13-48362848-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_000321.3(RB1):c.752G>T(p.Arg251Leu) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R251Q) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: RB1 NM_000321.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.83

Genes affected

RB1 (HGNC:9884): (RB transcriptional corepressor 1) The protein encoded by this gene is a negative regulator of the cell cycle and was the first tumor suppressor gene found. The encoded protein also stabilizes constitutive heterochromatin to maintain the overall chromatin structure. The active, hypophosphorylated form of the protein binds transcription factor E2F1. Defects in this gene are a cause of childhood cancer retinoblastoma (RB), bladder cancer, and osteogenic sarcoma. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.805

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RB1	NM_000321.3	c.752G>T	p.Arg251Leu	missense_variant	8/27	ENST00000267163.6
RB1	NM_001407165.1	c.752G>T	p.Arg251Leu	missense_variant	8/27
RB1	NM_001407166.1	c.752G>T	p.Arg251Leu	missense_variant	8/17

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RB1	ENST00000267163.6	c.752G>T	p.Arg251Leu	missense_variant	8/27	1	NM_000321.3	P1
RB1	ENST00000467505.5	c.*120G>T		3_prime_UTR_variant, NMD_transcript_variant	3/3	1
RB1	ENST00000650461.1	c.752G>T	p.Arg251Leu	missense_variant	8/27

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.78
BayesDel_addAF	Pathogenic	0.37	D
BayesDel_noAF	Pathogenic	0.30
Cadd	Pathogenic	32
Dann	Uncertain	1.0
DEOGEN2	Uncertain	0.62	D;.
Eigen	Pathogenic	0.84
Eigen_PC	Pathogenic	0.85
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.91	D;D
M_CAP	Uncertain	0.17	D
MetaRNN	Pathogenic	0.81	D;D
MetaSVM	Pathogenic	0.85	D
MutationAssessor	Uncertain	2.3	M;.
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.64	T
PROVEAN	Uncertain	-2.5	D;.
REVEL	Pathogenic	0.71
Sift	Uncertain	0.010	D;.
Sift4G	Pathogenic	0.0	D;.
Polyphen		1.0	D;.
Vest4		0.47
MutPred		0.50		Gain of catalytic residue at R251 (P = 0);Gain of catalytic residue at R251 (P = 0);
MVP		0.92
MPC		1.5
ClinPred		0.99	D
GERP RS		6.0
Varity_R		0.37
gMVP		0.54

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.16		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr13-48936984;