17-66216884-C-T

Variant names:

• chr17-66216884-C-T
• NM_000042.3:c.688G>A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_000042.3(APOH):​c.688G>A​(p.Ala230Thr) variant causes a missense change involving the alteration of a non-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: APOH NM_000042.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.33

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 Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
APOH	NM_000042.3	c.688G>A	p.Ala230Thr	missense_variant	Exon 6 of 8	ENST00000205948.11	NP_000033.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
APOH	ENST00000205948.11	c.688G>A	p.Ala230Thr	missense_variant	Exon 6 of 8	1	NM_000042.3	ENSP00000205948.6
APOH	ENST00000581797.5	c.508G>A	p.Ala170Thr	missense_variant	Exon 6 of 6	3		ENSP00000463553.1
APOH	ENST00000585162.1	c.160G>A	p.Ala54Thr	missense_variant	Exon 2 of 3	2		ENSP00000462260.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jan 21, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.688G>A (p.A230T) alteration is located in exon 6 (coding exon 6) of the APOH gene. This alteration results from a G to A substitution at nucleotide position 688, causing the alanine (A) at amino acid position 230 to be replaced by a threonine (T). 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	Benign	0.34
BayesDel_addAF	Uncertain	0.088	D
BayesDel_noAF	Benign	-0.11
CADD	Uncertain	24
DANN	Benign	0.93
DEOGEN2	Benign	0.15	T;.
Eigen	Uncertain	0.38
Eigen_PC	Uncertain	0.42
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Benign	0.81	T;T
M_CAP	Benign	0.028	D
MetaRNN	Uncertain	0.55	D;D
MetaSVM	Benign	-0.54	T
MutationAssessor	Benign	1.4	L;.
PrimateAI	Uncertain	0.49	T
PROVEAN	Benign	-1.3	N;.
REVEL	Benign	0.28
Sift	Benign	0.10	T;.
Sift4G	Benign	0.15	T;.
Polyphen		0.86	P;.
Vest4		0.49
MutPred		0.60		Gain of sheet (P = 0.0221);.;
MVP		0.52
MPC		0.55
ClinPred		0.90	D
GERP RS		5.9
Varity_R		0.54
gMVP		0.60

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: chr17-64213002;