X-18893569-A-C

Variant names:

• chrX-18893569-A-C
• rs1249361314
• NM_000292.3:c.3624T>G

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 2P and 7B. PM2 BP4_Strong BP6_Moderate BP7

The NM_000292.3(PHKA2):​c.3624T>G​(p.Ala1208Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000413 in 1,209,829 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 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 0.000018 (0 hom., 1 hem., cov: 23)
  • Exomes 𝑓: 0.0000027 (0 hom. 0 hem.)
• Consequence: PHKA2 NM_000292.3 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.433
• Publications: 0 publications found

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

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.63).
• BP6: Variant X-18893569-A-C is Benign according to our data. Variant chrX-18893569-A-C is described in ClinVar as Likely_benign. ClinVar VariationId is 3662399.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=0.433 with no splicing effect.

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PHKA2	NM_000292.3	MANE Select	c.3624T>G	p.Ala1208Ala	synonymous	Exon 33 of 33	NP_000283.1	P46019
	PHKA2	NM_001440805.1		c.3648T>G	p.Ala1216Ala	synonymous	Exon 33 of 33	NP_001427734.1
	PHKA2	NM_001440800.1		c.3570T>G	p.Ala1190Ala	synonymous	Exon 32 of 32	NP_001427729.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PHKA2	ENST00000379942.5	TSL:1 MANE Select	c.3624T>G	p.Ala1208Ala	synonymous	Exon 33 of 33	ENSP00000369274.4	P46019
	PHKA2-AS1	ENST00000452900.5	TSL:1	n.467+231A>C		intron	N/A
	PHKA2	ENST00000897868.1		c.3648T>G	p.Ala1216Ala	synonymous	Exon 33 of 33	ENSP00000567927.1

Frequencies

GnomAD3 genomes AF: 0.0000178 AC: 2 AN: 112508 Hom.: 0 Cov.: 23

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000188

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

GnomAD2 exomes AF: 0.00000545 AC: 1 AN: 183372 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000365

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: 0.00000273 AC: 3 AN: 1097321 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 362683

African (AFR) AF: 0.00 AC: 0 AN: 26384

American (AMR) AF: 0.0000284 AC: 1 AN: 35206

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19379

East Asian (EAS) AF: 0.00 AC: 0 AN: 30204

South Asian (SAS) AF: 0.00 AC: 0 AN: 54130

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40517

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4133

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 841300

Other (OTH) AF: 0.0000434 AC: 2 AN: 46068

GnomAD4 genome AF: 0.0000178 AC: 2 AN: 112508 Hom.: 0 Cov.: 23 AF XY: 0.0000289 AC XY: 1 AN XY: 34644

African (AFR) AF: 0.00 AC: 0 AN: 30974

American (AMR) AF: 0.000188 AC: 2 AN: 10666

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 2649

East Asian (EAS) AF: 0.00 AC: 0 AN: 3584

South Asian (SAS) AF: 0.00 AC: 0 AN: 2694

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 6218

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 239

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 53290

Other (OTH) AF: 0.00 AC: 0 AN: 1508

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000453

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	Glycogen storage disease IXa1 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.63
CADD	Benign	3.2
DANN	Benign	0.56
PhyloP100		0.43
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Mutation Taster		=100/0	polymorphism

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

Other links and lift over

dbSNP: rs1249361314; hg19: chrX-18911687;