16-3608868-C-A

Position:

• chr16-3608868-C-A

Variant summary

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

The NM_032444.4(SLX4):​c.97G>T​(p.Asp33Tyr) 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 (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SLX4 NM_032444.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.292

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]

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=0.058228463).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SLX4	NM_032444.4	c.97G>T	p.Asp33Tyr	missense_variant	2/15	ENST00000294008.4	NP_115820.2
SLX4	XM_024450471.2	c.97G>T	p.Asp33Tyr	missense_variant	2/15		XP_024306239.1
SLX4	XM_011522715.4	c.97G>T	p.Asp33Tyr	missense_variant	2/15		XP_011521017.1
SLX4	XR_007064923.1	n.746G>T		non_coding_transcript_exon_variant	2/13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SLX4	ENST00000294008.4	c.97G>T	p.Asp33Tyr	missense_variant	2/15	5	NM_032444.4	ENSP00000294008	P1
SLX4	ENST00000466154.5	n.392G>T		non_coding_transcript_exon_variant	1/7	1
SLX4	ENST00000486524.1	n.725G>T		non_coding_transcript_exon_variant	2/4	2
SLX4	ENST00000697859.1	n.719G>T		non_coding_transcript_exon_variant	2/2

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

Fanconi anemia Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 27, 2022

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 output the following: SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The tyrosine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. ClinVar contains an entry for this variant (Variation ID: 456342). This variant has not been reported in the literature in individuals affected with SLX4-related conditions. This variant is present in population databases (no rsID available, gnomAD 0.01%). This sequence change replaces aspartic acid, which is acidic and polar, with tyrosine, which is neutral and polar, at codon 33 of the SLX4 protein (p.Asp33Tyr). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.081
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.56
CADD	Benign	18
DANN	Benign	0.84
DEOGEN2	Benign	0.052	T
Eigen	Benign	-0.97
Eigen_PC	Benign	-0.96
FATHMM_MKL	Benign	0.22	N
LIST_S2	Benign	0.45	T
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.058	T
MetaSVM	Benign	-0.89	T
MutationAssessor	Benign	1.1	L
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.29	T
PROVEAN	Benign	-1.6	N
REVEL	Benign	0.051
Sift	Uncertain	0.0050	D
Sift4G	Uncertain	0.028	D
Polyphen		0.010	B
Vest4		0.28
MutPred		0.20		Gain of phosphorylation at D33 (P = 0.0142);
MVP		0.15
MPC		0.15
ClinPred		0.20	T
GERP RS		-0.67
Varity_R		0.063
gMVP		0.11

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs780117582; hg19: chr16-3658869;