8-143215283-C-G

Variant names:

• chr8-143215283-C-G
• rs587777643
• NM_178172.6:c.320C>G

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM1 PM2 PP3_Moderate PP5_Very_Strong

The NM_178172.6(GPIHBP1):​c.320C>G​(p.Ser107Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,460,682 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 Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: GPIHBP1 NM_178172.6 missense
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: -0.154

Genes affected

GPIHBP1 (HGNC:24945): (glycosylphosphatidylinositol anchored high density lipoprotein binding protein 1) This gene encodes a capillary endothelial cell protein that facilitates the lipolytic processing of triglyceride-rich lipoproteins. The encoded protein is a glycosylphosphatidylinositol-anchored protein that is a member of the lymphocyte antigen 6 (Ly6) family. This protein plays a major role in transporting lipoprotein lipase (LPL) from the subendothelial spaces to the capillary lumen. Mutations in this gene are the cause of hyperlipoproteinemia, type 1D. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Sep 2014]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PM1: In a mutagenesis_site Promotes formation of dimers and oligomers reducing number of monomers. (size 0) in uniprot entity HDBP1_HUMAN
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.904
• PP5: Variant 8-143215283-C-G is Pathogenic according to our data. Variant chr8-143215283-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 144021.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GPIHBP1	NM_178172.6	c.320C>G	p.Ser107Cys	missense_variant	Exon 4 of 4	ENST00000622500.2	NP_835466.2
GPIHBP1	NM_001301772.2	c.320C>G	p.Ser107Cys	missense_variant	Exon 4 of 5		NP_001288701.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GPIHBP1	ENST00000622500.2	c.320C>G	p.Ser107Cys	missense_variant	Exon 4 of 4	1	NM_178172.6	ENSP00000480053.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000802 AC: 2 AN: 249502 Hom.: 0 AF XY: 0.0000148 AC XY: 2 AN XY: 135246

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000892

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1460682 Hom.: 0 Cov.: 35 AF XY: 0.00000413 AC XY: 3 AN XY: 726622

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: 0.0000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hyperlipoproteinemia, type 1D Pathogenic:3

-

Neuberg Centre For Genomic Medicine, NCGM

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The missense variant c.320C>G (p.Ser107Cys) in GPIHBP1 gene has previously been reported in homozygous state in patients affected with hypertriglyceridemia (Plengpanich W. et al.,2014). The p.Ser107Cys variant is novel (not in any individuals) in 1000 Genomes and allele frequency of 0.0008016% is reported in gnomAD. This variant has been reported to the ClinVar database as Pathogenic but no details are available for independent assessment. The amino acid Ser at position 107 is changed to a Cys changing protein sequence and it might alter its composition and physico-chemical properties. The amino acid change p.Ser107Cys in GPIHBP1 is predicted as conserved by GERP++. For these reasons, this variant has been classified as Likely Pathogenic. -

Jul 11, 2014

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

-

Kasturba Medical College, Manipal, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal, India

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.91
BayesDel_addAF	Benign	-0.12	T
BayesDel_noAF	Benign	-0.31
CADD	Benign	22
DANN	Uncertain	0.99
Eigen	Uncertain	0.37
Eigen_PC	Uncertain	0.23
FATHMM_MKL	Benign	0.76	D
M_CAP	Pathogenic	0.52	D
MetaRNN	Pathogenic	0.90	D
MetaSVM	Uncertain	0.24	D
PrimateAI	Benign	0.34	T
Sift4G	Pathogenic	0.0	D
Vest4		0.67
MutPred		0.56		Loss of glycosylation at S107 (P = 0.0311);
MVP		0.75
ClinPred		0.86	D
GERP RS		4.2
gMVP		0.89

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

LitVar

Other links and lift over

dbSNP: rs587777643; hg19: chr8-144297158;