chr2-169282951-G-A

Position:

• chr2-169282951-G-A

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_004525.3(LRP2):​c.1093C>T​(p.Arg365*) variant causes a stop gained change. The variant allele was found at a frequency of 0.0000109 in 1,461,804 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000011 (0 hom.)
• Consequence: LRP2 NM_004525.3 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3 O:1
• Conservation: PhyloP100: 6.30

Genes affected

LRP2 (HGNC:6694): (LDL receptor related protein 2) The protein encoded by this gene, low density lipoprotein-related protein 2 (LRP2) or megalin, is a multi-ligand endocytic receptor that is expressed in many different tissues but primarily in absorptive epithilial tissues such as the kidney. This glycoprotein has a large amino-terminal extracellular domain, a single transmembrane domain, and a short carboxy-terminal cytoplasmic tail. The extracellular ligand-binding-domains bind diverse macromolecules including albumin, apolipoproteins B and E, and lipoprotein lipase. The LRP2 protein is critical for the reuptake of numerous ligands, including lipoproteins, sterols, vitamin-binding proteins, and hormones. This protein also has a role in cell-signaling; extracellular ligands include parathyroid horomones and the morphogen sonic hedgehog while cytosolic ligands include MAP kinase scaffold proteins and JNK interacting proteins. Recycling of this membrane receptor is regulated by phosphorylation of its cytoplasmic domain. Mutations in this gene cause Donnai-Barrow syndrome (DBS) and facio-oculoacoustico-renal syndrome (FOAR).[provided by RefSeq, Aug 2009]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 2-169282951-G-A is Pathogenic according to our data. Variant chr2-169282951-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 9457.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LRP2	NM_004525.3	c.1093C>T	p.Arg365*	stop_gained	10/79	ENST00000649046.1	NP_004516.2
LRP2	XM_011511183.4	c.1093C>T	p.Arg365*	stop_gained	10/78		XP_011509485.1
LRP2	XM_047444340.1	c.169C>T	p.Arg57*	stop_gained	10/79		XP_047300296.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LRP2	ENST00000649046.1	c.1093C>T	p.Arg365*	stop_gained	10/79		NM_004525.3	ENSP00000496870.1
LRP2	ENST00000443831.1	c.1093C>T	p.Arg365*	stop_gained	10/23	2		ENSP00000409813.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.0000109 AC: 16 AN: 1461804 Hom.: 0 Cov.: 32 AF XY: 0.0000179 AC XY: 13 AN XY: 727206

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000144

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Aug 02, 2023	For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 9457). This premature translational stop signal has been observed in individual(s) with Donnai-Barrow syndrome (PMID: 17632512, 25682901). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Arg365*) in the LRP2 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in LRP2 are known to be pathogenic (PMID: 17632512, 25682901). -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Apr 22, 2022	Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 25525159, 9475100, 30029678, 25682901, 33403612, 19089858, 31452935, 29779033, 17632512) -

Donnai-Barrow syndrome Pathogenic:1 Other:1

Pathogenic, no assertion criteria provided	literature only	OMIM	Aug 01, 2007	- -
not provided, no classification provided	literature only	GeneReviews	-	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.68	D
BayesDel_noAF	Pathogenic	0.66
CADD	Pathogenic	39
DANN	Uncertain	1.0
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.80
FATHMM_MKL	Pathogenic	0.98	D
Vest4		0.85, 0.81
GERP RS		5.4

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: rs80338744; hg19: chr2-170139461;