chr20-33286179-A-G

Position:

• chr20-33286179-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_033197.3(BPIFB1):​c.106A>G​(p.Ile36Val) variant causes a missense 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. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: BPIFB1 NM_033197.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.884

Genes affected

BPIFB1 (HGNC:16108): (BPI fold containing family B member 1) The protein encoded by this gene may be involved in the innate immune response to bacterial exposure in the mouth, nasal cavities, and lungs. The encoded protein is secreted and is a member of the BPI/LBP/PLUNC protein superfamily. This gene is found with other members of the superfamily in a cluster on chromosome 20. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17802346).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
BPIFB1	NM_033197.3	c.106A>G	p.Ile36Val	missense_variant	2/16	ENST00000253354.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
BPIFB1	ENST00000253354.2	c.106A>G	p.Ile36Val	missense_variant	2/16	1	NM_033197.3	P1
BPIFB1	ENST00000423645.5	c.106A>G	p.Ile36Val	missense_variant	2/5	3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251422 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135880

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000879

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

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

Ambry Genetics

Dec 17, 2023

The c.106A>G (p.I36V) alteration is located in exon 2 (coding exon 1) of the BPIFB1 gene. This alteration results from a A to G substitution at nucleotide position 106, causing the isoleucine (I) at amino acid position 36 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.43
CADD	Benign	16
DANN	Uncertain	0.99
DEOGEN2	Benign	0.042	T;T
Eigen	Benign	-0.042
Eigen_PC	Benign	-0.084
FATHMM_MKL	Benign	0.50	D
LIST_S2	Benign	0.55	T;T
M_CAP	Benign	0.0042	T
MetaRNN	Benign	0.18	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.1	.;M
MutationTaster	Benign	0.98	N
PrimateAI	Benign	0.43	T
PROVEAN	Benign	-0.97	N;N
REVEL	Benign	0.022
Sift	Pathogenic	0.0	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		0.83	.;P
Vest4		0.26
MutPred		0.31		Gain of methylation at K37 (P = 0.069);Gain of methylation at K37 (P = 0.069);
MVP		0.31
MPC		0.14
ClinPred		0.81	D
GERP RS		1.1
Varity_R		0.13
gMVP		0.33

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: rs749788143; hg19: chr20-31873985;