rs587778154

chr11-119296931-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_005188.4(CBL):c.2050C>T(p.Pro684Ser) variant causes a missense change. The variant allele was found at a frequency of 0.0000236 in 1,443,168 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. P684P) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000024 (0 hom.)
• Consequence: CBL NM_005188.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:4 O:1
• Conservation: PhyloP100: 3.69

Genes affected

CBL (HGNC:1541): (Cbl proto-oncogene) This gene is a proto-oncogene that encodes a RING finger E3 ubiquitin ligase. The encoded protein is one of the enzymes required for targeting substrates for degradation by the proteasome. This protein mediates the transfer of ubiquitin from ubiquitin conjugating enzymes (E2) to specific substrates. This protein also contains an N-terminal phosphotyrosine binding domain that allows it to interact with numerous tyrosine-phosphorylated substrates and target them for proteasome degradation. As such it functions as a negative regulator of many signal transduction pathways. This gene has been found to be mutated or translocated in many cancers including acute myeloid leukaemia, and expansion of CGG repeats in the 5' UTR has been associated with Jacobsen syndrome. Mutations in this gene are also the cause of Noonan syndrome-like disorder. [provided by RefSeq, Jul 2016]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.12620735).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CBL	NM_005188.4	c.2050C>T	p.Pro684Ser	missense_variant	13/16	ENST00000264033.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CBL	ENST00000264033.6	c.2050C>T	p.Pro684Ser	missense_variant	13/16	1	NM_005188.4	P2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251236 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135796

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000880

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000236 AC: 34 AN: 1443168 Hom.: 0 Cov.: 29 AF XY: 0.0000236 AC XY: 17 AN XY: 719212

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000301

Gnomad4 OTH exome AF: 0.0000167

GnomAD4 genome Cov.: 32

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

CBL-related disorder Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Juvenile myelomonocytic leukemia Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Johns Hopkins Genomics, Johns Hopkins University

Sep 01, 2021

This CBL variant (rs587778154) is rare (<0.1%) in a large population dataset (gnomAD: 1/251236 total alleles; 0.00004%; no homozygotes) and has been reported in ClinVar. It has also been reported in a cohort of healthy individuals who were screened for variation in cancer-suceptibility genes. Three bioinformatic tools queried predict that this substitution would be tolerated and the proline residue at this position is evolutionarily conserved across most species assessed. We consider the clinical significance of CBL c.2050C>T to be uncertain at this time. -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Dec 19, 2016

The P684S variant has been published previously as a variant of uncertain significance as part of a study investigating cancer susceptibility variants in a healthy population (Bodian et al., 2014). The variant was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. P684S is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved in mammals; however, in silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. Therefore, based on the currently available information, it is unclear whether this variant is a pathogenic variant or a rare benign variant. -

RASopathy Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jan 24, 2024

This sequence change replaces proline, which is neutral and non-polar, with serine, which is neutral and polar, at codon 684 of the CBL protein (p.Pro684Ser). This variant is present in population databases (rs587778154, gnomAD 0.0009%). This variant has not been reported in the literature in individuals affected with CBL-related conditions. ClinVar contains an entry for this variant (Variation ID: 133807). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt CBL protein function with a negative predictive value of 95%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

not specified Other:1

not provided, no classification provided

reference population

ITMI

Sep 19, 2013

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Benign	-0.046	T
BayesDel_noAF	Benign	-0.30
Cadd	Benign	22
Dann	Benign	0.89
DEOGEN2	Benign	0.33	T;.;T;.
Eigen	Benign	-0.17
Eigen_PC	Benign	0.053
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Benign	0.83	T;T;T;T
M_CAP	Benign	0.016	T
MetaRNN	Benign	0.13	T;T;T;T
MetaSVM	Benign	-0.75	T
MutationAssessor	Uncertain	2.0	M;.;.;.
MutationTaster	Benign	0.89	D
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	-0.080	N;.;.;.
REVEL	Benign	0.13
Sift	Benign	0.25	T;.;.;.
Sift4G	Benign	0.82	T;T;T;.
Polyphen		0.0050	B;.;.;.
Vest4		0.49
MutPred		0.13		Gain of phosphorylation at P684 (P = 0.032);Gain of phosphorylation at P684 (P = 0.032);.;.;
MVP		0.88
MPC		0.20
ClinPred		0.28	T
GERP RS		5.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.055
gMVP		0.24

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

LitVar

Other links and lift over

dbSNP: rs587778154; hg19: chr11-119167641;