Genetic Variant PHKA2:p.Thr1213Ser (chrX-18893555-G-C) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 6P and 2B. PM2PP3_StrongBP6_Moderate

The NM_000292.3(PHKA2):c.3638C>G(p.Thr1213Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000178 in 112,295 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

Frequency

Genomes: 𝑓 0.000018 ( 0 hom., 1 hem., cov: 23)

Exomes 𝑓: 9.1e-7 ( 0 hom. 1 hem. )

Failed GnomAD Quality Control

Consequence

PHKA2
NM_000292.3 missense

Scores

Clinical Significance

Likely benign criteria provided, single submitter B:1

Conservation

PhyloP100: 9.54

Variant links:

Genes affected

PHKA2 (HGNC:8926): (phosphorylase kinase regulatory subunit alpha 2) Phosphorylase kinase is a polymer of 16 subunits, four each of alpha, beta, gamma and delta. The alpha subunit includes the skeletal muscle and hepatic isoforms, and the hepatic isoform is encoded by this gene. The beta subunit is the same in both the muscle and hepatic isoforms, and encoded by one gene. The gamma subunit also includes the skeletal muscle and hepatic isoforms, which are encoded by two different genes. The delta subunit is a calmodulin and can be encoded by three different genes. The gamma subunits contain the active site of the enzyme, whereas the alpha and beta subunits have regulatory functions controlled by phosphorylation. The delta subunit mediates the dependence of the enzyme on calcium concentration. Mutations in this gene cause glycogen storage disease type 9A, also known as X-linked liver glycogenosis. Alternatively spliced transcript variants have been reported, but the full-length nature of these variants has not been determined.[provided by RefSeq, Feb 2010]

PHKA2 links:

PHKA2-AS1 (HGNC:44110): (PHKA2 antisense RNA 1)

PHKA2-AS1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.951

BP6

Variant X-18893555-G-C is Benign according to our data. Variant chrX-18893555-G-C is described in ClinVar as [Likely_benign]. Clinvar id is 3634781.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PHKA2	NM_000292.3 link	c.3638C>G	p.Thr1213Ser	missense_variant	Exon 33 of 33	ENST00000379942.5	NP_000283.1	P46019

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PHKA2	ENST00000379942.5 link	c.3638C>G	p.Thr1213Ser	missense_variant	Exon 33 of 33	1	NM_000292.3	ENSP00000369274.4		P46019

Frequencies

GnomAD3 genomes

AF:

0.0000178

AC:

AN:

112295

Hom.:

Cov.:

AF XY:

0.0000290

AC XY:

AN XY:

34465

show subpopulations

Gnomad AFR

AF:

0.0000647

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

GnomAD4 exome

Data not reliable, filtered out with message: AS_VQSR

AF:

9.11e-7

AC:

AN:

1097528

Hom.:

Cov.:

AF XY:

0.00000276

AC XY:

AN XY:

362888

show subpopulations

Gnomad4 AFR exome

AF:

0.0000379

Gnomad4 AMR exome

AF:

0.00

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000178

AC:

AN:

112295

Hom.:

Cov.:

AF XY:

0.0000290

AC XY:

AN XY:

34465

show subpopulations

Gnomad4 AFR

AF:

0.0000647

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

Bravo

AF:

0.00000378

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Glycogen storage disease IXa1

Benign:1

Nov 04, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.17

BayesDel_addAF

Uncertain

0.079

BayesDel_noAF

Benign

-0.12

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.52

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Benign

0.84

M_CAP

Pathogenic

0.57

MetaRNN

Pathogenic

0.95

MetaSVM

Uncertain

0.077

MutationAssessor

Benign

1.7

PrimateAI

Uncertain

0.66

PROVEAN

Uncertain

-3.7

REVEL

Pathogenic

0.65

Sift

Benign

0.043

Sift4G

Benign

0.13

Polyphen

0.70

Vest4

0.72

MutPred

0.82

Gain of disorder (P = 0.0787);

MVP

0.71

MPC

0.20

ClinPred

0.97

GERP RS

5.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.73

gMVP

0.66

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