2-28538332-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_153021.5(PLB1):c.569C>T(p.Ala190Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000372 in 1,613,146 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A190S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000020 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000039 (0 hom.)
• Consequence: PLB1 NM_153021.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.45

Genes affected

PLB1 (HGNC:30041): (phospholipase B1) This gene encodes a membrane-associated phospholipase that displays lysophospholipase and phospholipase A2 activities through removal of sn-1 and sn-2 fatty acids of glycerophospholipids. In addition, it displays lipase and retinyl ester hydrolase activities. The encoded protein is highly conserved and is composed of a large, glycosylated extracellular domain composed of four tandem homologous domains, followed by a hydrophobic segment that anchors the enzyme to the membrane and a short C-terminal cytoplasmic tail. This gene has been identified as a candidate rheumatoid arthritis risk gene. [provided by RefSeq, Jul 2016]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.04720542).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PLB1	NM_153021.5	c.569C>T	p.Ala190Val	missense_variant	10/58	ENST00000327757.10
PLB1	NM_001170585.2	c.602C>T	p.Ala201Val	missense_variant	10/57

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PLB1	ENST00000327757.10	c.569C>T	p.Ala190Val	missense_variant	10/58	1	NM_153021.5	P1
PLB1	ENST00000422425.6	c.602C>T	p.Ala201Val	missense_variant	10/57	1
PLB1	ENST00000404858.5	c.599C>T	p.Ala200Val	missense_variant	10/57	1
PLB1	ENST00000416713.5	c.434C>T	p.Ala145Val	missense_variant	10/11	5

Frequencies

GnomAD3 genomes AF: 0.0000198 AC: 3 AN: 151890 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000194

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000642 AC: 16 AN: 249094 Hom.: 0 AF XY: 0.0000370 AC XY: 5 AN XY: 134982

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000116

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000491

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000267

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000390 AC: 57 AN: 1461256 Hom.: 0 Cov.: 31 AF XY: 0.0000316 AC XY: 23 AN XY: 726904

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000447

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000302

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000360

Gnomad4 OTH exome AF: 0.0000331

GnomAD4 genome AF: 0.0000198 AC: 3 AN: 151890 Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1 AN XY: 74154

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000194

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.00

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.0000494 AC: 6

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

Jun 23, 2023

The c.569C>T (p.A190V) alteration is located in exon 10 (coding exon 10) of the PLB1 gene. This alteration results from a C to T substitution at nucleotide position 569, causing the alanine (A) at amino acid position 190 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	0.084
BayesDel_addAF	Benign	-0.43	T
BayesDel_noAF	Benign	-0.53
Cadd	Benign	0.26
Dann	Benign	0.85
Eigen	Benign	-1.0
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.0081	N
LIST_S2	Benign	0.45	T;T;T
M_CAP	Benign	0.0039	T
MetaRNN	Benign	0.047	T;T;T
MetaSVM	Benign	-1.0	T
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.22	T
PROVEAN	Benign	-0.52	N;N;N
REVEL	Benign	0.034
Sift	Benign	0.42	T;T;T
Sift4G	Benign	0.45	T;T;T
Polyphen		0.066, 0.48	.;B;P
Vest4		0.24, 0.16
MVP		0.095
MPC		0.042
ClinPred		0.046	T
GERP RS		-6.5
Varity_R		0.030
gMVP		0.079

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: rs377283820; hg19: chr2-28761199; COSMIC: COSV59831648;