rs367654488

Positions:

• chr13-48347863-C-G
• chr13-48347863-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP5 BP4

The NM_000321.3(RB1):​c.539C>G​(p.Ser180Trp) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/23 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in Lovd as Likely pathogenic (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S180L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: RB1 NM_000321.3 missense, splice_region
• Scores: Splicing: ADA: 0.00009569
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.264

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 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 13-48347863-C-G is Pathogenic according to our data. Variant chr13-48347863-C-G is described in Lovd as [Likely_pathogenic].
• BP4: Computational evidence support a benign effect (MetaRNN=0.21895659). . Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RB1	NM_000321.3	c.539C>G	p.Ser180Trp	missense_variant, splice_region_variant	5/27	ENST00000267163.6
RB1	NM_001407165.1	c.539C>G	p.Ser180Trp	missense_variant, splice_region_variant	5/27
RB1	NM_001407166.1	c.539C>G	p.Ser180Trp	missense_variant, splice_region_variant	5/17

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RB1	ENST00000267163.6	c.539C>G	p.Ser180Trp	missense_variant, splice_region_variant	5/27	1	NM_000321.3	P1
RB1	ENST00000467505.5	c.138-12154C>G		intron_variant, NMD_transcript_variant		1
RB1	ENST00000650461.1	c.539C>G	p.Ser180Trp	missense_variant, splice_region_variant	5/27
RB1	ENST00000525036.1	n.701C>G		splice_region_variant, non_coding_transcript_exon_variant	5/7	3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.39
CADD	Benign	22
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.66	D;.
Eigen	Benign	-0.11
Eigen_PC	Benign	-0.11
FATHMM_MKL	Benign	0.50	N
LIST_S2	Benign	0.82	T;T
M_CAP	Benign	0.033	D
MetaRNN	Benign	0.22	T;T
MetaSVM	Benign	-0.81	T
MutationAssessor	Benign	0.0	N;.
MutationTaster	Benign	1.0	D
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-2.2	N;.
REVEL	Uncertain	0.35
Sift	Uncertain	0.017	D;.
Sift4G	Uncertain	0.014	D;.
Polyphen		0.96	D;.
Vest4		0.32
MutPred		0.43		Loss of disorder (P = 0);Loss of disorder (P = 0);
MVP		0.82
MPC		1.3
ClinPred		0.76	D
GERP RS		-0.78
Varity_R		0.17
gMVP		0.11

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000096
dbscSNV1_RF	Benign	0.49
SpliceAI score (max)		0.0		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: chr13-48921999;