Genetic Variant APBB3:p.Ala319Ser (chr5-140560716-C-A) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_133173.3(APBB3):c.955G>T(p.Ala319Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,878 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/24 in silico tools predict a benign 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. A319T) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

APBB3
NM_133173.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.349

Publications

0 publications found

Variant links:

Genes affected

APBB3 (HGNC:20708): (amyloid beta precursor protein binding family B member 3) The protein encoded by this gene is a member of the APBB protein family. It is found in the cytoplasm and binds to the intracellular domain of the Alzheimer's disease beta-amyloid precursor protein (APP) as well as to other APP-like proteins. It is thought that the protein encoded by this gene may modulate the internalization of APP. Multiple transcript variants encoding several different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

APBB3 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_133173.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
APBB3	NM_133173.3	MANE Select	c.955G>T	p.Ala319Ser	missense	Exon 11 of 13	NP_573419.2	O95704-1
APBB3	NM_006051.4		c.976G>T	p.Ala326Ser	missense	Exon 11 of 13	NP_006042.3
APBB3	NM_133172.3		c.970G>T	p.Ala324Ser	missense	Exon 10 of 12	NP_573418.2	O95704-3

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
APBB3	ENST00000357560.9	TSL:5 MANE Select	c.955G>T	p.Ala319Ser	missense	Exon 11 of 13	ENSP00000350171.4	O95704-1
APBB3	ENST00000356738.6	TSL:1	c.970G>T	p.Ala324Ser	missense	Exon 10 of 12	ENSP00000349177.2	O95704-3
APBB3	ENST00000412920.7	TSL:1	c.949G>T	p.Ala317Ser	missense	Exon 10 of 12	ENSP00000402591.3	O95704-2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461878

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727244

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53412

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1112006

Other (OTH)

AF:

0.00

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.425

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.068

BayesDel_addAF

Benign

-0.36

BayesDel_noAF

Benign

-0.75

CADD

Benign

(source)

DANN

Benign

0.76

DEOGEN2

Benign

0.032

Eigen

Benign

-1.3

Eigen_PC

Benign

-1.3

FATHMM_MKL

Benign

0.093

LIST_S2

Benign

0.68

M_CAP

Benign

0.0043

MetaRNN

Benign

0.024

MetaSVM

Benign

-0.95

MutationAssessor

Benign

-1.2

PhyloP100

0.35

PrimateAI

Benign

0.23

PROVEAN

Benign

1.1

REVEL

Benign

0.015

Sift

Benign

1.0

Sift4G

Benign

1.0

Polyphen

0.0

Vest4

0.049

MutPred

0.43

Loss of helix (P = 0.0558)

MVP

0.42

MPC

0.23

ClinPred

0.044

GERP RS

1.6

Varity_R

0.060

gMVP

0.25

Mutation Taster

=86/14

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.29

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.29

Position offset: -5

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over