chr20-33301306-C-T

Position:

• chr20-33301306-C-T

Variant summary

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

The NM_033197.3(BPIFB1):​c.821C>T​(p.Thr274Ile) 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. 14/21 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: -0.291

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=0.07183346).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
BPIFB1	NM_033197.3	c.821C>T	p.Thr274Ile	missense_variant	9/16	ENST00000253354.2	NP_149974.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
BPIFB1	ENST00000253354.2	c.821C>T	p.Thr274Ile	missense_variant	9/16	1	NM_033197.3	ENSP00000253354	P1
BPIFB1	ENST00000464032.1	n.449C>T		non_coding_transcript_exon_variant	4/13	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

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

Ambry Genetics

Dec 09, 2023

The c.821C>T (p.T274I) alteration is located in exon 9 (coding exon 8) of the BPIFB1 gene. This alteration results from a C to T substitution at nucleotide position 821, causing the threonine (T) at amino acid position 274 to be replaced by an isoleucine (I). 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	0.10
BayesDel_addAF	Benign	-0.37	T
BayesDel_noAF	Benign	-0.77
CADD	Benign	3.3
DANN	Uncertain	0.98
DEOGEN2	Benign	0.0043	T
Eigen	Benign	-0.94
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.041	N
LIST_S2	Benign	0.39	T
M_CAP	Benign	0.0033	T
MetaRNN	Benign	0.072	T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	1.8	L
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.29	T
PROVEAN	Benign	-2.0	N
REVEL	Benign	0.030
Sift	Benign	0.16	T
Sift4G	Benign	0.061	T
Polyphen		0.44	B
Vest4		0.088
MutPred		0.52		Loss of disorder (P = 0.2335);
MVP		0.092
MPC		0.18
ClinPred		0.30	T
GERP RS		-1.0
Varity_R		0.035
gMVP		0.13

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr20-31889112;