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A case report of novel mutation in PRF1 gene, which causes familial autosomal recessive hemophagocytic lymphohistiocytosis

Abstract

Background

Hemophagocytic Lymphohistiocytosis (HLH) is a life-threatening immunodeficiency and multi-organ disease that affects people of all ages and ethnic groups. Common symptoms and signs of this disease are high fever, hepatosplenomegaly, and cytopenias. Familial form of HLH disease, which is an autosomal recessive hematological disorder is due to disease-causing mutations in several genes essential for NK and T-cell granule-mediated cytotoxic function. For an effective cytotoxic response from cytotoxic T lymphocyte or NK cell encountering an infected cell or tumor cell, different processes are required, including trafficking, docking, priming, membrane fusion, and entry of cytotoxic granules into the target cell leading to apoptosis. Therefore, genes involved in these steps play important roles in the pathogenesis of HLH disease which include PRF1, UNC13D (MUNC13-4), STX11, and STXBP2 (MUNC18-2).

Case presentation

Here, we report a novel missense mutation in an 8-year-old boy suffered from hepatosplenomegaly, hepatitis, epilepsy and pancytopenia. The patient was born to a first-cousin parents with no previous documented disease in his parents. To identify mutated gene in the proband, Whole Exome Sequencing (WES) utilizing next generation sequencing was used on an Illumina HiSeq 2000 platform on DNA sample from the patient. Results showed a novel deleterious homozygous missense mutation in PRF1 gene (NM_001083116: exon3: c. 1120 T > G, p.W374G) in the patient and then using Sanger sequencing it was confirmed in the proband and his parents. Since his parents were heterozygous for the identified mutation, autosomal recessive pattern of inheritance was confirmed in the family.

Conclusions

Our study identified a rare new pathogenic missense mutation in PRF1 gene in patient with HLH disease and it is the first report of mutation in PRF1 in Iranian patients with this disease.

Peer Review reports

Background

Hemophagocytic lymphohistiocytosis (HLH) is an uncommon hyper-inflammatory syndrome with high mortality associated with different conditions, including neoplastic, infectious, autoimmune, or hereditary diseases [1]. Neuropathologic findings and neurologic symptoms have been identified approximately in 75% of pediatric cases, including seizures, meningitis, encephalopathy, ataxia, hemiplegia, cranial nerve palsies, mental status changes, or simply irritability [2]. In magnetic resonance imaging (MRI) studies some brain findings may be observed, which include the increase of nodular parenchymal lesions, leptomeningeal enhancement, demyelization, and atrophy [3]. The incidence of HLH has been estimated to be 1 to 225 per 300 000 live births and is reported in all ages, races and both genders [1, 2, 4]. HLH is grouped into two forms, which include familial type due to genetic mutations affecting the cytotoxic function of T lymphocytes and natural killer (NK) cells or acquired form presenting in different conditions such as infectious, malignant, rheumatologic, or metabolic diseases [1, 5]. HLH is a medical emergency and must be suspected in patients affected by unexplained cytopenias and fever at any age [6]. There are no any gold standard confirmatory laboratory tests for HLH, which makes it difficult to confirm the disorder in patients. This is due to the fact that laboratory testing can show false negative results and lack specificity, or may take times to perform the tests which are not useful in a clinical emergency [7].

The diagnostic criteria for acquired HLH include fever; cytopenias affecting at least 2 of 3 lineages in the peripheral blood; splenomegaly; hyperferritinemia; hemophagocytosis in the bone marrow, spleen, or lymph nodes; hypertriglyceridemia and/or hypofibrinogenemia; low or absent NK-cell activity determined by the 51-Cr release assay; and high levels of sCD25. Five of these eight criteria are essential for diagnosis of acquired HLH, but in familial cases with a known genetic abnormality (FHL with mutations), the diagnosis can be conducted without consideration of these five criteria [8–10]. Five different forms of FHL have been described based on defects in different genetic material and genes, including chromosome arm 9q mutations (FHL1), PRF1 (FHL2), UNC13D (MUNC13-4) (FHL3), STX11 (FHL4), and STXBP2 (MUNC18-2) (FHL5) [11–17]. To date, several mutations have been reported across exons and exon-intron boundaries of these genes. Therefore, mutation screening for HLH is complicated. However, molecular genetic approaches using next generation sequencing can be very useful in identification of familial cases suspected for HLH. Therefore, the purpose of this study was to identify disease causing mutation in a boy diagnosed with HLH.

