chr4-83462482-G-A

Variant names:

• chr4-83462482-G-A
• rs1325575122
• NM_139076.3:c.1217C>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_139076.3(ABRAXAS1):​c.1217C>T​(p.Ser406Phe) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,459,192 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. S406Y) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: ABRAXAS1 NM_139076.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.17
• Publications: 0 publications found

Genes affected

ABRAXAS1 (HGNC:25829): (abraxas 1, BRCA1 A complex subunit) This gene encodes a protein that binds to the C-terminal repeats of breast cancer 1 (BRCA1) through a phospho-SXXF motif. The encoded protein recruits ubiquitin interaction motif containing 1 protein to BRCA1 protein and is required for DNA damage resistance, DNA repair, and cell cycle checkpoint control. Pseudogenes of this gene are found on chromosomes 3 and 8. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2016]

MRPS18C (HGNC:16633): (mitochondrial ribosomal protein S18C) Mammalian mitochondrial ribosomal proteins are encoded by nuclear genes and help in protein synthesis within the mitochondrion. Mitochondrial ribosomes (mitoribosomes) consist of a small 28S subunit and a large 39S subunit. They have an estimated 75% protein to rRNA composition compared to prokaryotic ribosomes, where this ratio is reversed. Another difference between mammalian mitoribosomes and prokaryotic ribosomes is that the latter contain a 5S rRNA. Among different species, the proteins comprising the mitoribosome differ greatly in sequence, and sometimes in biochemical properties, which prevents easy recognition by sequence homology. This gene encodes a 28S subunit protein that belongs to the ribosomal protein S18P family. The encoded protein is one of three that has significant sequence similarity to bacterial S18 proteins. The primary sequences of the three human mitochondrial S18 proteins are no more closely related to each other than they are to the prokaryotic S18 proteins. Pseudogenes corresponding to this gene are found on chromosomes 8p, 12p, 15q, and 22q. [provided by RefSeq, Jul 2008]

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_139076.3. 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
	ABRAXAS1	NM_139076.3	MANE Select	c.1217C>T	p.Ser406Phe	missense	Exon 9 of 9	NP_620775.2	Q6UWZ7-1
	ABRAXAS1	NM_001345962.2		c.890C>T	p.Ser297Phe	missense	Exon 8 of 8	NP_001332891.1	Q6UWZ7-2
	MRPS18C	NM_016067.4	MANE Select	c.*1285G>A		downstream_gene	N/A	NP_057151.1	Q9Y3D5

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ABRAXAS1	ENST00000321945.12	TSL:1 MANE Select	c.1217C>T	p.Ser406Phe	missense	Exon 9 of 9	ENSP00000369857.3	Q6UWZ7-1
	ABRAXAS1	ENST00000856950.1		c.1205C>T	p.Ser402Phe	missense	Exon 9 of 9	ENSP00000527009.1
	ABRAXAS1	ENST00000856949.1		c.1097C>T	p.Ser366Phe	missense	Exon 8 of 8	ENSP00000527008.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1459192 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 725768

African (AFR) AF: 0.00 AC: 0 AN: 33276

American (AMR) AF: 0.00 AC: 0 AN: 44254

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26006

East Asian (EAS) AF: 0.00 AC: 0 AN: 39658

South Asian (SAS) AF: 0.00 AC: 0 AN: 85808

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53318

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5748

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1110870

Other (OTH) AF: 0.0000332 AC: 2 AN: 60254

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.48
BayesDel_addAF	Uncertain	0.15	D
BayesDel_noAF	Uncertain	-0.030
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.10	T
Eigen	Pathogenic	0.74
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Benign	0.83	T
M_CAP	Benign	0.056	D
MetaRNN	Uncertain	0.70	D
MetaSVM	Uncertain	-0.25	T
PhyloP100		6.2
PrimateAI	Benign	0.45	T
PROVEAN	Uncertain	-3.2	D
REVEL	Benign	0.27
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.72
MutPred		0.18		Gain of glycosylation at S406 (P = 0.0014)
MVP		0.72
MPC		0.54
ClinPred		0.99	D
GERP RS		5.2
Varity_R		0.50
gMVP		0.51
Mutation Taster		=71/29	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: rs1325575122; hg19: chr4-84383635;