rs121912720

chr11-116837121-G-Achr11-116837121-G-Cchr11-116837121-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PM5 PP3

The NM_000039.3(APOA1):c.80C>T(p.Pro27Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000657 in 152,224 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. P27R) has been classified as Pathogenic.

• Frequency: Genomes: 𝑓 0.0000066 (0 hom., cov: 33)
• Consequence: APOA1 NM_000039.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.16

Genes affected

APOA1 (HGNC:600): (apolipoprotein A1) This gene encodes apolipoprotein A-I, which is the major protein component of high density lipoprotein (HDL) in plasma. The encoded preproprotein is proteolytically processed to generate the mature protein, which promotes cholesterol efflux from tissues to the liver for excretion, and is a cofactor for lecithin cholesterolacyltransferase (LCAT), an enzyme responsible for the formation of most plasma cholesteryl esters. This gene is closely linked with two other apolipoprotein genes on chromosome 11. Defects in this gene are associated with HDL deficiencies, including Tangier disease, and with systemic non-neuropathic amyloidosis. Alternative splicing results in multiple transcript variants, at least one of which encodes a preproprotein. [provided by RefSeq, Dec 2015]

APOA1-AS (HGNC:40079): (APOA1 antisense RNA)

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-116837121-G-C is described in ClinVar as [Pathogenic]. Clinvar id is 17914.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.804

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
APOA1	NM_000039.3	c.80C>T	p.Pro27Leu	missense_variant	3/4	ENST00000236850.5
APOA1-AS	NR_126362.1	n.123+882G>A		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
APOA1	ENST00000236850.5	c.80C>T	p.Pro27Leu	missense_variant	3/4	1	NM_000039.3	P1
APOA1-AS	ENST00000669664.1	n.74+882G>A		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152224 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 35

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152224 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 74364

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.18
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	-0.080
Cadd	Uncertain	24
Dann	Uncertain	1.0
DEOGEN2	Benign	0.36	T;T;T;T
Eigen	Uncertain	0.37
Eigen_PC	Uncertain	0.35
FATHMM_MKL	Uncertain	0.93	D
M_CAP	Uncertain	0.20	D
MetaRNN	Pathogenic	0.80	D;D;D;D
MetaSVM	Uncertain	-0.16	T
MutationAssessor	Uncertain	2.8	M;M;M;M
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-1.4	N;N;N;N
REVEL	Uncertain	0.36
Sift	Uncertain	0.0020	D;D;D;D
Sift4G	Uncertain	0.0040	D;D;D;D
Polyphen		1.0	D;D;D;D
Vest4		0.68
MutPred		0.31		Loss of disorder (P = 0.0315);Loss of disorder (P = 0.0315);Loss of disorder (P = 0.0315);Loss of disorder (P = 0.0315);
MVP		0.93
MPC		1.5
ClinPred		0.95	D
GERP RS		4.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.22
gMVP		0.26

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: rs121912720; hg19: chr11-116707837;