Case presentation

An 8-year-old boy was admitted to the hematology department in Namazi Hospital (Shiraz, Iran) due to clinical findings such as fever, jaundice, hepatosplenomegaly, and pancytopenia. Laboratory studies showed notable abnormal findings related to liver function tests and coagulation profile. He had an increased level of AST, ALT, LDH, total and direct bilirubin, prolonged prothrombin time (PT), and activated partial thromboplastin time (aPTT), serum ferritin (nearly 1000 ng/ml), and low level of fibrinogen, total protein, and albumin. A high titer of Ebstein-Barr virus (EBV) viral capsid antigen IgM antibody proved an acute EBV infection. Serological markers for hepatitis A, B, and C were negative, and antibody titers for autoimmune hepatitis were within normal range. Moreover, Wilson disease was ruled out by measuring serum ceruloplasmin and 24-h urine copper. Liver biopsy and bone marrow aspiration followed by biopsy was inconclusive with non-specific findings. Laboratory tests such as defective killing activity of either CD8 or NK cells, were not available in our center or elsewhere in Iran.

The proband was product of consanguineous marriage (first-degree cousins) and there were no any documented HLH disease phenotype, immune disorders, hepatic diseases and blood malignancies in the immediate and extended family. The patient was suspected as a case of HLH according to HLH-2004 protocol [9] given the fact that he fulfilled the necessary criteria mentioned above. He was treated with dexamethasone, cyclopsporin and etoposide, but soon after starting treatment he showed dramatic responses with resolution of fever and correction of hepatitis, pancytopenia and bleeding tendency. Gradually, the patient developed clinical signs of the central nervous system (CNS) involvements such as convulsion, ataxia, spasticity and slurred speech. But cerebral spinal fluid (CSF) analysis for cell count, protein and cytology were normal. Brain MRI with and without contrast injection revealed spots of white matter hypersignal intensities on T2 and FLAIR images which were in favor of CNS involvement in HLH [18] (Fig. 1). Thus, we added intrathecal methotrexate and hydrocortisone to his treatment regimen, and searched for an HLA-matched donor for BM transplantation.

Fig. 1
figure 1

a, b, c and d Axial Flair sequences of brain MRI, which reveal numerous variable size and irregular shape hypersignal areas involving cerebral hemispheres, cerebellar hemispheres, pones and cerebral peduncles, mostly located in the corticomedullary junction and deep white matter in favor of HLH CNS involvement

