16-30445640-G-C

Variant names:

• chr16-30445640-G-C
• rs984116593
• NM_012248.4:c.88C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_012248.4(SEPHS2):​c.88C>G​(p.Arg30Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000013 in 1,534,346 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. 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. R30W) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: SEPHS2 NM_012248.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.11
• Publications: 0 publications found

Genes affected

SEPHS2 (HGNC:19686): (selenophosphate synthetase 2) This gene encodes an enzyme that catalyzes the production of monoselenophosphate (MSP) from selenide and ATP. MSP is the selenium donor required for synthesis of selenocysteine (Sec), which is co-translationally incorporated into selenoproteins at in-frame UGA codons that normally signal translation termination. The 3' UTRs of selenoprotein mRNAs contain a conserved stem-loop structure, the Sec insertion sequence (SECIS) element, which is necessary for the recognition of UGA as a Sec codon rather than as a stop signal. This protein is itself a selenoprotein containing a Sec residue at its active site, suggesting the existence of an autoregulatory mechanism. It is preferentially expressed in tissues implicated in the synthesis of selenoproteins and in sites of blood cell development. A pseudogene for this locus has been identified on chromosome 5. [provided by RefSeq, May 2017]

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11002675).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SEPHS2	NM_012248.4	c.88C>G	p.Arg30Gly	missense_variant	Exon 1 of 1	ENST00000478753.5	NP_036380.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SEPHS2	ENST00000478753.5	c.88C>G	p.Arg30Gly	missense_variant	Exon 1 of 1	6	NM_012248.4	ENSP00000418669.3

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152226 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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: 0.000478

GnomAD4 exome AF: 7.24e-7 AC: 1 AN: 1382120 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 681940

African (AFR) AF: 0.00 AC: 0 AN: 31260

American (AMR) AF: 0.0000280 AC: 1 AN: 35660

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25072

East Asian (EAS) AF: 0.00 AC: 0 AN: 35546

South Asian (SAS) AF: 0.00 AC: 0 AN: 79186

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 35830

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4174

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1077810

Other (OTH) AF: 0.00 AC: 0 AN: 57582

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152226 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 74372

African (AFR) AF: 0.00 AC: 0 AN: 41464

American (AMR) AF: 0.00 AC: 0 AN: 15284

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3466

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

South Asian (SAS) AF: 0.00 AC: 0 AN: 4836

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10628

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

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

Other (OTH) AF: 0.000478 AC: 1 AN: 2092

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Mar 31, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.88C>G (p.R30G) alteration is located in exon 1 (coding exon 1) of the SEPHS2 gene. This alteration results from a C to G substitution at nucleotide position 88, causing the arginine (R) at amino acid position 30 to be replaced by a glycine (G). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.49
CADD	Benign	17
DANN	Uncertain	0.98
DEOGEN2	Benign	0.012	T
Eigen	Benign	-0.62
Eigen_PC	Benign	-0.48
FATHMM_MKL	Benign	0.14	N
LIST_S2	Benign	0.47	T
M_CAP	Benign	0.055	D
MetaRNN	Benign	0.11	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.81	L
PhyloP100		1.1
PrimateAI	Uncertain	0.64	T
PROVEAN	Benign	-0.98	N
REVEL	Benign	0.084
Sift	Uncertain	0.0050	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.039	B
Vest4		0.13
MutPred		0.43		Loss of methylation at R30 (P = 0.0317);
MVP		0.46
ClinPred		0.24	T
GERP RS		4.2
PromoterAI		-0.12	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.11

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: rs984116593; hg19: chr16-30456961;