Genetic Variant ALG10B:p.Lys77Thr (chr12-38318319-A-C) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_001013620.4(ALG10B):c.230A>C(p.Lys77Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00000496 in 1,614,072 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000034 ( 0 hom. )

Consequence

ALG10B
NM_001013620.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.66

Variant links:

Genes affected

ALG10B (HGNC:31088): (ALG10 alpha-1,2-glucosyltransferase B) Enables transferase activity. Involved in positive regulation of inward rectifier potassium channel activity; positive regulation of protein glycosylation; and protein glycosylation. Located in endoplasmic reticulum. Implicated in long QT syndrome 2. [provided by Alliance of Genome Resources, Apr 2022]

ALG10B links:

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ACMG classification

Classification made for transcript

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
ALG10B	NM_001013620.4 link	c.230A>C	p.Lys77Thr	missense_variant	Exon 2 of 3	ENST00000308742.9	NP_001013642.2	Q5I7T1
ALG10B	NM_001308340.2 link	c.230A>C	p.Lys77Thr	missense_variant	Exon 2 of 3		NP_001295269.2
ALG10B	XM_005268665.5 link	c.50A>C	p.Lys17Thr	missense_variant	Exon 2 of 3		XP_005268722.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
ALG10B	ENST00000308742.9 link	c.230A>C	p.Lys77Thr	missense_variant	Exon 2 of 3	1	NM_001013620.4	ENSP00000310120.4	Q5I7T1
ALG10B	ENST00000548240.1 link	n.204A>C		non_coding_transcript_exon_variant	Exon 2 of 3	1		ENSP00000449210.1	F8VWA9
ALG10B	ENST00000551464.1 link	c.230A>C	p.Lys77Thr	missense_variant	Exon 2 of 3	3		ENSP00000448819.1	F8VXJ0
ALG10B	ENST00000553138.1 link	n.1553A>C		non_coding_transcript_exon_variant	Exon 1 of 2	3

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152220

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000795

AC:

AN:

251476

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135912

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.00000342

AC:

AN:

1461852

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727224

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000671

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152220

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

74362

show subpopulations

Gnomad4 AFR

AF:

0.0000724

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:

0.00

Gnomad4 OTH

AF:

0.00

ExAC

AF:

0.00000824

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jul 20, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.230A>C (p.K77T) alteration is located in exon 2 (coding exon 2) of the ALG10B gene. This alteration results from a A to C substitution at nucleotide position 230, causing the lysine (K) at amino acid position 77 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

Uncertain

0.40

BayesDel_addAF

Uncertain

0.047

BayesDel_noAF

Benign

-0.17

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.0074

T;.

Eigen

Uncertain

0.43

Eigen_PC

Uncertain

0.41

FATHMM_MKL

Uncertain

0.91

LIST_S2

Uncertain

0.93

D;D

M_CAP

Benign

0.0091

MetaRNN

Uncertain

0.67

D;D

MetaSVM

Benign

-0.76

MutationAssessor

Pathogenic

3.1

M;.

PrimateAI

Uncertain

0.73

PROVEAN

Uncertain

-2.9

D;D

REVEL

Benign

0.20

Sift

Uncertain

0.023

D;D

Sift4G

Benign

0.28

T;T

Polyphen

0.88

P;.

Vest4

0.79

MutPred

0.56

Gain of catalytic residue at V75 (P = 0);Gain of catalytic residue at V75 (P = 0);

MVP

0.72

MPC

0.31

ClinPred

0.95

GERP RS

3.7

Varity_R

0.65

gMVP

0.80

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over