To determine whether the patient is a case of familial HLH, an unbiased next generation DNA sequencing which covered the entire coding exons was performed for detection of mutation in genes involved in FHL. We performed whole exome sequencing utilizing next generation sequencing on an Illumina platform on DNA sample from the patient. Detail of sample alignment is listed in Table 1. The text files of sequences were aligned using BWA aligner tool and variants were identified using GATK and annotated with the use of annovar software. In total, more than 120 K annotated variants were identified with hetero/homo ratio of 1.7, which then were filtered based on their frequency, location, functional consequences, inheritance pattern and more importantly clinical phenotype. Results revealed a novel homozygous missense mutation in PRF1 gene (NM_001083116: exon3, c.1120 T > G, p.W374G, position 72,358,357 on chromosome 10). Homozygous mutations in PRF1 gene, which is encoded for perforin 1, have been previously reported to cause type-2 of familial HLH, (OMIM number 603553) [19], having an autosomal recessive pattern of inheritance. Using Sanger sequencing, the new identified mutation was confirmed in the proband (as homozygote mutation) and his parents (as heterozygote mutation) (Fig. 2). This mutation has not previously been reported and this is the first report of mutation of PRF1 gene in Iranian patients affected by HLH. Following evidences confirm that this mutation can lead to FHL2: 1-Whole exome sequencing only identified this mutation to be the main cause of FHL2 in the patient. 2- As can be seen in Fig. 2, Sanger sequencing confirmed the mutation in the proband and based on identified heterozygote mutation in his parents, the inheritance pattern must be an autosomal recessive. 3- Bioinformatics software such as polyphen, SIFT, LRT, Mutation Taster, FATHMM, Radial SVM and Mutation Assessor software are predicted that this variant will be damaging (Table 2) 4- As shown in Fig. 3, the comparative amino acids alignment of perforin 1 protein across all Kingdoms using multiple sequence alignment analysis using T-Coffee Multiple Sequence Alignment Program revealed that this amino acid is highly conserved during evolution. 5. In addition, a substitution from tryptophan amino acid with an aromatic side chain (at position 374) to glycine amino acid with a nonpolar and small hydrogen side chain can create major problem in the protein. Thus, this mutation in PRF1 gene is extremely pathogenic in our patient with FHL2.

Table 1 Whole exome sequencing detail of coverage and number of reads
Fig. 2
figure 2

The proband is a boy with hepatitis and pancytopnea and his parents has consanguineous marriage. NGS results indicate homozygous mutation in PRF1 gene in the proband as visualized using Integrative Genome Viewer (IGV) and using Sanger sequencing presence of the identified heterozygous mutation in PRF1 gene was confirmed in the parents

Table 2 Bioinformatic analysis of new identified mutation (p.W374G) in PRF1 gene in the proband
Fig. 3
figure 3

Comparative amino acids alignment of perforin protein across all Kingdoms. The W374 residue is highly conserved during evolution. The conserved tryptophan residue is shown in the rectangular box. Protein sequences were obtained from National Center for Biotechnology (NCBI). Symbols: (*)—identical amino acids; (:) — just similar amino acids

Discussion

PRF1 which is located on the long arm of the chromosome 10 (10q22.1) is coded for perforin 1 that is functionally and structurally similar to complement component 9 (C9) involved in the complement system. Both proteins produce transmembrane tubules and able to lyse non-specifically various target cells. Perforin 1 is one of the essential cytolytic proteins of cytolytic granules, and it is well recognized to be a major effector molecule for T-cell- and natural killer-cell-mediated cytolysis. It has an important role in killing the "non-self" targets recognized by the immune system, for instance, in transplant rejection or some autoimmune diseases [20]. It plays a key role in secretory granule-dependent cell death, and in defense against virus-infected or neoplastic cells [12, 21, 22, 23]. Since the gene product is involved in killing virus-infected cells and it was impaired in our patient, his EBV infection might be due to the defect of this gene.

Mutations and variants in PRF1 gene are also documented in other disorders which include perforin deficiency [24], multiple sclerosis [25], type 1 diabetes [26], Non-Hodgkin lymphoma, and leukemia [27, 28]. Up to now, more than 115 pathogenic gene variants have been reported in this gene, mainly missense and nonsense mutations. In general, severity of the disease depends on the residual activity of the perforin [29, 30].

PRF1 mutations are responsible for approximately 20% of familial cases of HLH, with high frequencies in North America (approximately 50%), Japan (40%), and Turkey (30% [17, 31]. FHL2 is clinically characterized by fever, edema, hepatosplenomegaly, and liver dysfunction. In addition, neurologic impairment, seizures, and ataxia are frequent in this type [32]. It has been reported that laboratory studies can show pancytopenia, coagulation abnormalities, hypofibrinogenemia, and hypertriglyceridemia [33]. However, with advances in sequencing technologies, the disease is more readily detectable and secondary prevention for families become accessible. Although heterozygous carriers are not apparently sick, they are at risk of passing this deleterious mutation into their offspring. Therefore, PRF1 genetic test must be requested for individuals with abnormalities suspected for HLH and should be offered to family members of known patients who intend to have consanguineous marriage. Since there is a high rate of monogenic disorders in Iran, particularly in rural areas where first-degree marriages are more common, finding and reporting rare novel pathogenic mutations would be extremely important for subsequent prevention of inherited disorders with homozygous pattern of inheritance.

