17-66214639-C-T

Position:

• chr17-66214639-C-T

Variant summary

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

The NM_000042.3(APOH):​c.796G>A​(p.Val266Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: APOH NM_000042.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.214

Genes affected

APOH (HGNC:616): (apolipoprotein H) Apolipoprotein H, also known as beta-2-glycoprotein I, is a component of circulating plasma lipoproteins. It has been implicated in a variety of physiologic pathways including lipoprotein metabolism, coagulation, hemostasis, and the production of antiphospholipid autoantibodies. APOH may be a required cofactor for anionic phospholipid binding by the antiphospholipid autoantibodies found in sera of many patients with lupus and primary antiphospholipid syndrome (APS). The anti-beta (2) glycoprotein I antibodies from APS patients, mediate inhibition of activated protein C which has anticoagulant properties. Because beta-2-GPI is the main autoantigen in patients with APS, the disruption of this pathway by autoantibodies may be an important mechanism for thrombosis in patients with APS.[provided by RefSeq, Dec 2019]

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=0.038250923).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
APOH	NM_000042.3	c.796G>A	p.Val266Ile	missense_variant	7/8	ENST00000205948.11	NP_000033.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
APOH	ENST00000205948.11	c.796G>A	p.Val266Ile	missense_variant	7/8	1	NM_000042.3	ENSP00000205948.6
APOH	ENST00000585162.1	c.256+2149G>A		intron_variant		2		ENSP00000462260.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.065
BayesDel_addAF	Benign	-0.36	T
BayesDel_noAF	Benign	-0.75
CADD	Benign	0.20
DANN	Benign	0.71
DEOGEN2	Benign	0.052	T
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.036	N
LIST_S2	Benign	0.65	T
M_CAP	Benign	0.0069	T
MetaRNN	Benign	0.038	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-0.095	N
PrimateAI	Benign	0.33	T
PROVEAN	Benign	0.25	N
REVEL	Benign	0.014
Sift	Benign	0.91	T
Sift4G	Benign	0.59	T
Polyphen		0.0	B
Vest4		0.037
MutPred		0.41		Loss of catalytic residue at V266 (P = 0.0728);
MVP		0.055
MPC		0.12
ClinPred		0.040	T
GERP RS		-4.5
Varity_R		0.036
gMVP		0.25

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: rs4581; hg19: chr17-64210757;