4-54258770-T-G

Variant names:

• chr4-54258770-T-G
• rs1722515777
• NM_006206.6:c.2T>G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PVS1_Supporting PM2

The NM_006206.6(PDGFRA):​c.2T>G​(p.Met1?) variant causes a start lost change. 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PDGFRA NM_006206.6 start_lost
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.63

Genes affected

PDGFRA (HGNC:8803): (platelet derived growth factor receptor alpha) This gene encodes a cell surface tyrosine kinase receptor for members of the platelet-derived growth factor family. These growth factors are mitogens for cells of mesenchymal origin. The identity of the growth factor bound to a receptor monomer determines whether the functional receptor is a homodimer or a heterodimer, composed of both platelet-derived growth factor receptor alpha and beta polypeptides. Studies suggest that this gene plays a role in organ development, wound healing, and tumor progression. Mutations in this gene have been associated with idiopathic hypereosinophilic syndrome, somatic and familial gastrointestinal stromal tumors, and a variety of other cancers. [provided by RefSeq, Mar 2012]

ENSG00000282278 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PVS1: Start lost variant, no pathogenic variants between lost start and next in-frame start position. Next in-frame start position is after 61 codons. Genomic position: 54261226. Lost 0.055 part of the original CDS.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PDGFRA	NM_006206.6	c.2T>G	p.Met1?	start_lost	Exon 2 of 23	ENST00000257290.10	NP_006197.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PDGFRA	ENST00000257290.10	c.2T>G	p.Met1?	start_lost	Exon 2 of 23	1	NM_006206.6	ENSP00000257290.5
ENSG00000282278	ENST00000507166.5	c.1018-16155T>G		intron_variant	Intron 12 of 23	2		ENSP00000423325.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Gastrointestinal stromal tumor Uncertain:1

Apr 02, 2020

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. This variant has not been reported in the literature in individuals with PDGFRA-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change affects the initiator methionine of the PDGFRA mRNA. The next in-frame methionine is located at codon 61. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.36	D
BayesDel_noAF	Pathogenic	0.28
CADD	Uncertain	24
DANN	Uncertain	0.98
DEOGEN2	Benign	0.042	T;.;T;.;.;T
Eigen	Uncertain	0.63
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.90	D;D;T;D;D;D
M_CAP	Pathogenic	0.47	D
MetaRNN	Pathogenic	0.98	D;D;D;D;D;D
MetaSVM	Uncertain	0.29	D
PROVEAN	Benign	-0.58	N;N;N;N;N;N
REVEL	Uncertain	0.34
Sift	Pathogenic	0.0	D;D;D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D;D;D
Polyphen		0.93	P;D;.;.;.;.
Vest4		0.93
MutPred		0.94		Gain of methylation at M1 (P = 0.0046);Gain of methylation at M1 (P = 0.0046);.;Gain of methylation at M1 (P = 0.0046);Gain of methylation at M1 (P = 0.0046);Gain of methylation at M1 (P = 0.0046);
MVP		0.93
ClinPred		0.99	D
GERP RS		5.7
Varity_R		0.96
gMVP		0.88

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.21		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.21		Position offset: -13

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

Publications

LitVar

Other links and lift over

dbSNP: rs1722515777; hg19: chr4-55124937;