Early molecular diagnosis and initiation of treatment for familial type-2 HLH is lifesaving [34]. In addition to the prevention of new cases of inherited disease in families with consanguineous marriages, identification of novel disease-causing mutations can provide proper molecular diagnosis of HLH, which will help to consider more reliable therapeutic approaches. While there is no cure for the HLH disease, recent advances regarding other monogenic disorders have provided several potential therapeutic options which include gene therapy, cell therapy, enzyme replacement therapy and bone marrow transplant. Symptomatic and supportive treatments for the hepatic and neurological abnormalities are the current available options, but do not significantly change the clinical course and outcome. Allogeneic hematopoietic stem cell transplantation is recommended and frequently used with promising outcomes [35]. Future therapies with the use of patient-derived iatrogenic pluripotent stem cells (iPSCs) [36], combined with CRISPR/CAS9 gene editing techniques [37] might help generate hematopoietic stem cell autograph transplantation.

However, with the limited available therapeutic option for most of the HLH patients, molecular diagnosis might enable geneticists and pediatricians to provide informative genetic counseling, perform prenatal diagnosis, and implement prevention measures for such patients. Therefore, genetic counseling should be recommended to all individuals with HLH disease and families for their next pregnancies and for other family members who want to have consanguineous marriages.

Conclusions

In summary, a rare pathogenic mutation in PRF1 gene was identified in our patient with FHL2 disorder, proving the link between PRF1 gene mutations, hepatitis, neurologic manifestations, and pancytopenia in patients with HLH. Our study may help to establish an appropriate genetic counselling and prenatal diagnosis for individuals at the high risk of HLH disorder.

Abbreviations

ALT:

Alanine transaminase

APTT:

Activated partial thromboplastin time

AST:

Aspartate transaminase

CNS:

Central nervous system

CSF:

Cerebral spinal fluid

EBV:

Epstein-Barr virus

FHL:

Familial Hemophagocytic Lymphohistiocytosis

HLH:

Hemophagocytic Lymphohistiocytosis

iPSCs:

Iatrogenic pluripotent stem cells

LDH:

Lactate dehydrogenase

MRI:

Magnetic resonance imaging

PRF1 :

Perforin 1

PT:

Prothrombin time

References

  1. Janka GE. Familial and acquired hemophagocytic lymphohistiocytosis. Annu Rev Med. 2012;63:233–46.

    Article  CAS  PubMed  Google Scholar 

  2. Henter JI, Elinder G, Soder O, Ost A. Incidence in Sweden and clinical features of familial hemophagocytic lymphohistiocytosis. Acta Paediatr Scand. 1991;80(4):428–35.

    Article  CAS  PubMed  Google Scholar 

  3. Gurgey A, Aytac S, Balta G, Oguz KK, Gumruk F. Central nervous system involvement in Turkish children with primary hemophagocytic lymphohistiocytosis. J Child Neurol. 2008;23(11):1293–9.

    Article  PubMed  Google Scholar 

  4. Ishii E, Ohga S, Tanimura M, Imashuku S, Sako M, Mizutani S, Miyazaki S. Clinical and epidemiologic studies of familial hemophagocytic lymphohistiocytosis in Japan. Japan LCH study group. Med Pediatr Oncol. 1998;30(5):276–83.

    Article  CAS  PubMed  Google Scholar 

  5. Gurgey A, Gogus S, Ozyurek E, Aslan D, Gumruk F, Cetin M, Yuce A, Ceyhan M, Secmeer G, Yetgin S, et al. Primary hemophagocytic lymphohistiocytosis in Turkish children. Pediatr Hematol Oncol. 2003;20(5):367–71.

