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Abstrak :
Mukopolisakaridosis II MPS II, atau sindrom Hunter, adalah penyakit resesif terpaut-X langka yang disebabkan oleh gangguan penyimpanan lisosomal akibat defisiensi enzim lisosomal iduronate-2-sulfatase IDS. Gen IDS penting dalam proses degradasi lisosomal dermatan sulfat dan heparan sulfat, karena defisiensi gen IDS akan mengarah pada akumulasi Glikosaminoglikans GAG tersebut. Analisis spesifik ekson pada ekson 6 dan ekson 8 gen IDS dilakukan pada penderita MPS II di Rumah Sakit Umum Pusat Nasional Dr. Cipto Mangunkusumo, Jakarta, Indonesia. Dalam penelitian ini, sampel dari penderita MPS II dan sampel normal dianalisis menggunakan PCR dan metode sekuensing. Hasil yang diperoleh menunjukkan mutasi-mutasi novel pada dua penderita MPS II di Indonesia. Satu mutasi insersi sepanjang 14 pb c.792_793insCCCCTGTGGCCTAC ditemukan pada ekson 6 dari gen IDS pada satu penderita. Mutasi tersebut menyebabkan perubahan asam amino di p.Asn265ProfsTer20. Variasi delesi satu basa nukleotida c.1023delA yang menyebabkan perubahan susunan asam amino dengan notasi p.Glu341AspfsTer19 ditemukan pada seluruh sampel. Selain itu, ditemukan pula mutasi missense novel c.1033T>C yang mengubah asam amino triptofan menjadi arginin p.Trp345Arg, dan variasi delesi satu basa nukleotida c.1041delA yang menyebabkan perubahan susunan asam amino dengan notasi p. Lys347AsnfsTer13 pada ekson 8 dari gen IDS pada satu penderita lain.

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Mucopolysaccharidosis II MPS II, or Hunter syndrome, is a rare X linked recessive disease caused by lysosomal storage disorder due to the deficiency of the lysosomal enzyme iduronate 2 sulfatase IDS . The IDS gene is important for the lysosomal degradation process of dermatan sulfate and heparan sulfate, as the deficiency of the IDS gene will lead to the accumulation of these Glycosaminoglycans GAGs. Exon specific analyses on exon 6 and exon 8 of the IDS gene were done on patients with MPS II in Cipto Mangunkusumo National Referral Hospital, Jakarta, Indonesia. In this study, samples from MPS II patients and normal samples were analyzed using PCR and sequencing methods. The results show novel mutations in Indonesian patients with MPS II. A 14 bp long insertion mutation c.792 793insCCCCTGTGGCCTAC were found on exon 6 of the IDS gene in one patient. This mutation leads to the alteration of amino acids at p.Asn265ProfsTer20. A single nucleotide deletion variant c.1023delA which leads to the alteration of amino acids in the p.Glu341AspfsTer19 was found in all patients. Other than that, a novel missense mutation c.1033T C which leads to the alteration of amino acid from tryptophan to arginine p.Trp345Arg and a single nucleotide deletion variant c.1041delA which leads to the alteration of amino acids at p.Lys347AsnfsTer13 on exon 8 of the IDS gene were found in another patient.

Abstrak :
Mukopolisakaridosis tipe II MPS II atau Sindrom Hunter merupakan salah satu kelainan penyimpanan lisosomal yang disebabkan oleh mutasi atau perubahan susunan basa nitrogen pada gen Iduronat 2-Sulfatase gen IDS. Mutasi tersebut dapat terjadi di berbagai lokasi ekson yang berbeda. Penelitian ini bertujuan untuk mengetahui adanya mutasi yang terjadi pada ekson 2 dan 5 gen IDS pada penderita MPS II, khususnya di Indonesia. Analisis dilakukan dengan menggunakan 9 sampel DNA penderita MPS II asal Indonesia dan 50 kontrol yang terdiri atas 25 individu normal berjenis kelamin laki-laki maupun perempuan. Analisis dilakukan dengan melewati tahapan isolasi DNA, amplifikasi Polymerase Chain Reaction PCR, visualisasi elektroforesis dan sekuensing. Hasil penelitian menunjukkan bahwa gen IDS dari keseluruhan sampel yang digunakan berhasil dianalisis namun tidak ditemukan adanya mutasi yang terjadi pada daerah ekson 2 dan 5 penderita MPS II di Indonesia.

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Mucopolysaccaridosis Type II MPS II or Syndrome Hunter is one of lysosomal storage disorder caused by mutation or changes of nitrogen base arrangement in IDS gene. This mutation can occur in various different exon locations. This research is aimed to recognize the presence of mutation that occur at exon 2 and 5 of gen IDS of MPS II patient, especially in Indonesia. Analysis was conducted by using 9 DNA MPS II patient samples of Indonesia origin and 50 controls that consists of 25 normal individual of male or female. Analysis was done by going through steps of DNA isolation, amplification by Polymerase Chain Reaction PCR, electrophoresis visualization, and sequencing. Research result shows that IDS gene from the whole samples used were successfully analysed, however there is no mutation found that occurred at exon 2 and 5 MPS II patients in Indonesia.

Abstrak :
Mukopolisakaridosis tipe II MPS II merupakan suatu sindrom yang disebabkan oleh defisiensi enzim iduronat 2-sulfatase I2S yang dikode oleh gen iduronat 2-sulfatase IDS. Mutasi pada gen IDS dapat menyebabkan perubahan struktur dan fungsi dari enzim I2S yang dihasilkan. Penelitian ini dilakukan untuk mengetahui dan menganalisis mutasi gen iduronat 2-sulfatase IDS ekson 4 dan 7 pada penderita MPS II di Indonesia. Sampel DNA diekstraksi dari darah 9 individu penderita MPS II dan 50 individu normal 25 laki-laki dan 25 perempuan. Sekuens gen IDS ekson 4 dan 7 dari sampel-sampel tersebut diamplifikasi menggunakan metode PCR. Hasil dari proses PCR divisualisasi menggunakan Agarose Gel Electrophoresis AGE, kemudian disekuensing menggunakan metode automated sequencing. Hasil penelitian menunjukkan adanya mutasi delesi c.435_440delTACCGA yang merupakan varian likely pathogenic dan mutasi silent c.489G>A yang merupakan varian likely benign pada ekson 4, serta satu mutasi missense yang merupakan varian pathogenic pada ekson 7, yaitu c.998 C>T.

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Mucopolysaccharidosis type II MPS II is a syndrome which is caused by deficiency of iduronate 2 sulfatase enzyme, coded by iduronate 2 sulfatase IDS gene. Mutation in IDS gene can alter structure and function of the resulting I2S enzyme. This study was conducted to analyze IDS gene mutations of exon 4 and 7 in mucopolysaccharidosis type II patients in Indonesia. DNA samples were extracted from the blood of 9 MPS II patients males and 50 normal individuals which consists of 25 males and 25 females. The sequence of IDS gene exon 4 and 7 from those samples were amplified using PCR method. PCR results were visualized using Agarose Gel Electrophoresis AGE, and were sequenced using automated sequencing. The results showed one deletion c.435 440delTACCGA which is classified as likely pathogenic variant and one silent mutation c.489G A which is a likely benign variant on exon 4, and one missense mutation of pathogenic variant on exon 7, c.998 C T.