2-85662402-A-T

Variant names:

• chr2-85662402-A-T
• rs2040349
• NM_000542.5:c.1003-293T>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_000542.5(SFTPB):​c.1003-293T>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: SFTPB NM_000542.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.90
• Publications: 16 publications found

Genes affected

SFTPB (HGNC:10801): (surfactant protein B) This gene encodes the pulmonary-associated surfactant protein B (SPB), an amphipathic 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. The SPB enhances the rate of spreading and increases the stability of surfactant monolayers in vitro. Multiple mutations in this gene have been identified, which cause pulmonary surfactant metabolism dysfunction type 1, also called pulmonary alveolar proteinosis due to surfactant protein B deficiency, and are associated with fatal respiratory distress in the neonatal period. Alternatively spliced transcript variants encoding the same protein have been identified.[provided by RefSeq, Feb 2010]

SFTPB Gene-Disease associations (from GenCC):

• surfactant metabolism dysfunction, pulmonary, 1

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet, Labcorp Genetics (formerly Invitae)

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.94).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SFTPB	NM_000542.5	c.1003-293T>A		intron_variant	Intron 8 of 10	ENST00000519937.7	NP_000533.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SFTPB	ENST00000519937.7	c.1003-293T>A		intron_variant	Intron 8 of 10	1	NM_000542.5	ENSP00000428719.2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Data not reliable, filtered out with message: AC0;AS_VQSR AF: 0.00 AC: 0 AN: 653900 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 324094

African (AFR) AF: 0.00 AC: 0 AN: 15296

American (AMR) AF: 0.00 AC: 0 AN: 13576

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 10370

East Asian (EAS) AF: 0.00 AC: 0 AN: 17196

South Asian (SAS) AF: 0.00 AC: 0 AN: 44764

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 15180

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 1900

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 507678

Other (OTH) AF: 0.00 AC: 0 AN: 27940

GnomAD4 genome Cov.: 31

Alfa AF: 0.00 Hom.: 15026

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.94
CADD	Benign	0.11
DANN	Benign	0.64
PhyloP100		-1.9

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: rs2040349; hg19: chr2-85889525;