rs767558735

Variant names:

• chr7-93105638-G-A
• rs767558735
• NM_017654.4:c.460C>T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PVS1_Strong

The NM_017654.4(SAMD9):​c.460C>T​(p.Gln154*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000547 in 1,461,806 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: SAMD9 NM_017654.4 stop_gained
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:3
• Conservation: PhyloP100: 0.639

Genes affected

SAMD9 (HGNC:1348): (sterile alpha motif domain containing 9) This gene encodes a sterile alpha motif domain-containing protein. The encoded protein localizes to the cytoplasm and may play a role in regulating cell proliferation and apoptosis. Mutations in this gene are the cause of normophosphatemic familial tumoral calcinosis. Alternate splicing results in multiple transcript variants that encode the same protein.[provided by RefSeq, Jul 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 10 pathogenic variants in the truncated region.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SAMD9	NM_017654.4	c.460C>T	p.Gln154*	stop_gained	Exon 3 of 3	ENST00000379958.3	NP_060124.2
SAMD9	NM_001193307.2	c.460C>T	p.Gln154*	stop_gained	Exon 2 of 2		NP_001180236.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SAMD9	ENST00000379958.3	c.460C>T	p.Gln154*	stop_gained	Exon 3 of 3	1	NM_017654.4	ENSP00000369292.2
SAMD9	ENST00000620985.4	c.460C>T	p.Gln154*	stop_gained	Exon 2 of 2	2		ENSP00000484636.1
SAMD9	ENST00000446617.1	c.460C>T	p.Gln154*	stop_gained	Exon 2 of 2	2		ENSP00000414529.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000796 AC: 2 AN: 251268 Hom.: 0 AF XY: 0.0000147 AC XY: 2 AN XY: 135812

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000109

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000547 AC: 8 AN: 1461806 Hom.: 0 Cov.: 35 AF XY: 0.00000688 AC XY: 5 AN XY: 727198

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000671

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000101

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000187

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Pathogenic:1 Uncertain:1

Jan 08, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Gln154*) in the SAMD9 gene. While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 1436 amino acid(s) of the SAMD9 protein. This variant is present in population databases (rs767558735, gnomAD 0.01%). This premature translational stop signal has been observed in individual(s) with myelodysplastic syndrome (PMID: 30322869). ClinVar contains an entry for this variant (Variation ID: 225463). 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. -

Feb 09, 2023

GeneDx

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Identified along with a second variant in SAMD9 in a patient with familial myelodysplastic syndrome in the published literature; however, segregation analysis was not performed (Nagata et al., 2018); Nonsense variant in the C-terminus predicted to result in protein truncation, as the last 1436 amino acids are lost, and other loss-of-function variants have been reported downstream in the Human Gene Mutation Database (HGMD); Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 16960814, 18094730, 30322869, 24077912, 28545555) -

Normophosphatemic familial tumoral calcinosis;C4284088:MIRAGE syndrome;C5436668:Monosomy 7 myelodysplasia and leukemia syndrome 2 Uncertain:1

Apr 15, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Normophosphatemic familial tumoral calcinosis Uncertain:1

Mar 18, 2016

Soonchunhyang University Bucheon Hospital, Soonchunhyang University Medical Center

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: reference population

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.052	T
BayesDel_noAF	Uncertain	0.060
CADD	Pathogenic	29
DANN	Uncertain	1.0
Eigen	Benign	0.049
Eigen_PC	Benign	-0.29
FATHMM_MKL	Benign	0.18	N
Vest4		0.53
GERP RS		3.2

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: rs767558735; hg19: chr7-92734951;