    Article  CAS  PubMed  Google Scholar 

  6. Janka G. Hemophagocytic lymphohistiocytosis: when the immune system runs amok. Klin Padiatr. 2009;221(5):278–85.

    Article  CAS  PubMed  Google Scholar 

  7. Rosado FG, Kim AS. Hemophagocytic lymphohistiocytosis: an update on diagnosis and pathogenesis. Am J Clin Pathol. 2013;139(6):713–27.

    Article  CAS  PubMed  Google Scholar 

  8. Henter JI, Elinder G, Ost A. Diagnostic guidelines for hemophagocytic lymphohistiocytosis. The FHL study group of the histiocyte society. Semin Oncol. 1991;18(1):29–33.

    CAS  PubMed  Google Scholar 

  9. Henter JI, Horne A, Arico M, Egeler RM, Filipovich AH, Imashuku S, Ladisch S, McClain K, Webb D, Winiarski J, et al. HLH-2004: diagnostic and therapeutic guidelines for hemophagocytic lymphohistiocytosis. Pediatr Blood Cancer. 2007;48(2):124–31.

    Article  PubMed  Google Scholar 

  10. Janka GE, Schneider EM. Modern management of children with haemophagocytic lymphohistiocytosis. Br J Haematol. 2004;124(1):4–14.

    Article  PubMed  Google Scholar 

  11. Voskoboinik I, Smyth MJ, Trapani JA. Perforin-mediated target-cell death and immune homeostasis. Nat Rev Immunol. 2006;6(12):940–52.

    Article  CAS  PubMed  Google Scholar 

  12. Stepp SE, Dufourcq-Lagelouse R, Le Deist F, Bhawan S, Certain S, Mathew PA, Henter JI, Bennett M, Fischer A, de Saint BG, et al. Perforin gene defects in familial hemophagocytic lymphohistiocytosis. Science. 1999;286(5446):1957–9.

    Article  CAS  PubMed  Google Scholar 

  13. Feldmann J, Callebaut I, Raposo G, Certain S, Bacq D, Dumont C, Lambert N, Ouachee-Chardin M, Chedeville G, Tamary H, et al. Munc13-4 is essential for cytolytic granules fusion and is mutated in a form of familial hemophagocytic lymphohistiocytosis (FHL3). Cell. 2003;115(4):461–73.

    Article  CAS  PubMed  Google Scholar 

  14. zur Stadt U, Rohr J, Seifert W, Koch F, Grieve S, Pagel J, Strauss J, Kasper B, Nurnberg G, Becker C, et al. Familial hemophagocytic lymphohistiocytosis type 5 (FHL-5) is caused by mutations in Munc18-2 and impaired binding to syntaxin 11. Am J Hum Genet. 2009;85(4):482–92.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  15. zur Stadt U, Schmidt S, Kasper B, Beutel K, Diler AS, Henter JI, Kabisch H, Schneppenheim R, Nurnberg P, Janka G, et al. Linkage of familial hemophagocytic lymphohistiocytosis (FHL) type-4 to chromosome 6q24 and identification of mutations in syntaxin 11. Hum Mol Genet. 2005;14(6):827–34.

    Article  PubMed  Google Scholar 

  16. Cote M, Menager MM, Burgess A, Mahlaoui N, Picard C, Schaffner C, Al-Manjomi F, Al-Harbi M, Alangari A, Le Deist F, et al. Munc18-2 deficiency causes familial hemophagocytic lymphohistiocytosis type 5 and impairs cytotoxic granule exocytosis in patient NK cells. J Clin Invest. 2009;119(12):3765–73.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  17. Gholam C, Grigoriadou S, Gilmour KC, Gaspar HB. Familial haemophagocytic lymphohistiocytosis: advances in the genetic basis, diagnosis and management. Clin Exp Immunol. 2011;163(3):271–83.

