset diabetes of the young (MODY) genes. Candidate variants were Diabetes mellitus (DM) is a common metabolic disorder selected according to certain criteria of mutation prediction characterized by chronic hyperglycemia. The prevalence of programs, followed by segregation analysis with diabetes DM is increasing worldwide, and the International Diabetes in the family. The results demonstrated that, of the 68,817 Federation has estimated that 592 million people will suffer variants obtained, 122 were considered as candidate variants from diabetes by 2035 (1). DM-associated chronic complica- subsequent to the filtering processes. Genotyping of these tions cause considerable morbidity and mortality (2), and variants revealed that DnaJ homolog subfamily C member 3 the treatment of these complications imposes an enormous (DNAJC3) p.H238N segregated with diabetes in the family. economic burden on healthcare systems. The most common This mutation was also identified in another proband from the form of DM is type 2 DM (T2D), accounting for 90% of cases. autosomal dominant T2D family without mutation in known It has been demonstrated that genes serve an important role MODY genes and was segregated with diabetes. This variant in the disease development by interacting with environmental was also identified in 14/1,000 older-onset T2D patients [minor factors, such as a sedentary life-style, diet and obesity (3). allele frequency (MAF)=0.007], 2/500 non-diabetic controls Although T2D typically begins in middle-aged or older indi- (MAF=0.002) and 3 prediabetic individuals who were previ- viduals, early-onset T2D at <45 years of age has been reported ously classified as non‑diabetic controls. In silico mutagenesis in several ethnic groups (4). Obesity in young adults may be one and protein modeling of p.H238N revealed changes of the of the factors driving the earlier onset of T2D (5). The inheri- polar contacts across the tetratricopeptide repeat (TPR) motif tance of a stronger genetic influence within a family is another and TPR subdomains, which may affect the protein tertiary determinant, with early-onset T2D individuals likely to have a multigenerational family history of diabetes. The most definite form of familial, autosomal dominant inheritance of diabetes is maturity-onset diabetes of the young (MODY). Typically, MODY is characterized by a young age at onset (usually prior Correspondence to: Dr Nattachet Plengvidhya, Division of Endocrinology and Metabolism, Department of Medicine, Faculty to 25 years of age) and an autosomal mode of inheritance in of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Road, multigenerational pedigrees (6). Bangkoknoi, Bangkok 10700, Thailand The identification of T2D‑causing genes will enable E-mail: [email protected] precise disease classification, leading to better treatment and prevention of the disease and its chronic complications. In Dr Watip Tangjittipokin, Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Road, 2007, there was a breakthrough in the identification of T2D Bangkoknoi, Bangkok 10700, Thailand genetic risk loci through a genome-wide association study E-mail: [email protected] (GWAS), and >100 such loci have been identified to date (7). However, several limitations of GWAS have been proposed; Key words: familial type 2 diabetes mellitus, autosomal dominant for instance, the associated single nucleotide polymorphisms inheritance, DnaJ homolog subfamily C member 3, exome sequencing fall outside coding regions. Numerous low-frequency variants have never been directly tested for an association with the trait KULANUWAT et al: DNAJC3 MUTATION IN THAI FAMILIAL T2D 1065 and they may explain only ~11% of T2D heritability (8,9). hemoglobin (HbA1c) level of ≤38 mmol/mol (5.6%), and To address this issue, current research is focusing on finding normal blood pressure. These subjects had no family history low-frequency to rare variants with intermediate to large of diabetes among their first‑degree relatives. effects that are associated with diabetes (10). Recent advances in nucleic acid sequencing by next-generation sequencing Ethical approval and consent to participate. All subjects technology have facilitated the identification of genes causing were informed of the purpose of the study prior to signing diseases (10). Furthermore, whole-exome sequencing (WES) an informed consent form. The entire study was approved by has led to the successful discovery of mutations between rare the Ethics Committee, Faculty of Medicine, Siriraj Hospital, coding variants and T2D (11,12). Mahidol University (COA no. Si491/2014), and was conducted Thus, the aim of the present study was to identify rare according to the Declaration of Helsinki, the Belmont Report, variant causing diabetes in Thai T2D families. Through the Council for International Organizations of Medical Sciences application of WES, the study identified the causative variant Guidelines and the International Conference on Harmonization in a large family with autosomal dominant T2D in which a in Good Clinical Practice. proband developed T2D at an early age. Exome sequencing. DNA samples of 2 diabetic and Materials and methods 2 non-diabetic family members were subjected to exome sequencing. Exome capture was performed using the Agilent Diabetes families. Diabetes families were recruited at the SureSelect Human All Exon 50 Mb kit (Agilent Technologies, Diabetic Clinic, Siriraj Hospital, Mahidol University (Bangkok, Inc., Santa Clara, CA, USA) according to the manufacturer's Thailand) using the following criteria: i) The proband and at protocol. The captured library was then loaded onto the least one first‑degree relative were diagnosed with diabetes Illumina HiSeq 2000 platform (Illumina, Inc., San Diego, before the age of 35 years; ii) two or more generations were CA, USA) for amplifying and sequencing. The sequence affected by diabetes; iii) glycemic control could be accom- reads were mapped to the reference human genome (UCSC plished with diet and/or oral agents; iv) there was no history NCBI37/hg19) using the Burrows-Wheeler Aligner (15). of diabetic ketoacidosis; and v) the proband was negative Variant detections and annotations were performed by for anti-glutamic acid decarboxylase antibody. A total of 91 SAMtools (16) and the Genome Analysis Toolkit (17), respec- autosomal dominant diabetes families were recruited between tively. Variants with low quality scores and those covered by January 2009 and 2017, 42 of whom fitted into the classic <5 reads were excluded. MODY criteria, characterized by early age of onset (usually before 25 years) and autosomal mode of inheritance in multi- Candidate variant selection. Candidate variants were selected generational pedigree (13). The selected family was a large using an autosomal dominant mode of inheritance according family composed of 17 members (Fig. 1A; Table I), in which to the following criteria: i) Variants identified only in diabetic the proband and third generation family members developed subjects; ii) heterozygous, non-synonymous variants with a minor diabetes at a young age of <35 years, and diabetes had been allele frequency (MAF) of <0.01 were selected from the 1000 transmitted through three generations. This selected family did Genome Project (http://www.1000genomes.org/), the National not fit classic MODY criteria and was one of the 49 early‑onset Institute of Environmental Health Sciences Exome Project T2D families. The proband and her first degree relative were (http://evs.gs.washington.edu/niehsExome/) and the dbSNP147 diagnosed with diabetes before 35 years of age and the diabetes database from UCSC Genome Browser Gateway (http://genome. was transmitted in an autosomal dominant fashion. Mutations ucsc.edu/cgi-bin/hgGateway?hgsid=662106975_rQ8ylYRLVt- of 14 known MODY genes [HNF4A (MIM: 600281), GCK bw0NVxwJnh1AhFhb5S& redirect=manual&source=genome. (MIM: 138079), HNF1A (MIM: 142410), PDX1(MIM: ucsc.edu); and iii) variants predicted by at least one out of four 600733), HNF1B (MIM: 189907), NEUROD1 (MIM: 601724), in silico programs
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