20-37018330-C-T

Variant names:

• chr20-37018330-C-T
• rs774526314
• NM_002895.5:c.2671G>A

Variant summary

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

The NM_002895.5(RBL1):​c.2671G>A​(p.Val891Ile) variant causes a missense 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. 16/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: RBL1 NM_002895.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.443

Genes affected

RBL1 (HGNC:9893): (RB transcriptional corepressor like 1) The protein encoded by this gene is similar in sequence and possibly function to the product of the retinoblastoma 1 (RB1) gene. The RB1 gene product is a tumor suppressor protein that appears to be involved in cell cycle regulation, as it is phosphorylated in the S to M phase transition and is dephosphorylated in the G1 phase of the cell cycle. Both the RB1 protein and the product of this gene can form a complex with adenovirus E1A protein and SV40 large T-antigen, with the SV40 large T-antigen binding only to the unphosphorylated form of each protein. In addition, both proteins can inhibit the transcription of cell cycle genes containing E2F binding sites in their promoters. Due to the sequence and biochemical similarities with the RB1 protein, it is thought that the protein encoded by this gene may also be a tumor suppressor. Two transcript variants encoding different isoforms have been found for this gene. [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=0.0813252).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RBL1	NM_002895.5	c.2671G>A	p.Val891Ile	missense_variant	Exon 19 of 22	ENST00000373664.8	NP_002886.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RBL1	ENST00000373664.8	c.2671G>A	p.Val891Ile	missense_variant	Exon 19 of 22	1	NM_002895.5	ENSP00000362768.3
RBL1	ENST00000344359.7	c.2671G>A	p.Val891Ile	missense_variant	Exon 19 of 21	1		ENSP00000343646.3

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	-0.043	T
BayesDel_noAF	Benign	-0.30
CADD	Benign	12
DANN	Benign	0.62
DEOGEN2	Benign	0.27	T;.
Eigen	Benign	-0.87
Eigen_PC	Benign	-0.71
FATHMM_MKL	Benign	0.53	D
LIST_S2	Benign	0.58	T;T
M_CAP	Benign	0.020	T
MetaRNN	Benign	0.081	T;T
MetaSVM	Benign	-0.62	T
MutationAssessor	Benign	1.3	L;L
PrimateAI	Benign	0.36	T
PROVEAN	Benign	-0.35	N;N
REVEL	Benign	0.23
Sift	Benign	0.41	T;T
Sift4G	Benign	0.49	T;T
Polyphen		0.0	B;B
Vest4		0.046
MutPred		0.53		Gain of methylation at K896 (P = 0.1235);Gain of methylation at K896 (P = 0.1235);
MVP		0.69
MPC		0.19
ClinPred		0.042	T
GERP RS		1.5
Varity_R		0.024
gMVP		0.10

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs774526314; hg19: chr20-35646733;