NM_022464.5:c.1331G>T

Variant names:

• chr5-138947172-C-A
• rs745549568
• NM_022464.5:c.1331G>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_022464.5(SIL1):​c.1331G>T​(p.Gly444Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000547 in 1,461,350 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. G444C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: SIL1 NM_022464.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.89
• Publications: 1 publications found

Genes affected

SIL1 (HGNC:24624): (SIL1 nucleotide exchange factor) This gene encodes a resident endoplasmic reticulum (ER), N-linked glycoprotein with an N-terminal ER targeting sequence, 2 putative N-glycosylation sites, and a C-terminal ER retention signal. This protein functions as a nucleotide exchange factor for another unfolded protein response protein. Mutations in this gene have been associated with Marinesco-Sjogren syndrome. Alternate transcriptional splice variants have been characterized. [provided by RefSeq, Jul 2008]

SIL1 Gene-Disease associations (from GenCC):

• Marinesco-Sjogren syndrome

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, PanelApp Australia, G2P, Labcorp Genetics (formerly Invitae), ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_022464.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SIL1	NM_022464.5	MANE Select	c.1331G>T	p.Gly444Val	missense	Exon 10 of 10	NP_071909.1	Q9H173
	SIL1	NM_001037633.2		c.1331G>T	p.Gly444Val	missense	Exon 11 of 11	NP_001032722.1	Q9H173

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SIL1	ENST00000394817.7	TSL:1 MANE Select	c.1331G>T	p.Gly444Val	missense	Exon 10 of 10	ENSP00000378294.2	Q9H173
	SIL1	ENST00000868003.1		c.1463G>T	p.Gly488Val	missense	Exon 11 of 11	ENSP00000538062.1
	SIL1	ENST00000868009.1		c.1460G>T	p.Gly487Val	missense	Exon 11 of 11	ENSP00000538068.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000547 AC: 8 AN: 1461350 Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3 AN XY: 726980

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86250

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53030

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000630 AC: 7 AN: 1111890

Other (OTH) AF: 0.0000166 AC: 1 AN: 60376

GnomAD4 genome Cov.: 33

Alfa AF: 0.0000468 Hom.: 0

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Marinesco-Sjögren syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.26
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.030
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.33	T
Eigen	Uncertain	0.63
Eigen_PC	Uncertain	0.57
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.85	T
M_CAP	Uncertain	0.11	D
MetaRNN	Uncertain	0.68	D
MetaSVM	Uncertain	0.084	D
MutationAssessor	Uncertain	2.4	M
PhyloP100		5.9
PrimateAI	Benign	0.46	T
PROVEAN	Uncertain	-2.8	D
REVEL	Uncertain	0.42
Sift	Uncertain	0.0040	D
Sift4G	Uncertain	0.029	D
Polyphen		1.0	D
Vest4		0.62
MutPred		0.30		Loss of disorder (P = 0.0246)
MVP		0.78
MPC		0.96
ClinPred		0.95	D
GERP RS		4.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.41
gMVP		0.29
Mutation Taster		=38/62	disease causing

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

Other links and lift over

dbSNP: rs745549568; hg19: chr5-138282861;