dbSNP rs545529507: SFTPC:c.-56_-55dupAA (chr8-22161772-T-TAA) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 8P and 10B. PVS1BP6_ModerateBS1BS2

The NM_001385654.1(SFTPC):c.-53-3_-53-2dupAA variant causes a splice acceptor, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000899 in 1,613,728 control chromosomes in the GnomAD database, including 2 homozygotes. Variant has been reported in ClinVar as Likely benign (★).

Frequency

Genomes: 𝑓 0.00013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000086 ( 2 hom. )

Consequence

SFTPC
NM_001385654.1 splice_acceptor, intron

Scores

Not classified

Clinical Significance

Likely benign criteria provided, single submitter B:2

Conservation

PhyloP100: 3.28

Publications

0 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):

SFTPC-related interstitial lung disease
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
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 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PVS1

Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.

BP6

Variant 8-22161772-T-TAA is Benign according to our data. Variant chr8-22161772-T-TAA is described in ClinVar as Likely_benign. ClinVar VariationId is 362548.Status of the report is criteria_provided_single_submitter, 1 stars.

BS1

Variant frequency is greater than expected in population eas. GnomAd4 allele frequency = 0.000131 (20/152168) while in subpopulation EAS AF = 0.00368 (19/5162). AF 95% confidence interval is 0.00241. There are 0 homozygotes in GnomAd4. There are 10 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High AC in GnomAd4 at 20 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001385654.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	HGVSc	Effect	Exon Rank	Protein	UniProt
SFTPC	NM_001385654.1	c.-53-3_-53-2dupAA	splice_acceptor intron	N/A	NP_001372583.1	A0A0S2Z4Q0
SFTPC	NM_001385655.1	c.-53-3_-53-2dupAA	splice_acceptor intron	N/A	NP_001372584.1	A0A0S2Z4Q0
SFTPC	NM_001385656.1	c.-53-3_-53-2dupAA	splice_acceptor intron	N/A	NP_001372585.1	P11686-2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
SFTPC	ENST00000318561.7	TSL:1	c.-56_-55dupAA	5_prime_UTR	Exon 1 of 6	ENSP00000316152.3	P11686-1
SFTPC	ENST00000950317.1		c.-56_-55dupAA	5_prime_UTR	Exon 1 of 4	ENSP00000620376.1
SFTPC	ENST00000905727.1		c.-56_-55dupAA	5_prime_UTR	Exon 1 of 4	ENSP00000575786.1

Frequencies

GnomAD3 genomes

AF:

0.000132

AC:

AN:

152050

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00367

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000417

AC:

104

AN:

249266

AF XY:

0.000384

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00567

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000330

GnomAD4 exome

AF:

0.0000855

AC:

125

AN:

1461560

Hom.:

Cov.:

AF XY:

0.0000867

AC XY:

AN XY:

727054

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00282

AC:

112

AN:

39696

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53200

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.00000270

AC:

AN:

1111924

Other (OTH)

AF:

0.000166

AC:

AN:

60384

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.497

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:

0.000131

AC:

AN:

152168

Hom.:

Cov.:

AF XY:

0.000134

AC XY:

AN XY:

74392

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41530

American (AMR)

AF:

0.0000654

AC:

AN:

15292

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00368

AC:

AN:

5162

South Asian (SAS)

AF:

0.00

AC:

AN:

4822

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10604

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67966

Other (OTH)

AF:

0.00

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.508

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:

0.000192

Hom.:

Bravo

AF:

0.000208

ClinVar

ClinVar submissions as Germline

Significance:Likely benign

Revision:criteria provided, single submitter

View on ClinVar

Pathogenic

VUS

Benign

Condition

Interstitial lung disease 2 (1)

Pulmonary Surfactant Metabolism Dysfunction, Dominant (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

PhyloP100

3.3

Mutation Taster

=300/0

polymorphism

(source)

Splicing

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over