ClinVar Miner

Submissions for variant NM_000321.2(RB1):c.-198G>A

dbSNP: rs387906521
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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Ambry Genetics RCV000492684 SCV000580798 pathogenic Hereditary cancer-predisposing syndrome 2019-01-24 criteria provided, single submitter clinical testing The c.-198G>A pathogenic mutation is located in the 5' untranslated region (5’ UTR) of the RB1 gene. This pathogenic mutation results from a G to A substitution 198 bases upstream from the first translated codon. In one study, c.-198G>A was determined to segregate with disease in a family with hereditary retinoblastoma. In addition, these authors demonstrated that the alteration interfered with binding of an essential RB1 transcription factor. Of note, multiple unaffected individuals were determined to carry the alteration, suggesting reduced penetrance (Sakai T et al. Nature. 1991;353(6339):83-6). This mutation has also been described in a patient presenting with unilateral retinoblastoma at 18 months of age, who had no family history of retinoblastoma (Pradhan MA et al. Clin. Experiment. Ophthalmol. 2010;38(3):231-6) and as a de novo alteration in a male individual presenting with unilateral retinoblastoma at 15 months of age ( Zajaczek S, et al. Eur. J. Cancer 1998 Nov; 34(12):1919-21). Based on nucleotide sequence alignment, this position is highly conserved in vertebrate species. Based on the supporting evidence, c.-198G>A is interpreted as a disease-causing mutation exhibiting reduced penetrance.
Invitae RCV000013961 SCV001580876 pathogenic Retinoblastoma 2023-02-01 criteria provided, single submitter clinical testing For these reasons, this variant has been classified as Pathogenic. Experimental studies have shown that this variant affects RB1 function (PMID: 1881452). Algorithms developed to predict the effect of variants on protein structure and function are not available or were not evaluated for this variant. ClinVar contains an entry for this variant (Variation ID: 13086). This variant has been observed in individual(s) with retinoblastoma (PMID: 1881452, 10673998, 20447117). In at least one individual the variant was observed to be de novo. It has also been observed to segregate with disease in related individuals. This variant is not present in population databases (gnomAD no frequency). This variant occurs in a non-coding region of the RB1 gene. It does not change the encoded amino acid sequence of the RB1 protein.
OMIM RCV000013961 SCV000034208 pathogenic Retinoblastoma 1991-09-05 no assertion criteria provided literature only

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