12-57138528-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_002332.3(LRP1):c.137G>C(p.Arg46Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic 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. R46Q) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: LRP1 NM_002332.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.38

Genes affected

LRP1 (HGNC:6692): (LDL receptor related protein 1) This gene encodes a member of the low-density lipoprotein receptor family of proteins. The encoded preproprotein is proteolytically processed by furin to generate 515 kDa and 85 kDa subunits that form the mature receptor (PMID: 8546712). This receptor is involved in several cellular processes, including intracellular signaling, lipid homeostasis, and clearance of apoptotic cells. In addition, the encoded protein is necessary for the alpha 2-macroglobulin-mediated clearance of secreted amyloid precursor protein and beta-amyloid, the main component of amyloid plaques found in Alzheimer patients. Expression of this gene decreases with age and has been found to be lower than controls in brain tissue from Alzheimer's disease patients. [provided by RefSeq, Oct 2015]

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, LRP1
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.852

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
LRP1	NM_002332.3	c.137G>C	p.Arg46Pro	missense_variant	2/89	ENST00000243077.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
LRP1	ENST00000243077.8	c.137G>C	p.Arg46Pro	missense_variant	2/89	1	NM_002332.3	P1
LRP1	ENST00000554174.1	c.137G>C	p.Arg46Pro	missense_variant	2/8	1
LRP1	ENST00000553277.5	c.137G>C	p.Arg46Pro	missense_variant	2/7	1
LRP1	ENST00000338962.8	c.137G>C	p.Arg46Pro	missense_variant	2/7	1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

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

Oct 27, 2023

The c.137G>C (p.R46P) alteration is located in exon 2 (coding exon 2) of the LRP1 gene. This alteration results from a G to C substitution at nucleotide position 137, causing the arginine (R) at amino acid position 46 to be replaced by a proline (P). 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	0.98
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.12
Cadd	Pathogenic	27
Dann	Uncertain	1.0
Eigen	Pathogenic	0.95
Eigen_PC	Pathogenic	0.88
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.96	D;D;D;D
M_CAP	Uncertain	0.16	D
MetaRNN	Pathogenic	0.85	D;D;D;D
MetaSVM	Benign	-0.31	T
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.64	T
PROVEAN	Uncertain	-4.2	D;N;D;D
REVEL	Uncertain	0.53
Sift	Benign	0.034	D;T;D;T
Sift4G	Uncertain	0.042	D;D;T;D
Polyphen		1.0	D;D;.;D
Vest4		0.92
MutPred		0.60		Gain of catalytic residue at K43 (P = 0);Gain of catalytic residue at K43 (P = 0);Gain of catalytic residue at K43 (P = 0);Gain of catalytic residue at K43 (P = 0);
MVP		0.59
ClinPred		1.0	D
GERP RS		5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.67
gMVP		0.95

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: rs146149784; hg19: chr12-57532311;