rs138395800

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_000292.3(PHKA2):c.2365C>T(p.Pro789Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000121 in 1,208,972 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 35 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.00064 ( 0 hom., 19 hem., cov: 23)

Exomes 𝑓: 0.000067 ( 0 hom. 16 hem. )

Consequence

PHKA2
NM_000292.3 missense

Scores

Clinical Significance

Likely benign criteria provided, multiple submitters, no conflicts B:3

Conservation

PhyloP100: 1.62

Publications

0 publications found

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 Gene-Disease associations (from GenCC):

glycogen storage disease IXa1
Inheritance: XL Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp
glycogen storage disease due to liver phosphorylase kinase deficiency
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

PHKA2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.025713265).

BP6

Variant X-18908052-G-A is Benign according to our data. Variant chrX-18908052-G-A is described in ClinVar as Likely_benign. ClinVar VariationId is 445969.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000643 (72/112029) while in subpopulation AFR AF = 0.0022 (68/30852). AF 95% confidence interval is 0.00178. There are 0 homozygotes in GnomAd4. There are 19 alleles in the male GnomAd4 subpopulation. Median coverage is 23. This position passed quality control check.

BS2

High Hemizygotes in GnomAd4 at 19 XL,AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000292.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
PHKA2	NM_000292.3	MANE Select	c.2365C>T	p.Pro789Ser	missense	Exon 22 of 33	NP_000283.1
PHKA2	NM_001440805.1		c.2365C>T	p.Pro789Ser	missense	Exon 22 of 33	NP_001427734.1
PHKA2	NM_001440800.1		c.2365C>T	p.Pro789Ser	missense	Exon 22 of 32	NP_001427729.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PHKA2	ENST00000379942.5	TSL:1 MANE Select	c.2365C>T	p.Pro789Ser	missense	Exon 22 of 33	ENSP00000369274.4

Frequencies

GnomAD3 genomes

AF:

0.000643

AC:

AN:

111974

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00221

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000283

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:

0.000661

GnomAD2 exomes

AF:

0.000240

AC:

AN:

183385

AF XY:

0.000118

show subpopulations

Gnomad AFR exome

AF:

0.00304

Gnomad AMR exome

AF:

0.000146

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000675

AC:

AN:

1096943

Hom.:

Cov.:

AF XY:

0.0000442

AC XY:

AN XY:

362317

show subpopulations

African (AFR)

AF:

0.00246

AC:

AN:

26370

American (AMR)

AF:

0.0000852

AC:

AN:

35206

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19376

East Asian (EAS)

AF:

0.00

AC:

AN:

30204

South Asian (SAS)

AF:

0.00

AC:

AN:

54112

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40511

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4130

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

840981

Other (OTH)

AF:

0.000130

AC:

AN:

46053

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.458

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

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

AF:

0.000643

AC:

AN:

112029

Hom.:

Cov.:

AF XY:

0.000555

AC XY:

AN XY:

34211

show subpopulations

African (AFR)

AF:

0.00220

AC:

AN:

30852

American (AMR)

AF:

0.000282

AC:

AN:

10622

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2641

East Asian (EAS)

AF:

0.00

AC:

AN:

3530

South Asian (SAS)

AF:

0.00

AC:

AN:

2665

European-Finnish (FIN)

AF:

0.00

AC:

AN:

6153

Middle Eastern (MID)

AF:

0.00

AC:

AN:

215

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

53138

Other (OTH)

AF:

0.000652

AC:

AN:

1533

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.512

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

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

Alfa

AF:

0.00104

Hom.:

Bravo

AF:

0.000744

ESP6500AA

AF:

0.00339

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000280

AC:

ClinVar

Significance: Likely benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Glycogen storage disease IXa1

Benign:1

Jan 18, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

PHKA2-related disorder

Benign:1

Mar 14, 2020

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications).

not provided

Benign:1

May 15, 2017

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Benign

-0.29

BayesDel_noAF

Benign

-0.20

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.72

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.94

M_CAP

Pathogenic

0.40

MetaRNN

Benign

0.026

MetaSVM

Uncertain

0.15

MutationAssessor

Benign

1.7

PhyloP100

1.6

PrimateAI

Benign

0.46

PROVEAN

Uncertain

-2.6

REVEL

Uncertain

0.43

Sift

Benign

0.49

Sift4G

Benign

0.87

Polyphen

0.27

Vest4

0.46

MVP

0.74

MPC

0.51

ClinPred

0.053

GERP RS

4.9

Varity_R

0.42

gMVP

0.72

Mutation Taster

=94/6

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

Details are displayed if max score is > 0.2

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

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over