NM_001098668.4:c.531C>G

Variant names:

• chr10-79557425-G-C
• rs374604304
• NM_001098668.4:c.531C>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_001098668.4(SFTPA2):​c.531C>G​(p.Phe177Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,666 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/20 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. F177Y) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: SFTPA2 NM_001098668.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.657
• Publications: 0 publications found

Genes affected

SFTPA2 (HGNC:10799): (surfactant protein A2) This gene is one of several genes encoding pulmonary-surfactant associated proteins (SFTPA) located on chromosome 10. Mutations in this gene and a highly similar gene located nearby, which affect the highly conserved carbohydrate recognition domain, are associated with idiopathic pulmonary fibrosis. The current version of the assembly displays only a single centromeric SFTPA gene pair rather than the two gene pairs shown in the previous assembly which were thought to have resulted from a duplication. [provided by RefSeq, Sep 2009]

SFTPA2 Gene-Disease associations (from GenCC):

• interstitial lung disease 2

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, ClinGen
• interstitial lung disease 2

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• idiopathic pulmonary fibrosis

  Inheritance: AD, Unknown Classification: MODERATE, LIMITED Submitted by: Genomics England PanelApp, Laboratory for Molecular Medicine

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 3 uncertain in NM_001098668.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.1273072).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001098668.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SFTPA2	NM_001098668.4	MANE Select	c.531C>G	p.Phe177Leu	missense	Exon 6 of 6	NP_001092138.1	Q8IWL1
	SFTPA2	NM_001320814.1		c.561C>G	p.Phe187Leu	missense	Exon 5 of 5	NP_001307743.1
	SFTPA2	NM_001320813.2		c.531C>G	p.Phe177Leu	missense	Exon 6 of 6	NP_001307742.1	Q8IWL1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SFTPA2	ENST00000372325.7	TSL:1 MANE Select	c.531C>G	p.Phe177Leu	missense	Exon 6 of 6	ENSP00000361400.2	Q8IWL1
	SFTPA2	ENST00000372327.9	TSL:1	c.531C>G	p.Phe177Leu	missense	Exon 5 of 5	ENSP00000361402.5	Q8IWL1
	SFTPA2	ENST00000959071.1		c.660C>G	p.Phe220Leu	missense	Exon 6 of 6	ENSP00000629130.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461666 Hom.: 0 Cov.: 34 AF XY: 0.00000275 AC XY: 2 AN XY: 727144

African (AFR) AF: 0.00 AC: 0 AN: 33472

American (AMR) AF: 0.00 AC: 0 AN: 44716

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.0000232 AC: 2 AN: 86250

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5764

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111838

Other (OTH) AF: 0.00 AC: 0 AN: 60376

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.69
BayesDel_addAF	Benign	-0.33	T
BayesDel_noAF	Benign	-0.71
CADD	Benign	1.2
DANN	Benign	0.88
Eigen	Benign	-1.5
Eigen_PC	Benign	-1.5
FATHMM_MKL	Benign	0.016	N
M_CAP	Benign	0.0044	T
MetaRNN	Benign	0.13	T
MetaSVM	Benign	-0.99	T
PhyloP100		-0.66
PrimateAI	Benign	0.48	T
PROVEAN	Benign	0.19	N
REVEL	Benign	0.047
Sift	Benign	0.36	T
Sift4G	Benign	0.81	T
Vest4		0.20
MutPred		0.59		Gain of ubiquitination at K180 (P = 0.1679)
MVP		0.12
MPC		1.2
ClinPred		0.15	T
GERP RS		-4.4
gMVP		0.36
Mutation Taster		=90/10	polymorphism

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

Other links and lift over

dbSNP: rs374604304; hg19: chr10-81317181; COSMIC: COSV100958790; COSMIC: COSV100958790;