rs1554851718

Positions:

• chr10-89010783-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 5P and 1B. PM1 PM2 PP5 BP4

The NM_000043.6(FAS):​c.536T>G​(p.Leu179Arg) 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. 12/20 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: not found (cov: 33)
• Consequence: FAS NM_000043.6 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2 U:1
• Conservation: PhyloP100: -0.427

Genes affected

FAS (HGNC:11920): (Fas cell surface death receptor) The protein encoded by this gene is a member of the TNF-receptor superfamily. This receptor contains a death domain. It has been shown to play a central role in the physiological regulation of programmed cell death, and has been implicated in the pathogenesis of various malignancies and diseases of the immune system. The interaction of this receptor with its ligand allows the formation of a death-inducing signaling complex that includes Fas-associated death domain protein (FADD), caspase 8, and caspase 10. The autoproteolytic processing of the caspases in the complex triggers a downstream caspase cascade, and leads to apoptosis. This receptor has been also shown to activate NF-kappaB, MAPK3/ERK1, and MAPK8/JNK, and is found to be involved in transducing the proliferating signals in normal diploid fibroblast and T cells. Several alternatively spliced transcript variants have been described, some of which are candidates for nonsense-mediated mRNA decay (NMD). The isoforms lacking the transmembrane domain may negatively regulate the apoptosis mediated by the full length isoform. [provided by RefSeq, Mar 2011]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 5 uncertain in NM_000043.6
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 10-89010783-T-G is Pathogenic according to our data. Variant chr10-89010783-T-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 523313.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=2, Uncertain_significance=1}.
• BP4: Computational evidence support a benign effect (MetaRNN=0.1901528). . Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FAS	NM_000043.6	c.536T>G	p.Leu179Arg	missense_variant	6/9	ENST00000652046.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FAS	ENST00000652046.1	c.536T>G	p.Leu179Arg	missense_variant	6/9		NM_000043.6	A2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Splenomegaly Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Jan 01, 2017

- -

Autoimmune lymphoproliferative syndrome type 1 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 19, 2022

In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt FAS protein function. ClinVar contains an entry for this variant (Variation ID: 523313). This missense change has been observed in individual(s) with autoimmune lymphoproliferative syndrome (ALPS) (Invitae). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces leucine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 179 of the FAS protein (p.Leu179Arg). -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Oct 01, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.57
BayesDel_addAF	Uncertain	0.057	T
BayesDel_noAF	Benign	-0.16
CADD	Benign	14
DANN	Benign	0.72
DEOGEN2	Uncertain	0.56	D;.;.
Eigen	Benign	-0.56
Eigen_PC	Benign	-0.85
FATHMM_MKL	Benign	0.033	N
LIST_S2	Benign	0.62	T;T;T
M_CAP	Benign	0.048	D
MetaRNN	Benign	0.19	T;T;T
MetaSVM	Uncertain	-0.0039	T
MutationAssessor	Benign	1.7	L;.;L
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Benign	0.26	T
PROVEAN	Benign	-2.1	N;N;N
REVEL	Uncertain	0.31
Sift	Benign	0.039	D;D;D
Sift4G	Uncertain	0.0090	D;D;D
Polyphen		0.94	P;.;.
Vest4		0.30
MutPred		0.54		Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);
MVP		0.46
MPC		1.0
ClinPred		0.57	D
GERP RS		0.59
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.48

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.19		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: rs1554851718; hg19: chr10-90770540;