rs1553903357

chr4-54267690-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_006206.6(PDGFRA):c.1070T>C(p.Ile357Thr) 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. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I357F) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PDGFRA NM_006206.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.77

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 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, PDGFRA
• BP4: Computational evidence support a benign effect (MetaRNN=0.0778321).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PDGFRA	NM_006206.6	c.1070T>C	p.Ile357Thr	missense_variant	7/23	ENST00000257290.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PDGFRA	ENST00000257290.10	c.1070T>C	p.Ile357Thr	missense_variant	7/23	1	NM_006206.6	P1
PDGFRA	ENST00000509092.5	n.888T>C		non_coding_transcript_exon_variant	6/15	1
PDGFRA	ENST00000509490.5	c.1070T>C	p.Ile357Thr	missense_variant, NMD_transcript_variant	7/18	1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

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

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jan 22, 2018

In summary, this variant is a novel missense change that is not predicted to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: (SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). The threonine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a PDGFRA-related disease. This sequence change replaces isoleucine with threonine at codon 357 of the PDGFRA protein (p.Ile357Thr). The isoleucine residue is moderately conserved and there is a moderate physicochemical difference between isoleucine and threonine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.057
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.46
Cadd	Benign	15
Dann	Benign	0.81
DEOGEN2	Benign	0.066	T
Eigen	Benign	-0.35
Eigen_PC	Benign	-0.13
FATHMM_MKL	Uncertain	0.85	D
LIST_S2	Benign	0.75	T
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.078	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.44	N
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.50	T
PROVEAN	Benign	1.3	N
REVEL	Benign	0.080
Sift	Benign	0.64	T
Sift4G	Benign	0.59	T
Polyphen		0.027	B
Vest4		0.14
MutPred		0.38		Loss of stability (P = 0.015);
MVP		0.30
MPC		0.43
ClinPred		0.11	T
GERP RS		4.6
Varity_R		0.060
gMVP		0.41

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: rs1553903357; hg19: chr4-55133857;