Novel point mutation and intronic mutations of <em>RB1</em> gene in retinoblastoma patients in Indonesia

  • Batari Todja Umar Department of Ophthalmology, Faculty of Medicine, Universitas Hasanuddin, Makassar, Indonesia https://orcid.org/0000-0002-9734-3215
  • Ulfah Rimayanti Department of Ophthalmology, Faculty of Medicine, Universitas Hasanuddin, Makassar, Indonesia; School of Medicine, Universitas Islam Negeri Alauddin Makassar, Makassar, Indonesia https://orcid.org/0000-0001-9952-5533
  • Halimah Pagarra Department of Ophthalmology, Faculty of Medicine, Universitas Hasanuddin, Makassar, Indonesia
  • Budu Department of Ophthalmology, Faculty of Medicine, Universitas Hasanuddin, Makassar, Indonesia; Graduate School of Universitas Hasanuddin, Universitas Hasanuddin, Makassar, Indonesia
  • Nasrum Massi Department of Microbiology, Faculty of Medicine, Universitas Hasanuddin, Makassar, Indonesia
  • Habibah Setyawati Muhiddin Department of Ophthalmology, Faculty of Medicine, Universitas Hasanuddin, Makassar, Indonesia https://orcid.org/0000-0003-3019-2691
Keywords: germline mutation, RB1 gene, retinoblastoma

Abstract

BACKGROUND Retinoblastoma (RB) is an inherited disorder caused by the RB1 gene mutation in retinal cells or germline mutation. Identifying the specific mutation is crucial for prognosis, inheritance risk assessment, and treatment planning. This study aimed to identify the germline mutation in the RB1 gene in patients with RB and their parents from the eastern part of Indonesia.

METHODS This observational analytic study recruited patients with RB and their parents between 2016 and 2018 at Dr. Wahidin Sudirohusodo Hospital, Makassar, Indonesia. The normal control subjects were children from the outpatient clinic at the Department of Ophthalmology, Universitas Hasanuddin Hospital. Ophthalmic examinations and peripheral blood tests were performed in RB patients, their parents, and control subjects. Genomic DNA was isolated from blood leukocytes and amplified using conventional PCR. Hotspot exons 8, 10, 14, 17, and 22 were screened for mutations using the Sanger method.

RESULTS There were 21 patients with RB (16 unilateral and 5 bilateral) and 14 normal subjects. Of the 184 variations detected in RB patients, 164 were also found in normal subjects. 19 intronic mutations in introns 10, 16, 17, and 21, and 1 novel missense mutation in exon 17 were identified. Parental testing revealed 8 substitutions in exon 17 and 5 intronic mutations in introns 16 and 17 of the parents. None of the variations in exons were passed to their children.

CONCLUSIONS This study found a novel missense mutation in exon 17 of the RB1 gene.

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Published
2023-03-29
How to Cite
1.
Umar BT, Rimayanti U, Pagarra H, Budu, Massi N, Muhiddin HS. Novel point mutation and intronic mutations of <em>RB1</em&gt; gene in retinoblastoma patients in Indonesia. Med J Indones [Internet]. 2023Mar.29 [cited 2024Feb.22];31(4):218-24. Available from: https://mji.ui.ac.id/journal/index.php/mji/article/view/6544
Section
Basic Medical Research

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