chrX-18893485-C-G
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Variant summary
Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PM4
The NM_000292.3(PHKA2):c.3708G>C(p.Ter1236TyrextTer17) variant causes a stop lost change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).
Frequency
Genomes: not found (cov: 23)
Consequence
PHKA2
NM_000292.3 stop_lost
NM_000292.3 stop_lost
Scores
5
Clinical Significance
Conservation
PhyloP100: 0.0200
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]
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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;
PM4
Stoplost variant in NM_000292.3 Downstream stopcodon found after 56 codons.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
PHKA2 | NM_000292.3 | c.3708G>C | p.Ter1236TyrextTer17 | stop_lost | 33/33 | ENST00000379942.5 | |
PHKA2-AS1 | NR_029379.1 | n.467+147C>G | intron_variant, non_coding_transcript_variant |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
PHKA2 | ENST00000379942.5 | c.3708G>C | p.Ter1236TyrextTer17 | stop_lost | 33/33 | 1 | NM_000292.3 | P1 | |
PHKA2-AS1 | ENST00000452900.5 | n.467+147C>G | intron_variant, non_coding_transcript_variant | 1 |
Frequencies
GnomAD3 genomes Cov.: 23
GnomAD3 genomes
Cov.:
23
GnomAD4 exome Cov.: 29
GnomAD4 exome
Cov.:
29
GnomAD4 genome Cov.: 23
GnomAD4 genome
Cov.:
23
ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Glycogen storage disease IXa1 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Jan 19, 2022 | In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. ClinVar contains an entry for this variant (Variation ID: 943259). This protein extension has been observed in individual(s) with clinical features of PHKA2-related conditions (Invitae). This variant is not present in population databases (gnomAD no frequency). This sequence change disrupts the translational stop signal of the PHKA2 mRNA. It is expected to extend the length of the PHKA2 protein by 17 additional amino acid residues. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Benign
T
BayesDel_noAF
Benign
CADD
Benign
DANN
Benign
FATHMM_MKL
Benign
N
MutationTaster
Benign
N
Vest4
GERP RS
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at