17-1872510-T-G

Variant summary

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

The NM_002945.5(RPA1):c.438T>G(p.Asn146Lys) variant causes a missense 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. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: RPA1 NM_002945.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.260

Genes affected

RPA1 (HGNC:10289): (replication protein A1) This gene encodes the largest subunit of the heterotrimeric Replication Protein A (RPA) complex, which binds to single-stranded DNA (ssDNA), forming a nucleoprotein complex that plays an important role in DNA metabolism, being involved in DNA replication, repair, recombination, telomere maintenance, and co-ordinating the cellular response to DNA damage through activation of the ataxia telangiectasia and Rad3-related protein (ATR) kinase. The nucleoprotein complex protects the single-stranded DNA from nucleases, prevents formation of secondary structures that would interfere with repair, and co-ordinates the recruitment and departure of different genome maintenance factors. This subunit contains four oligonucleotide/oligosaccharide-binding (OB) domains, though the majority of ssDNA binding occurs in two of these domains. The heterotrimeric complex has two different modes of ssDNA binding, a low-affinity and high-affinity mode, determined by which ssDNA binding domains are utilized. The different binding modes differ in the length of DNA bound and in the proteins with which it interacts, thereby playing a role in regulating different genomic maintenance pathways. [provided by RefSeq, Sep 2017]

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=0.12515765).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RPA1	NM_002945.5	c.438T>G	p.Asn146Lys	missense_variant	6/17	ENST00000254719.10
RPA1	NM_001355120.2	c.399T>G	p.Asn133Lys	missense_variant	6/17
RPA1	NM_001355121.2	c.438T>G	p.Asn146Lys	missense_variant	6/16

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RPA1	ENST00000254719.10	c.438T>G	p.Asn146Lys	missense_variant	6/17	1	NM_002945.5	P1
RPA1	ENST00000570451.5	c.399T>G	p.Asn133Lys	missense_variant	6/7	3
RPA1	ENST00000573924.1	n.162T>G		non_coding_transcript_exon_variant	2/6	4
RPA1	ENST00000571058.5			downstream_gene_variant		4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 26, 2023

The c.438T>G (p.N146K) alteration is located in exon 6 (coding exon 6) of the RPA1 gene. This alteration results from a T to G substitution at nucleotide position 438, causing the asparagine (N) at amino acid position 146 to be replaced by a lysine (K). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.57
Cadd	Benign	11
Dann	Benign	0.95
DEOGEN2	Benign	0.022	T;T
Eigen	Benign	-0.69
Eigen_PC	Benign	-0.63
FATHMM_MKL	Benign	0.74	D
LIST_S2	Benign	0.72	T;T
M_CAP	Benign	0.022	T
MetaRNN	Benign	0.13	T;T
MetaSVM	Benign	-1.0	T
MutationTaster	Benign	0.97	D
PrimateAI	Benign	0.46	T
Sift4G	Benign	0.44	T;T
Polyphen		0.39	.;B
Vest4		0.30
MutPred		0.31		.;Gain of ubiquitination at N146 (P = 0.0104);
MVP		0.58
MPC		0.28
ClinPred		0.17	T
GERP RS		1.1
Varity_R		0.033
gMVP		0.39

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.090		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: chr17-1775804;