1-183648258-C-T

Variant names:

• chr1-183648258-C-T
• rs370198309
• NM_203454.3:c.524G>A

Variant summary

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

The NM_203454.3(APOBEC4):​c.524G>A​(p.Arg175Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000576 in 1,613,980 control chromosomes in the GnomAD database, including 1 homozygotes. 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R175W) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.00020 (1 hom., cov: 32)
  • Exomes 𝑓: 0.000043 (0 hom.)
• Consequence: APOBEC4 NM_203454.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.13

Genes affected

APOBEC4 (HGNC:32152): (apolipoprotein B mRNA editing enzyme catalytic polypeptide like 4) This gene encodes a member of the AID/APOBEC family of polynucleotide (deoxy)cytidine deaminases, which convert cytidine to uridine. Other AID/APOBEC family members are involved in mRNA editing, somatic hypermutation and recombination of immunoglobulin genes, and innate immunity to retroviral infection. [provided by RefSeq, Jul 2008]

RGL1 (HGNC:30281): (ral guanine nucleotide dissociation stimulator like 1) Predicted to be involved in regulation of catalytic activity. Predicted to be located in cytosol. [provided by Alliance of Genome Resources, Apr 2022]

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=0.0955728).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
APOBEC4	NM_203454.3	c.524G>A	p.Arg175Gln	missense_variant	Exon 2 of 2	ENST00000308641.6	NP_982279.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
APOBEC4	ENST00000308641.6	c.524G>A	p.Arg175Gln	missense_variant	Exon 2 of 2	1	NM_203454.3	ENSP00000310622.4
RGL1	ENST00000304685.8	c.-33+11757C>T		intron_variant	Intron 1 of 18	1		ENSP00000303192.3
APOBEC4	ENST00000481562.1	n.246-461G>A		intron_variant	Intron 1 of 1	3

Frequencies

GnomAD3 genomes AF: 0.000197 AC: 30 AN: 152104 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00170

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000385

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.0000995 AC: 25 AN: 251306 Hom.: 0 AF XY: 0.0000663 AC XY: 9 AN XY: 135834

Gnomad AFR exome AF: 0.000185

Gnomad AMR exome AF: 0.000463

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000217

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000431 AC: 63 AN: 1461876 Hom.: 0 Cov.: 34 AF XY: 0.0000385 AC XY: 28 AN XY: 727234

Gnomad4 AFR exome AF: 0.000179

Gnomad4 AMR exome AF: 0.000358

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000126

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000324

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.000197 AC: 30 AN: 152104 Hom.: 1 Cov.: 32 AF XY: 0.000310 AC XY: 23 AN XY: 74290

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00170

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000385

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.000478

Bravo AF: 0.000110

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.0000576 AC: 7

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Dec 03, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.524G>A (p.R175Q) alteration is located in exon 2 (coding exon 1) of the APOBEC4 gene. This alteration results from a G to A substitution at nucleotide position 524, causing the arginine (R) at amino acid position 175 to be replaced by a glutamine (Q). 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	0.10
BayesDel_addAF	Benign	-0.36	T
BayesDel_noAF	Benign	-0.43
CADD	Benign	21
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.033	T
Eigen	Benign	0.067
Eigen_PC	Benign	0.15
FATHMM_MKL	Benign	0.64	D
LIST_S2	Benign	0.74	T
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.096	T
MetaSVM	Benign	-0.92	T
MutationAssessor	Benign	1.8	L
PrimateAI	Benign	0.28	T
PROVEAN	Uncertain	-2.7	D
REVEL	Benign	0.13
Sift	Benign	0.12	T
Sift4G	Benign	0.12	T
Polyphen		0.93	P
Vest4		0.13
MVP		0.43
MPC		0.20
ClinPred		0.083	T
GERP RS		4.4
Varity_R		0.20
gMVP		0.57

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

LitVar

Other links and lift over

dbSNP: rs370198309; hg19: chr1-183617393;