rs1554854656

chr10-79613992-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_005411.5(SFTPA1):c.626C>A(p.Thr209Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SFTPA1 NM_005411.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.36

Genes affected

SFTPA1 (HGNC:10798): (surfactant protein A1) This gene encodes a lung surfactant protein that is a member of a subfamily of C-type lectins called collectins. The encoded protein binds specific carbohydrate moieties found on lipids and on the surface of microorganisms. This protein plays an essential role in surfactant homeostasis and in the defense against respiratory pathogens. Mutations in this gene are associated with idiopathic pulmonary fibrosis. Alternate splicing results in multiple transcript variants. [provided by RefSeq, May 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 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, 4 uncertain in NM_005411.5
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SFTPA1	NM_005411.5	c.626C>A	p.Thr209Asn	missense_variant	6/6	ENST00000398636.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SFTPA1	ENST00000398636.8	c.626C>A	p.Thr209Asn	missense_variant	6/6	1	NM_005411.5	P1
SFTPA1	ENST00000419470.6	c.671C>A	p.Thr224Asn	missense_variant	6/6	1
SFTPA1	ENST00000428376.6	c.626C>A	p.Thr209Asn	missense_variant	5/5	1		P1

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

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Oct 10, 2017

The p.Thr224Asn variant in SFTPA1 has not been previously reported in individual s with surfactant deficiency or pulmonary fibrosis, or in large population studi es. Computational prediction tools and conservation analysis suggest that the p. Thr224Asn variant may impact the protein, though this information is not predict ive enough to determine pathogenicity. In summary, the clinical significance of the p.Thr224Asn variant is uncertain. ACMG/AMP Criteria applied: PM2, PP3 (Richa rds 2015). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.35
BayesDel_addAF	Benign	-0.21	T
BayesDel_noAF	Benign	-0.54
Cadd	Uncertain	23
Dann	Uncertain	0.99
DEOGEN2	Benign	0.16	T;T;.
Eigen	Uncertain	0.29
Eigen_PC	Benign	0.18
FATHMM_MKL	Benign	0.71	D
M_CAP	Benign	0.0056	T
MetaRNN	Uncertain	0.45	T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.8	L;L;.
MutationTaster	Benign	0.99	D;D;D;D;D
PrimateAI	Uncertain	0.61	T
PROVEAN	Uncertain	-3.0	D;D;D
REVEL	Benign	0.13
Sift	Uncertain	0.0020	D;D;D
Sift4G	Uncertain	0.0070	D;D;D
Polyphen		1.0	D;D;.
Vest4		0.43
MutPred		0.60		Loss of phosphorylation at T209 (P = 0.0753);Loss of phosphorylation at T209 (P = 0.0753);.;
MVP		0.34
MPC		2.1
ClinPred		0.96	D
GERP RS		2.9
Varity_R		0.85
gMVP		0.75

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: rs1554854656; hg19: chr10-81373748;