9-34635841-C-G

Variant names:

• chr9-34635841-C-G
• rs200076129
• NM_005866.4:c.463G>C

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_005866.4(SIGMAR1):​c.463G>C​(p.Gly155Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000657 in 152,188 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely benign in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G155W) has been classified as Uncertain significance.

• Frequency: Genomes: 𝑓 0.0000066 (0 hom., cov: 31)
• Consequence: SIGMAR1 NM_005866.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.42
• Publications: 2 publications found

Genes affected

SIGMAR1 (HGNC:8157): (sigma non-opioid intracellular receptor 1) This gene encodes a receptor protein that interacts with a variety of psychotomimetic drugs, including cocaine and amphetamines. The receptor is believed to play an important role in the cellular functions of various tissues associated with the endocrine, immune, and nervous systems. As indicated by its previous name, opioid receptor sigma 1 (OPRS1), the product of this gene was erroneously thought to function as an opioid receptor; it is now thought to be a non-opioid receptor. Mutations in this gene has been associated with juvenile amyotrophic lateral sclerosis 16. Alternative splicing of this gene results in transcript variants encoding distinct isoforms. [provided by RefSeq, Aug 2013]

SIGMAR1 Gene-Disease associations (from GenCC):

• amyotrophic lateral sclerosis type 16

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), PanelApp Australia
• autosomal recessive distal spinal muscular atrophy 2

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
• juvenile amyotrophic lateral sclerosis

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

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

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 6 uncertain in NM_005866.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11327577).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005866.4. 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
	SIGMAR1	NM_005866.4	MANE Select	c.463G>C	p.Gly155Arg	missense	Exon 4 of 4	NP_005857.1	Q99720-1
	SIGMAR1	NM_001282207.2		c.403G>C	p.Gly135Arg	missense	Exon 4 of 4	NP_001269136.1	Q99720-2
	SIGMAR1	NM_147157.3		c.370G>C	p.Gly124Arg	missense	Exon 3 of 3	NP_671513.1	Q99720-3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SIGMAR1	ENST00000277010.9	TSL:1 MANE Select	c.463G>C	p.Gly155Arg	missense	Exon 4 of 4	ENSP00000277010.4	Q99720-1
	SIGMAR1	ENST00000477726.1	TSL:1	c.370G>C	p.Gly124Arg	missense	Exon 3 of 3	ENSP00000420022.1	Q99720-3
	SIGMAR1	ENST00000353468.4	TSL:1	n.*95G>C		non_coding_transcript_exon	Exon 4 of 4	ENSP00000434453.1	Q99720-4

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152188 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 36

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152188 Hom.: 0 Cov.: 31 AF XY: 0.0000135 AC XY: 1 AN XY: 74342

African (AFR) AF: 0.00 AC: 0 AN: 41442

American (AMR) AF: 0.0000654 AC: 1 AN: 15290

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5194

South Asian (SAS) AF: 0.00 AC: 0 AN: 4828

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10612

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 314

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 68034

Other (OTH) AF: 0.00 AC: 0 AN: 2090

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.46
CADD	Benign	15
DANN	Benign	0.95
DEOGEN2	Benign	0.098	T
Eigen	Benign	-0.54
Eigen_PC	Benign	-0.52
FATHMM_MKL	Benign	0.20	N
LIST_S2	Uncertain	0.86	D
M_CAP	Benign	0.040	D
MetaRNN	Benign	0.11	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-0.40	N
PhyloP100		2.4
PrimateAI	Uncertain	0.62	T
PROVEAN	Benign	-0.75	N
REVEL	Benign	0.13
Sift	Benign	0.38	T
Sift4G	Benign	0.35	T
Polyphen		0.65	P
Vest4		0.13
MutPred		0.60		Gain of solvent accessibility (P = 0.019)
MVP		0.53
MPC		0.96
ClinPred		0.53	D
GERP RS		2.8
Varity_R		0.28
gMVP		0.80
Mutation Taster		=79/21	polymorphism

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: rs200076129; hg19: chr9-34635838;