chr4-83463535-C-T

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS2

The NM_139076.3(ABRAXAS1):c.755G>A(p.Arg252Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00126 in 1,611,772 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00081 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0013 ( 3 hom. )

Consequence

ABRAXAS1
NM_139076.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:2

Conservation

PhyloP100: 0.0180

Publications

7 publications found

Variant links:

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]

ABRAXAS1 links:

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]

MRPS18C links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.009159774).

BP6

Variant 4-83463535-C-T is Benign according to our data. Variant chr4-83463535-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 128225.

BS2

High Homozygotes in GnomAdExome4 at 3 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABRAXAS1	NM_139076.3 link	c.755G>A	p.Arg252Gln	missense_variant	Exon 8 of 9	ENST00000321945.12	NP_620775.2	Q6UWZ7-1
ABRAXAS1	NM_001345962.2 link	c.428G>A	p.Arg143Gln	missense_variant	Exon 7 of 8		NP_001332891.1	Q6UWZ7-2
ABRAXAS1	XR_001741334.3 link	n.919G>A		non_coding_transcript_exon_variant	Exon 9 of 9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ABRAXAS1	ENST00000321945.12 link	c.755G>A	p.Arg252Gln	missense_variant	Exon 8 of 9	1	NM_139076.3	ENSP00000369857.3		Q6UWZ7-1
ABRAXAS1	ENST00000611288.4 link	c.*246G>A		downstream_gene_variant		5		ENSP00000482434.1		A0A087WZ78

Frequencies

GnomAD3 genomes

AF:

0.000821

AC:

125

AN:

152190

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000290

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000196

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000283

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00157

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000703

AC:

176

AN:

250194

AF XY:

0.000724

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.000321

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000139

Gnomad NFE exome

AF:

0.00140

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00130

AC:

1904

AN:

1459464

Hom.:

Cov.:

AF XY:

0.00129

AC XY:

939

AN XY:

726042

show subpopulations

African (AFR)

AF:

0.000360

AC:

AN:

33374

American (AMR)

AF:

0.000427

AC:

AN:

44468

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26108

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39612

South Asian (SAS)

AF:

0.00

AC:

AN:

85984

European-Finnish (FIN)

AF:

0.000263

AC:

AN:

53154

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5304

European-Non Finnish (NFE)

AF:

0.00164

AC:

1823

AN:

1111210

Other (OTH)

AF:

0.000581

AC:

AN:

60250

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.446

Heterozygous variant carriers

166

250

333

416

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

140

210

280

350

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000814

AC:

124

AN:

152308

Hom.:

Cov.:

AF XY:

0.000644

AC XY:

AN XY:

74484

show subpopulations

African (AFR)

AF:

0.000265

AC:

AN:

41568

American (AMR)

AF:

0.000196

AC:

AN:

15294

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5188

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.000283

AC:

AN:

10608

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00157

AC:

107

AN:

68032

Other (OTH)

AF:

0.00

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.495

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000951

Hom.:

Bravo

AF:

0.000842

TwinsUK

AF:

0.00324

AC:

ALSPAC

AF:

0.00234

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.00140

AC:

ExAC

AF:

0.000725

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1Benign:2

May 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

ABRAXAS1: BP4, BS1 -

Mar 13, 2014

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

FAM175A has been only recently described in association with cancer predisposition and the risks are not well understood. This variant is denoted FAM175A c.755G>A at the cDNA level, p.Arg252Gln (R252Q) at the protein level, and results in the change of an Arginine to a Glutamine (CGA>CAA). This variant has not, to our knowledge, been published in the literature as pathogenic or benign. FAM175A Arg252Gln has been observed with an allele frequency of up to 0.1% in European Americans in the NHLBI Exome Sequencing Project. This variant is a semi-conservative substitution of a positive polar amino acid for a neutral polar one, altering a position that is highly variable throughout evolution and is located in the potential coiled-coil domain. In silico analyses predict this variant to have a benign effect on protein structure and function. At a molecular level, the impact of this missense variant on protein structure and function is not known and thus we consider this to be a variant of uncertain significance. Furthermore, based on the currently available information, cancer risks associated with this variant, and the FAM175A gene, remain unclear. -

Dec 16, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.057

BayesDel_addAF

Benign

-0.67

BayesDel_noAF

Benign

-0.74

CADD

Benign

2.1

(source)

DANN

Benign

0.79

DEOGEN2

Benign

0.0019

T;.

Eigen

Benign

-1.4

Eigen_PC

Benign

-1.4

FATHMM_MKL

Benign

0.0039

LIST_S2

Benign

0.68

T;T

M_CAP

Benign

0.0055

MetaRNN

Benign

0.0092

T;T

MetaSVM

Benign

-1.0

PhyloP100

0.018

PrimateAI

Benign

0.18

PROVEAN

Benign

0.55

N;N

REVEL

Benign

0.025

Sift

Benign

0.36

T;T

Sift4G

Benign

0.37

T;T

Polyphen

0.0030

B;.

Vest4

0.093

MVP

0.25

MPC

0.12

ClinPred

0.0095

GERP RS

-3.4

Varity_R

0.019

gMVP

0.083

Mutation Taster

=97/3

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over