chr4-54270725-A-G

Position:

• chr4-54270725-A-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PP2 PP3 BS2

The NM_006206.6(PDGFRA):​c.1214A>G​(p.Tyr405Cys) variant causes a missense change. The variant allele was found at a frequency of 0.00000625 in 1,440,426 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000062 (0 hom.)
• Consequence: PDGFRA NM_006206.6 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 5.18

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 Likely_benign. Variant got -2 ACMG points.

• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), PDGFRA. . Gene score misZ 1.9401 (greater than the threshold 3.09). Trascript score misZ 3.4078 (greater than threshold 3.09). GenCC has associacion of gene with congenital heart disease, polyps, multiple and recurrent inflammatory fibroid, gastrointestinal, gastrointestinal stromal tumor, isolated cleft palate.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.775
• BS2: High AC in GnomAdExome4 at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PDGFRA	NM_006206.6	c.1214A>G	p.Tyr405Cys	missense_variant	8/23	ENST00000257290.10	NP_006197.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PDGFRA	ENST00000257290.10	c.1214A>G	p.Tyr405Cys	missense_variant	8/23	1	NM_006206.6	ENSP00000257290	P1
PDGFRA	ENST00000509092.5	n.1032A>G		non_coding_transcript_exon_variant	7/15	1
PDGFRA	ENST00000509490.5	c.1214A>G	p.Tyr405Cys	missense_variant, NMD_transcript_variant	8/18	1		ENSP00000424218

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000625 AC: 9 AN: 1440426 Hom.: 0 Cov.: 26 AF XY: 0.00000557 AC XY: 4 AN XY: 718212

Gnomad4 AFR exome AF: 0.0000302

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: 0.00000732

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Polyps, multiple and recurrent inflammatory fibroid, gastrointestinal Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Baylor Genetics

Feb 13, 2024

- -

Gastrointestinal stromal tumor Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 04, 2023

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. 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 PDGFRA protein function. ClinVar contains an entry for this variant (Variation ID: 528600). This variant has not been reported in the literature in individuals affected with PDGFRA-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces tyrosine, which is neutral and polar, with cysteine, which is neutral and slightly polar, at codon 405 of the PDGFRA protein (p.Tyr405Cys). -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 14, 2023

The p.Y405C variant (also known as c.1214A>G), located in coding exon 7 of the PDGFRA gene, results from an A to G substitution at nucleotide position 1214. The tyrosine at codon 405 is replaced by cysteine, an amino acid with highly dissimilar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Uncertain	0.036	T
BayesDel_noAF	Benign	-0.19
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Benign	0.19	T
Eigen	Benign	0.085
Eigen_PC	Benign	0.069
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.89	D
M_CAP	Uncertain	0.11	D
MetaRNN	Pathogenic	0.78	D
MetaSVM	Benign	-0.64	T
MutationAssessor	Uncertain	2.4	M
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.75	T
PROVEAN	Benign	-2.3	N
REVEL	Benign	0.27
Sift	Benign	0.051	T
Sift4G	Benign	0.15	T
Polyphen		1.0	D
Vest4		0.76
MutPred		0.50		Gain of sheet (P = 0.0827);
MVP		0.64
MPC		1.1
ClinPred		0.93	D
GERP RS		4.6
Varity_R		0.39
gMVP		0.73

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: rs1553903757; hg19: chr4-55136892;