    Article  CAS  PubMed  PubMed Central  Google Scholar 

  18. Guandalini M, Butler A, Mandelstam S. Spectrum of imaging appearances in Australian children with central nervous system hemophagocytic lymphohistiocytosis. J Clin Neurosci. 2014;21(2):305–10.

    Article  PubMed  Google Scholar 

  19. Madkaikar M, Gupta M, Dixit A, Patil V. Predominant Neurological Manifestations Seen in a Patient With a Biallelic Perforin1 Mutation (PRF1; p.R225W). J Pediatr Hematol Oncol. 2016;39(2):143-146.

  20. Yang SL, Xu XJ, Tang YM, Song H, Xu WQ, Zhao FY, Shen DY. Associations between inflammatory cytokines and organ damage in pediatric patients with hemophagocytic lymphohistiocytosis. Cytokine. 2016;85:14–7.

    Article  CAS  PubMed  Google Scholar 

  21. Dotiwala F, Mulik S, Polidoro RB, Ansara JA, Burleigh BA, Walch M, Gazzinelli RT, Lieberman J. Killer lymphocytes use granulysin, perforin and granzymes to kill intracellular parasites. Nat Med. 2016;22(2):210–6.

    Article  CAS  PubMed  Google Scholar 

  22. Zhou F. Perforin: more than just a pore-forming protein. Int Rev Immunol. 2010;29(1):56–76.

    Article  PubMed  Google Scholar 

  23. Menasche G, Feldmann J, Fischer A, de Saint BG. Primary hemophagocytic syndromes point to a direct link between lymphocyte cytotoxicity and homeostasis. Immunol Rev. 2005;203:165–79.

    Article  CAS  PubMed  Google Scholar 

  24. Tesi B, Chiang SC, El-Ghoneimy D, Hussein AA, Langenskiold C, Wali R, Fadoo Z, Silva JP, Lecumberri R, Unal S, et al. Spectrum of atypical clinical presentations in patients with biallelic PRF1 missense mutations. Pediatr Blood Cancer. 2015;62(12):2094–100.

    Article  CAS  PubMed  Google Scholar 

  25. Camina-Tato M, Morcillo-Suarez C, Bustamante MF, Ortega I, Navarro A, Muntasell A, Lopez-Botet M, Sanchez A, Carmona P, Julia E, et al. Gender-associated differences of perforin polymorphisms in the susceptibility to multiple sclerosis. J Immunol. 2010;185(9):5392–404.

    Article  CAS  PubMed  Google Scholar 

  26. Orilieri E, Cappellano G, Clementi R, Cometa A, Ferretti M, Cerutti E, Cadario F, Martinetti M, Larizza D, Calcaterra V, et al. Variations of the perforin gene in patients with type 1 diabetes. Diabetes. 2008;57(4):1078–83.

    Article  CAS  PubMed  Google Scholar 

  27. Mhatre S, Madkaikar M, Jijina F, Ghosh K. Unusual clinical presentations of familial hemophagocytic lymphohistiocytosis type-2. J Pediatr Hematol Oncol. 2014;36(8):e524–527.

    Article  CAS  PubMed  Google Scholar 

  28. Mhatre S, Madkaikar M, Desai M, Ghosh K. Spectrum of perforin gene mutations in familial hemophagocytic lymphohistiocytosis (FHL) patients in India. Blood Cells Mol Dis. 2015;54(3):250–7.

    Article  CAS  PubMed  Google Scholar 

  29. Ishii E, Ohga S, Imashuku S, Kimura N, Ueda I, Morimoto A, Yamamoto K, Yasukawa M. Review of hemophagocytic lymphohistiocytosis (HLH) in children with focus on Japanese experiences. Crit Rev Oncol Hematol. 2005;53(3):209–23.

