16-30445184-T-G

Variant names:

• chr16-30445184-T-G
• NM_012248.4:c.544A>C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_012248.4(SEPHS2):​c.544A>C​(p.Ser182Arg) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 12/18 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SEPHS2 NM_012248.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.11

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

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.08670694).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SEPHS2	NM_012248.4	c.544A>C	p.Ser182Arg	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.544A>C	p.Ser182Arg	missense_variant	Exon 1 of 1	6	NM_012248.4	ENSP00000418669.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jan 09, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.544A>C (p.S182R) alteration is located in exon 1 (coding exon 1) of the SEPHS2 gene. This alteration results from a A to C substitution at nucleotide position 544, causing the serine (S) at amino acid position 182 to be replaced by an arginine (R). 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	-0.19	T
BayesDel_noAF	Benign	-0.51
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Benign	0.0088	T
Eigen	Benign	-0.32
Eigen_PC	Benign	-0.10
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.73	T
M_CAP	Benign	0.011	T
MetaRNN	Benign	0.087	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	-0.27	N
PrimateAI	Benign	0.35	T
PROVEAN	Benign	-0.060	N
REVEL	Benign	0.028
Sift	Benign	0.20	T
Sift4G	Benign	0.35	T
Polyphen		0.0020	B
MutPred		0.40		Gain of helix (P = 0.005);
MVP		0.40
ClinPred		0.78	D
GERP RS		4.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.13

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr16-30456505;