chr8-22162707-A-G

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 3P and 9B. PM1PP3BP6BS1BS2

The NM_001317778.2(SFTPC):c.176A>G(p.His59Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000196 in 1,614,122 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00012 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00020 ( 1 hom. )

Consequence

SFTPC
NM_001317778.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:2B:3

Conservation

PhyloP100: 2.54

Publications

3 publications found

Variant links:

Genes affected

SFTPC (HGNC:10802): (surfactant protein C) This gene encodes the pulmonary-associated surfactant protein C (SPC), an extremely hydrophobic surfactant protein essential for lung function and homeostasis after birth. Pulmonary surfactant is a surface-active lipoprotein complex composed of 90% lipids and 10% proteins which include plasma proteins and apolipoproteins SPA, SPB, SPC and SPD. The surfactant is secreted by the alveolar cells of the lung and maintains the stability of pulmonary tissue by reducing the surface tension of fluids that coat the lung. Multiple mutations in this gene have been identified, which cause pulmonary surfactant metabolism dysfunction type 2, also called pulmonary alveolar proteinosis due to surfactant protein C deficiency, and are associated with interstitial lung disease in older infants, children, and adults. Alternatively spliced transcript variants encoding different protein isoforms have been identified.[provided by RefSeq, Feb 2010]

SFTPC Gene-Disease associations (from GenCC):

surfactant metabolism dysfunction, pulmonary, 2
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae)
chronic respiratory distress with surfactant metabolism deficiency
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
SFTPC- related interstitial lung disease
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

SFTPC links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -6 ACMG points.

PM1

In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 7 uncertain in NM_001317778.2

PP3

MetaRNN computational evidence supports a deleterious effect, 0.753

BP6

Variant 8-22162707-A-G is Benign according to our data. Variant chr8-22162707-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 362554.

BS1

Variant frequency is greater than expected in population mid. GnomAdExome4 allele frequency = 0.000205 (299/1461866) while in subpopulation MID AF = 0.000867 (5/5766). AF 95% confidence interval is 0.000341. There are 1 homozygotes in GnomAdExome4. There are 158 alleles in the male GnomAdExome4 subpopulation. Median coverage is 37. This position passed quality control check.

BS2

High AC in GnomAd4 at 18 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SFTPC	NM_001317778.2 link	c.176A>G	p.His59Arg	missense_variant	Exon 2 of 6	ENST00000679463.1	NP_001304707.1	P11686A0A0A0MTC9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SFTPC	ENST00000679463.1 link	c.176A>G	p.His59Arg	missense_variant	Exon 2 of 6		NM_001317778.2	ENSP00000505152.1		A0A0A0MTC9

Frequencies

GnomAD3 genomes

AF:

0.000118

AC:

AN:

152256

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000723

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000620

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000147

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000224

AC:

AN:

249554

AF XY:

0.000266

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000869

Gnomad ASJ exome

AF:

0.000199

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000371

Gnomad OTH exome

AF:

0.000495

GnomAD4 exome

AF:

0.000205

AC:

299

AN:

1461866

Hom.:

Cov.:

AF XY:

0.000217

AC XY:

158

AN XY:

727236

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.000157

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.000243

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.0000187

AC:

AN:

53406

Middle Eastern (MID)

AF:

0.000867

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.000226

AC:

251

AN:

1112000

Other (OTH)

AF:

0.000232

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.483

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000118

AC:

AN:

152256

Hom.:

Cov.:

AF XY:

0.0000941

AC XY:

AN XY:

74386

show subpopulations

African (AFR)

AF:

0.0000723

AC:

AN:

41472

American (AMR)

AF:

0.000131

AC:

AN:

15288

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5196

South Asian (SAS)

AF:

0.000620

AC:

AN:

4836

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.000147

AC:

AN:

68044

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.486

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000294

Hom.:

Bravo

AF:

0.000128

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ExAC

AF:

0.000322

AC:

EpiCase

AF:

0.000600

EpiControl

AF:

0.000771

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:2Benign:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Pulmonary fibrosis

Pathogenic:1

Jun 09, 2022

Garcia Pulmonary Genetics Research Laboratory, Columbia University Irving Medical Center

Significance:Likely risk allele

Review Status:no assertion criteria provided

Collection Method:research

- -

not provided

Uncertain:1

Nov 23, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 362554). This missense change has been observed in individual(s) with clinical features of SFTPC-related conditions (PMID: 25657025, 33526882). This variant is present in population databases (rs201567623, gnomAD 0.03%), and has an allele count higher than expected for a pathogenic variant. This sequence change replaces histidine, which is basic and polar, with arginine, which is basic and polar, at codon 59 of the SFTPC protein (p.His59Arg). -

Hereditary pulmonary alveolar proteinosis

Uncertain:1

Aug 02, 2019

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.H59R variant (also known as c.176A>G), located in coding exon 2 of the SFTPC gene, results from an A to G substitution at nucleotide position 176. The histidine at codon 59 is replaced by arginine, an amino acid with highly similar properties. In one study, this variant was detected in trans with a second SFTPC alteration in a female with onset of symptoms at birth (Willander H et al. Proc. Natl. Acad. Sci. U.S.A., 2012 Feb;109:2325-9). In addition, this variant was identified in an individual with combined pulmonary fibrosis and emphysema syndrome with onset of symptoms at age 11 years; this individual's healthy father was also heterozygous for the variant (Kröner C et al. Eur. Respir. J., 2015 Jul;46:197-206). In our internal cohort, this variant was observed in the homozygous state in a proband exhibiting surfactant deficiency on lung biopsy; parental testing revealed that both of the unaffected parents were heterozygous. This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Based on available evidence to date, the clinical significance of this alteration remains unclear. -

not specified

Benign:1

May 04, 2022

Mendelics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Interstitial lung disease 2

Benign:1

Apr 28, 2017

Illumina Laboratory Services, Illumina

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. The evidence from the literature, in combination with allele frequency data from public databases where available, was sufficient to determine this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Surfactant metabolism dysfunction, pulmonary, 2

Benign:1

Apr 28, 2017

Illumina Laboratory Services, Illumina

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.25

BayesDel_addAF

Uncertain

0.028

BayesDel_noAF

Uncertain

0.11

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.13

T;T;.;D

Eigen

Uncertain

0.49

Eigen_PC

Uncertain

0.44

FATHMM_MKL

Benign

0.70

LIST_S2

Benign

0.74

T;T;T;T

M_CAP

Pathogenic

0.61

MetaRNN

Pathogenic

0.75

D;D;D;D

MetaSVM

Pathogenic

0.89

PhyloP100

2.5

PrimateAI

Uncertain

0.72

PROVEAN

Pathogenic

-5.0

D;D;D;D

REVEL

Pathogenic

0.92

Sift

Pathogenic

0.0

D;D;D;D

Sift4G

Pathogenic

0.0

D;D;D;D

Polyphen

1.0

.;.;D;D

Vest4

0.55

MVP

0.99

MPC

1.3

ClinPred

0.18

GERP RS

4.6

gMVP

0.84

Mutation Taster

=2/98

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over