    Article  PubMed  Google Scholar 

  30. Zhang K, Filipovich AH, Johnson J, Marsh RA, Villanueva J. Hemophagocytic Lymphohistiocytosis, Familial. In: Pagon RA, Adam MP, Ardinger HH, Wallace SE, Amemiya A, Bean LJH, Bird TD, Fong CT, Mefford HC, Smith RJH, et al. editiors. GeneReviews (R). Seattle: University of Washington, Seattle; 1993-2017. 2006 Mar 22 [updated 2013 Jan 17].

  31. Morimoto A, Nakazawa Y, Ishii E. Hemophagocytic lymphohistiocytosis: pathogenesis, diagnosis, and management. Pediatr Int. 2016;58:817.

    Article  CAS  PubMed  Google Scholar 

  32. Ishii E. Hemophagocytic lymphohistiocytosis in children: pathogenesis and treatment. Front Pediatr. 2016;4:47.

    Article  PubMed  PubMed Central  Google Scholar 

  33. Hayden A, Park S, Giustini D, Lee AY, Chen LY. Hemophagocytic syndromes (HPSs) including hemophagocytic lymphohistiocytosis (HLH) in adults: a systematic scoping review. Blood Rev. 2016;30:411.

    Article  PubMed  Google Scholar 

  34. Yasumi T, Shibata H, Shimodera S, Heike T. [Heterogeneity of HLH pathophysiology and treatment strategies]. Rinsho Ketsueki. 2015;56(10):2248–57.

    PubMed  Google Scholar 

  35. Jiang MY, Guo X, Sun SW, Li Q, Zhu YP. Successful allogeneic hematopoietic stem cell transplantation in a boy with X-linked inhibitor of apoptosis deficiency presenting with hemophagocytic lymphohistiocytosis: a case report. Exp Ther Med. 2016;12(3):1341–4.

    PubMed  PubMed Central  Google Scholar 

  36. Avior Y, Sagi I, Benvenisty N. Pluripotent stem cells in disease modelling and drug discovery. Nat Rev Mol Cell Biol. 2016;17(3):170–82.

    Article  CAS  PubMed  Google Scholar 

  37. Wang F, Qi LS. Applications of CRISPR genome engineering in cell biology. Trends Cell Biol. 2016;26:875.

    Article  CAS  PubMed  Google Scholar 

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Acknowledgements

We would like to thank patients’ family for their willingness to take part in this study. We would like to thank Comprehensive Genetic Center personnel and physicians for their help and discussion.

Funding

This work was partly supported by the US NIH NINDS R01NS081208-01A1 awarded to Mohammad Ali Faghihi. Additionally, this work was partly supported by the NIMAD research grant awarded to Mohammad Ali Faghihi. The funding agencies has no role in the design of the study and collection, analysis, and interpretation of data.

Availability of data and materials

All data including NGS sequencing raw and analyzed data and sanger sequencing files will be provided to interested scientist upon request. The identified mutation will be uploaded into HGMC database as well as ClinVar website (Submission ID: SUB2423865).

Authors’ contributions

MAF conceived and designed the study, collected, assembled and interpreted data and wrote the manuscript. MRB and NSA clinically evaluated the patient’s interpreted data and wrote the manuscript. FM and HF performed the experiments and helped with writing of the manuscript. HD helped critically in revising the manuscript. All authors read and approved the final manuscript.

Competing interests

The authors declare that they have no competing interests.

Consent for publication

Patient’s father has signed informed consent to participate in this study and to allow us to publish the result of study.

Ethics approval and consent to participate

Ethic committee at Shiraz University of Medical Sciences, Comprehensive Medical Genetic center has approved the study and parents of affected individual has signed written consent indicating their voluntary contribution to the current study.

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Bordbar, M.R., Modarresi, F., Farazi Fard, M.A. et al. A case report of novel mutation in PRF1 gene, which causes familial autosomal recessive hemophagocytic lymphohistiocytosis. BMC Med Genet 18, 49 (2017). https://doi.org/10.1186/s12881-017-0404-9

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