rs761185076

chr4-54273539-G-Achr4-54273539-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_006206.6(PDGFRA):c.1367G>A(p.Cys456Tyr) variant causes a missense, splice region 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. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. C456C) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 31)
• Consequence: PDGFRA NM_006206.6 missense, splice_region
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.69

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, PDGFRA
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.904

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PDGFRA	NM_006206.6	c.1367G>A	p.Cys456Tyr	missense_variant, splice_region_variant	10/23	ENST00000257290.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PDGFRA	ENST00000257290.10	c.1367G>A	p.Cys456Tyr	missense_variant, splice_region_variant	10/23	1	NM_006206.6	P1
PDGFRA	ENST00000509092.5	n.1185G>A		splice_region_variant, non_coding_transcript_exon_variant	9/15	1
PDGFRA	ENST00000509490.5	c.1367G>A	p.Cys456Tyr	missense_variant, splice_region_variant, NMD_transcript_variant	10/18	1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Gastrointestinal stromal tumor Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Dec 28, 2023

This sequence change replaces cysteine, which is neutral and slightly polar, with tyrosine, which is neutral and polar, at codon 456 of the PDGFRA protein (p.Cys456Tyr). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with PDGFRA-related conditions. ClinVar contains an entry for this variant (Variation ID: 528503). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. 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
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.40	D
BayesDel_noAF	Pathogenic	0.34
Cadd	Uncertain	24
Dann	Uncertain	0.99
DEOGEN2	Uncertain	0.56	D
Eigen	Uncertain	0.53
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Benign	0.81	T
M_CAP	Benign	0.077	D
MetaRNN	Pathogenic	0.90	D
MetaSVM	Uncertain	-0.080	T
MutationAssessor	Uncertain	2.7	M
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.74	T
PROVEAN	Pathogenic	-7.4	D
REVEL	Pathogenic	0.70
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.018	D
Polyphen		0.91	P
Vest4		0.94
MutPred		0.69		Loss of methylation at K455 (P = 0.0298);
MVP		0.95
MPC		1.1
ClinPred		0.99	D
GERP RS		5.5
Varity_R		0.90
gMVP		0.85

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: rs761185076; hg19: chr4-55139706;