rs1131690851

Variant names:

• chr13-48379606-G-A
• rs1131690851
• NM_000321.3:c.1345G>A

Your query was ambiguous. Multiple possible variants found:

• chr13-48379606-G-A
• chr13-48379606-G-C
• chr13-48379606-G-T

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PM1 PM2 PM5 PP3_Moderate PP5_Very_Strong

The NM_000321.3(RB1):​c.1345G>A​(p.Gly449Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G449E) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 30)
• Consequence: RB1 NM_000321.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 9.09
• Publications: 7 publications found

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]

RB1 Gene-Disease associations (from GenCC):

• hereditary retinoblastoma

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
• retinoblastoma

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• melanoma

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics

LOC112268118 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 16 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 27 uncertain in NM_000321.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr13-48379607-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 2736027.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.929
• PP5: Variant 13-48379606-G-A is Pathogenic according to our data. Variant chr13-48379606-G-A is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 428669.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000321.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RB1	NM_000321.3	MANE Select	c.1345G>A	p.Gly449Arg	missense	Exon 14 of 27	NP_000312.2	P06400
	RB1	NM_001407165.1		c.1345G>A	p.Gly449Arg	missense	Exon 14 of 27	NP_001394094.1	A0A3B3IS71
	RB1	NM_001407166.1		c.1345G>A	p.Gly449Arg	missense	Exon 14 of 17	NP_001394095.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RB1	ENST00000267163.6	TSL:1 MANE Select	c.1345G>A	p.Gly449Arg	missense	Exon 14 of 27	ENSP00000267163.4	P06400
	RB1	ENST00000467505.6	TSL:1	n.*713G>A		non_coding_transcript_exon	Exon 9 of 22	ENSP00000434702.1	Q92728
	RB1	ENST00000467505.6	TSL:1	n.*713G>A		3_prime_UTR	Exon 9 of 22	ENSP00000434702.1	Q92728

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 30

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Pathogenic/Likely pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
2	-	-	Retinoblastoma (2)
1	-	-	Hereditary cancer-predisposing syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.46	D
BayesDel_noAF	Pathogenic	0.43
CADD	Pathogenic	29
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.91	D
Eigen	Pathogenic	0.90
Eigen_PC	Pathogenic	0.89
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.94	D
M_CAP	Uncertain	0.16	D
MetaRNN	Pathogenic	0.93	D
MetaSVM	Uncertain	0.78	D
MutationAssessor	Uncertain	2.5	M
PhyloP100		9.1
PrimateAI	Pathogenic	0.84	D
PROVEAN	Pathogenic	-4.4	D
REVEL	Pathogenic	0.93
Sift	Uncertain	0.0010	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.91
MutPred		0.80		Gain of catalytic residue at Q444 (P = 0)
MVP		0.99
MPC		1.4
ClinPred		1.0	D
GERP RS		5.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.98
gMVP		0.90
Mutation Taster		=1/99	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.39		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.39		Position offset: -12

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

Other links and lift over

dbSNP: rs1131690851; hg19: chr13-48953742; COSMIC: COSV104565163; COSMIC: COSV104565163;