2-140238235-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_018557.3(LRP1B):c.13477C>G(p.Pro4493Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: LRP1B NM_018557.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.35

Genes affected

LRP1B (HGNC:6693): (LDL receptor related protein 1B) This gene encodes a member of the low density lipoprotein (LDL) receptor family. These receptors play a wide variety of roles in normal cell function and development due to their interactions with multiple ligands. Disruption of this gene has been reported in several types of cancer. [provided by RefSeq, Jun 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, LRP1B

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LRP1B	NM_018557.3	c.13477C>G	p.Pro4493Ala	missense_variant	89/91	ENST00000389484.8
LRP1B	XM_017004341.2	c.13087C>G	p.Pro4363Ala	missense_variant	89/91
LRP1B	XM_017004342.1	c.8329C>G	p.Pro2777Ala	missense_variant	60/62

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LRP1B	ENST00000389484.8	c.13477C>G	p.Pro4493Ala	missense_variant	89/91	1	NM_018557.3	P1
LRP1B	ENST00000437977.5	c.2173C>G	p.Pro725Ala	missense_variant	16/17	5
LRP1B	ENST00000442974.1	c.787C>G	p.Pro263Ala	missense_variant	7/7	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 27

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

Aug 28, 2023

The c.13477C>G (p.P4493A) alteration is located in exon 89 (coding exon 89) of the LRP1B gene. This alteration results from a C to G substitution at nucleotide position 13477, causing the proline (P) at amino acid position 4493 to be replaced by an alanine (A). 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	Pathogenic	0.64
BayesDel_addAF	Benign	-0.0055	T
BayesDel_noAF	Benign	-0.25
Cadd	Uncertain	24
Dann	Uncertain	0.99
DEOGEN2	Uncertain	0.58	D
Eigen	Uncertain	0.65
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.93	D
M_CAP	Benign	0.015	T
MetaRNN	Uncertain	0.67	D
MetaSVM	Benign	-0.85	T
MutationAssessor	Uncertain	2.1	M
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.71	T
PROVEAN	Uncertain	-3.9	D
REVEL	Uncertain	0.31
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.91	P
Vest4		0.71
MutPred		0.65		Loss of sheet (P = 0.1158);
MVP		0.16
MPC		0.43
ClinPred		0.99	D
GERP RS		5.8
Varity_R		0.54
gMVP		0.76

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-140995804;