rs1218491919

Positions:

• chr16-3583170-C-A
• chr16-3583170-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_032444.4(SLX4):​c.5080G>T​(p.Ala1694Ser) 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. 15/21 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. A1694V) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SLX4 NM_032444.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.39

Genes affected

SLX4 (HGNC:23845): (SLX4 structure-specific endonuclease subunit) This gene encodes a protein that functions as an assembly component of multiple structure-specific endonucleases. These endonuclease complexes are required for repair of specific types of DNA lesions and critical for cellular responses to replication fork failure. Mutations in this gene were found in patients with Fanconi anemia. [provided by RefSeq, Sep 2016]

(HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.036682546).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SLX4	NM_032444.4	c.5080G>T	p.Ala1694Ser	missense_variant	14/15	ENST00000294008.4	NP_115820.2
SLX4	XM_024450471.2	c.5080G>T	p.Ala1694Ser	missense_variant	14/15		XP_024306239.1
SLX4	XM_011522715.4	c.5077G>T	p.Ala1693Ser	missense_variant	14/15		XP_011521017.1
SLX4	XM_047434801.1	c.4078G>T	p.Ala1360Ser	missense_variant	10/11		XP_047290757.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SLX4	ENST00000294008.4	c.5080G>T	p.Ala1694Ser	missense_variant	14/15	5	NM_032444.4	ENSP00000294008	P1
	ENST00000573982.1	n.233C>A		non_coding_transcript_exon_variant	2/2	3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Fanconi anemia Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 29, 2021

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. This variant has not been reported in the literature in individuals affected with SLX4-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces alanine with serine at codon 1694 of the SLX4 protein (p.Ala1694Ser). The alanine residue is weakly conserved and there is a moderate physicochemical difference between alanine and serine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.088
BayesDel_addAF	Benign	-0.37	T
BayesDel_noAF	Benign	-0.77
CADD	Benign	0.029
DANN	Benign	0.52
DEOGEN2	Benign	0.033	T
Eigen	Benign	-1.5
Eigen_PC	Benign	-1.6
FATHMM_MKL	Benign	0.17	N
LIST_S2	Benign	0.46	T
M_CAP	Benign	0.020	T
MetaRNN	Benign	0.037	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.75	N
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.21	T
PROVEAN	Benign	-0.040	N
REVEL	Benign	0.084
Sift	Benign	0.21	T
Sift4G	Benign	0.58	T
Polyphen		0.35	B
Vest4		0.080
MutPred		0.11		Gain of relative solvent accessibility (P = 0.0082);
MVP		0.072
MPC		0.068
ClinPred		0.27	T
GERP RS		-9.5
Varity_R		0.025
gMVP		0.11

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: rs1218491919; hg19: chr16-3633171;