X-24699436-T-C

Position:

• chrX-24699436-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001330360.2(POLA1):​c.55T>C​(p.Ser19Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000943 in 1,060,934 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 22)
  • Exomes 𝑓: 9.4e-7 (0 hom. 0 hem.)
• Consequence: POLA1 NM_001330360.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.51

Genes affected

POLA1 (HGNC:9173): (DNA polymerase alpha 1, catalytic subunit) This gene encodes the catalytic subunit of DNA polymerase, which together with a regulatory and two primase subunits, forms the DNA polymerase alpha complex. The catalytic subunit plays an essential role in the initiation of DNA replication. [provided by RefSeq, Mar 2010]

POLA1 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.20359299).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
POLA1	NM_001330360.2	c.55T>C	p.Ser19Pro	missense_variant	2/37	ENST00000379068.8	NP_001317289.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
POLA1	ENST00000379068.8	c.55T>C	p.Ser19Pro	missense_variant	2/37	5	NM_001330360.2	ENSP00000368358.3

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome AF: 9.43e-7 AC: 1 AN: 1060934 Hom.: 0 Cov.: 26 AF XY: 0.00 AC XY: 0 AN XY: 335578

Gnomad4 AFR exome AF: 0.00

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 Cov.: 22

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

POLA1-related disorder Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Jun 07, 2023

The POLA1 c.37T>C variant is predicted to result in the amino acid substitution p.Ser13Pro. To our knowledge, this variant has not been reported in the literature or in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.55
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.37	.;.;T
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.56	T;T;T
M_CAP	Benign	0.0089	T
MetaRNN	Benign	0.20	T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.0	.;.;M
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	-2.2	N;.;N
REVEL	Benign	0.094
Sift	Uncertain	0.0040	D;.;D
Sift4G	Uncertain	0.028	D;D;D
Polyphen		0.97	D;.;P
Vest4		0.30
MutPred		0.22		Loss of phosphorylation at S19 (P = 0.0156);.;.;
MVP		0.41
MPC		0.53
ClinPred		0.69	D
GERP RS		3.9
Varity_R		0.41
gMVP		0.18

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

No publications associated with this variant yet.

Other links and lift over

hg19: chrX-24717553;