13-37579350-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_006475.3(POSTN):c.1670A>G(p.Asn557Ser) variant causes a missense change. The variant allele was found at a frequency of 0.0000126 in 1,429,220 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000013 (0 hom.)
• Consequence: POSTN NM_006475.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.66

Genes affected

POSTN (HGNC:16953): (periostin) This gene encodes a secreted extracellular matrix protein that functions in tissue development and regeneration, including wound healing, and ventricular remodeling following myocardial infarction. The encoded protein binds to integrins to support adhesion and migration of epithelial cells. This protein plays a role in cancer stem cell maintenance and metastasis. Mice lacking this gene exhibit cardiac valve disease, and skeletal and dental defects. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Sep 2015]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.34471038).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
POSTN	NM_006475.3	c.1670A>G	p.Asn557Ser	missense_variant	13/23	ENST00000379747.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
POSTN	ENST00000379747.9	c.1670A>G	p.Asn557Ser	missense_variant	13/23	1	NM_006475.3	P3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000402 AC: 1 AN: 248958 Hom.: 0 AF XY: 0.00000742 AC XY: 1 AN XY: 134746

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: 0.0000335

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000126 AC: 18 AN: 1429220 Hom.: 0 Cov.: 32 AF XY: 0.00000842 AC XY: 6 AN XY: 712514

Gnomad4 AFR exome AF: 0.0000306

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000118

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000148

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 17, 2022

The c.1670A>G (p.N557S) alteration is located in exon 13 (coding exon 13) of the POSTN gene. This alteration results from a A to G substitution at nucleotide position 1670, causing the asparagine (N) at amino acid position 557 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.098	T
BayesDel_noAF	Benign	-0.28
Cadd	Uncertain	25
Dann	Uncertain	1.0
Eigen	Uncertain	0.26
Eigen_PC	Uncertain	0.36
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.97	D;D;D;D;D;D
M_CAP	Benign	0.031	D
MetaRNN	Benign	0.34	T;T;T;T;T;T
MetaSVM	Uncertain	0.085	D
MutationAssessor	Benign	1.2	L;.;L;L;L;L
MutationTaster	Benign	0.99	D;D;D;D;D;D
PrimateAI	Uncertain	0.60	T
PROVEAN	Benign	-1.7	N;N;N;N;N;N
REVEL	Uncertain	0.36
Sift	Benign	0.16	T;T;T;T;T;T
Sift4G	Benign	0.27	T;T;T;T;T;T
Polyphen		0.81	P;.;.;P;.;P
Vest4		0.51
MutPred		0.39		Gain of catalytic residue at Q560 (P = 0.0077);Gain of catalytic residue at Q560 (P = 0.0077);Gain of catalytic residue at Q560 (P = 0.0077);Gain of catalytic residue at Q560 (P = 0.0077);Gain of catalytic residue at Q560 (P = 0.0077);Gain of catalytic residue at Q560 (P = 0.0077);
MVP		0.89
MPC		0.55
ClinPred		0.47	T
GERP RS		6.0
Varity_R		0.21
gMVP		0.57

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs750139319; hg19: chr13-38153487;