chr19-44908690-C-A

Position:

• chr19-44908690-C-A

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1 PM2 PP3_Strong

The NM_000041.4(APOE):​c.394C>A​(p.Arg132Ser) 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 pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R132C) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: APOE NM_000041.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.65

Genes affected

APOE (HGNC:613): (apolipoprotein E) The protein encoded by this gene is a major apoprotein of the chylomicron. It binds to a specific liver and peripheral cell receptor, and is essential for the normal catabolism of triglyceride-rich lipoprotein constituents. This gene maps to chromosome 19 in a cluster with the related apolipoprotein C1 and C2 genes. Mutations in this gene result in familial dysbetalipoproteinemia, or type III hyperlipoproteinemia (HLP III), in which increased plasma cholesterol and triglycerides are the consequence of impaired clearance of chylomicron and VLDL remnants. [provided by RefSeq, Jun 2016]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM1: In a region_of_interest 8 X 22 AA approximate tandem repeats (size 175) in uniprot entity APOE_HUMAN there are 20 pathogenic changes around while only 8 benign (71%) in NM_000041.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.973

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
APOE	NM_000041.4	c.394C>A	p.Arg132Ser	missense_variant	4/4	ENST00000252486.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
APOE	ENST00000252486.9	c.394C>A	p.Arg132Ser	missense_variant	4/4	1	NM_000041.4	P1
APOE	ENST00000425718.1	c.394C>A	p.Arg132Ser	missense_variant	3/3	1
APOE	ENST00000434152.5	c.472C>A	p.Arg158Ser	missense_variant	4/4	2
APOE	ENST00000446996.5	c.394C>A	p.Arg132Ser	missense_variant	4/4	2

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	Pathogenic	0.73
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.040
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.44	T;T;.;.
Eigen	Uncertain	0.55
Eigen_PC	Uncertain	0.45
FATHMM_MKL	Uncertain	0.84	D
LIST_S2	Uncertain	0.87	D;D;D;D
M_CAP	Pathogenic	0.47	D
MetaRNN	Pathogenic	0.97	D;D;D;D
MetaSVM	Uncertain	0.44	D
MutationAssessor	Uncertain	2.3	M;.;.;.
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.51	T
PROVEAN	Uncertain	-4.2	D;D;.;D
REVEL	Pathogenic	0.66
Sift	Uncertain	0.0010	D;D;.;D
Sift4G	Uncertain	0.012	D;D;D;D
Polyphen		1.0	D;.;.;.
Vest4		0.52
MutPred		0.84		Loss of MoRF binding (P = 0.0395);Loss of MoRF binding (P = 0.0395);.;Loss of MoRF binding (P = 0.0395);
MVP		0.95
MPC		1.7
ClinPred		0.99	D
GERP RS		5.3
RBP_binding_hub_radar		1.1
RBP_regulation_power_radar		3.9
Varity_R		0.94
gMVP		0.73

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: rs11542041; hg19: chr19-45411947;