1-47251308-C-T

Position:

• chr1-47251308-C-T

Variant summary

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

The ENST00000371877.8(STIL):​c.3695G>A​(p.Arg1232Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000106 in 1,613,954 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.00040 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000075 (0 hom.)
• Consequence: STIL ENST00000371877.8 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.47

Genes affected

STIL (HGNC:10879): (STIL centriolar assembly protein) This gene encodes a cytoplasmic protein implicated in regulation of the mitotic spindle checkpoint, a regulatory pathway that monitors chromosome segregation during cell division to ensure the proper distribution of chromosomes to daughter cells. The protein is phosphorylated in mitosis and in response to activation of the spindle checkpoint, and disappears when cells transition to G1 phase. It interacts with a mitotic regulator, and its expression is required to efficiently activate the spindle checkpoint. It is proposed to regulate Cdc2 kinase activity during spindle checkpoint arrest. Chromosomal deletions that fuse this gene and the adjacent locus commonly occur in T cell leukemias, and are thought to arise through illegitimate V-(D)-J recombination events. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

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=0.024997443).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
STIL	NM_001048166.1	c.3695G>A	p.Arg1232Gln	missense_variant	17/17	ENST00000371877.8	NP_001041631.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
STIL	ENST00000371877.8	c.3695G>A	p.Arg1232Gln	missense_variant	17/17	1	NM_001048166.1	ENSP00000360944	P5

Frequencies

GnomAD3 genomes AF: 0.000401 AC: 61 AN: 152136 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00128

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000829

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.000179 AC: 45 AN: 251364 Hom.: 0 AF XY: 0.000199 AC XY: 27 AN XY: 135848

Gnomad AFR exome AF: 0.00160

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000523

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000753 AC: 110 AN: 1461700 Hom.: 0 Cov.: 30 AF XY: 0.0000784 AC XY: 57 AN XY: 727114

Gnomad4 AFR exome AF: 0.00146

Gnomad4 AMR exome AF: 0.0000224

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000487

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000135

Gnomad4 OTH exome AF: 0.0000497

GnomAD4 genome AF: 0.000401 AC: 61 AN: 152254 Hom.: 0 Cov.: 33 AF XY: 0.000376 AC XY: 28 AN XY: 74454

Gnomad4 AFR AF: 0.00128

Gnomad4 AMR AF: 0.000131

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000830

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.000131 Hom.: 0

Bravo AF: 0.000548

ESP6500AA AF: 0.00136 AC: 6

ESP6500EA AF: 0.00 AC: 0

ExAC AF: 0.000231 AC: 28

Asia WGS AF: 0.00115 AC: 4 AN: 3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 29, 2022

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 1231 of the STIL protein (p.Arg1231Gln). This variant is present in population databases (rs148592489, gnomAD 0.2%). This variant has not been reported in the literature in individuals affected with STIL-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	-0.43	T
BayesDel_noAF	Benign	-0.41
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.22	T;.;.;.
Eigen	Uncertain	0.42
Eigen_PC	Uncertain	0.40
FATHMM_MKL	Uncertain	0.85	D
LIST_S2	Benign	0.80	T;T;T;T
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.025	T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.5	M;.;.;.
MutationTaster	Benign	1.0	N;N;N;N;N
PrimateAI	Benign	0.29	T
PROVEAN	Benign	-0.77	N;.;N;N
REVEL	Benign	0.13
Sift	Benign	0.20	T;.;T;T
Sift4G	Benign	0.37	T;T;T;T
Polyphen		1.0	D;.;D;D
Vest4		0.21
MVP		0.53
MPC		0.53
ClinPred		0.087	T
GERP RS		5.1
Varity_R		0.032
gMVP		0.13

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: rs148592489; hg19: chr1-47716980; COSMIC: COSV54549361;