13-48480039-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000321.3(RB1):c.2755A>T(p.Ser919Cys) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign 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. S919G) 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: 3.63

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.16940111).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RB1	NM_000321.3	c.2755A>T	p.Ser919Cys	missense_variant	27/27	ENST00000267163.6
RB1	NM_001407168.1	c.205A>T	p.Ser69Cys	missense_variant	4/4
RB1	NM_001407165.1	c.*2A>T		3_prime_UTR_variant	27/27

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RB1	ENST00000267163.6	c.2755A>T	p.Ser919Cys	missense_variant	27/27	1	NM_000321.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.072
BayesDel_addAF	Benign	-0.027	T
BayesDel_noAF	Benign	-0.28
Cadd	Benign	22
Dann	Uncertain	0.98
DEOGEN2	Benign	0.42	T
Eigen	Benign	0.086
Eigen_PC	Benign	0.18
FATHMM_MKL	Benign	0.67	D
LIST_S2	Benign	0.78	T
M_CAP	Benign	0.036	D
MetaRNN	Benign	0.17	T
MetaSVM	Benign	-0.75	T
MutationAssessor	Benign	0.90	L
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.37	T
PROVEAN	Benign	-0.74	N
REVEL	Benign	0.28
Sift	Uncertain	0.023	D
Sift4G	Uncertain	0.037	D
Polyphen		0.69	P
Vest4		0.25
MutPred		0.42		Loss of phosphorylation at S919 (P = 0.0106);
MVP		0.81
MPC		1.1
ClinPred		0.58	D
GERP RS		3.7
Varity_R		0.11
gMVP		0.054

Splicing

Name	Calibrated prediction	Score	Prediction
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: chr13-49054175;