rs1423504237

Variant names:

• chr11-6391815-C-A
• rs1423504237
• NM_000543.5:c.750C>A

Your query was ambiguous. Multiple possible variants found:

• chr11-6391815-C-A
• chr11-6391815-C-T

Variant summary

Our verdict is Pathogenic. The variant received 15 ACMG points: 15P and 0B. PS1_Very_Strong PM1 PM2 PM5 PP5

The NM_000543.5(SMPD1):​c.750C>A​(p.Ser250Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (no stars). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely pathogenic in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S250N) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 31)
• Consequence: SMPD1 NM_000543.5 missense
• Clinical Significance: Likely pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 1.77
• Publications: 0 publications found

Genes affected

SMPD1 (HGNC:11120): (sphingomyelin phosphodiesterase 1) The protein encoded by this gene is a lysosomal acid sphingomyelinase that converts sphingomyelin to ceramide. The encoded protein also has phospholipase C activity. Defects in this gene are a cause of Niemann-Pick disease type A (NPA) and Niemann-Pick disease type B (NPB). Multiple transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jul 2010]

SMPD1 Gene-Disease associations (from GenCC):

• acid sphingomyelinase deficiency

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• Niemann-Pick disease

  Inheritance: AR Classification: DEFINITIVE Submitted by: Myriad Women’s Health
• Niemann-Pick disease type A

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet, G2P
• Niemann-Pick disease type B

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Pathogenic. The variant received 15 ACMG points.

• PS1: Transcript NM_000543.5 (SMPD1) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar.
• PM1: In a hotspot region, there are 13 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in NM_000543.5
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-6391814-G-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 2939476.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP5: Variant 11-6391815-C-A is Pathogenic according to our data. Variant chr11-6391815-C-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 553926.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMPD1	NM_000543.5	c.750C>A	p.Ser250Arg	missense_variant	Exon 2 of 6	ENST00000342245.9	NP_000534.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMPD1	ENST00000342245.9	c.750C>A	p.Ser250Arg	missense_variant	Exon 2 of 6	1	NM_000543.5	ENSP00000340409.4

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 36

GnomAD4 genome Cov.: 31

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Niemann-Pick disease, type A Pathogenic:1

Sep 20, 2017

Counsyl

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

This submission and the accompanying classification are no longer maintained by the submitter. For more information on current observations and classification, please contact variantquestions@myriad.com. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.58
BayesDel_addAF	Pathogenic	0.33	D
BayesDel_noAF	Pathogenic	0.24
CADD	Benign	20
DANN	Benign	0.94
Eigen	Benign	-0.33
Eigen_PC	Benign	-0.11
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Uncertain	0.86	D;D
M_CAP	Uncertain	0.10	D
MetaRNN	Uncertain	0.68	D;D
MetaSVM	Uncertain	-0.19	T
PhyloP100		1.8
PrimateAI	Uncertain	0.71	T
PROVEAN	Benign	0.65	N;N
REVEL	Uncertain	0.48
Sift	Benign	1.0	T;T
Sift4G	Benign	0.78	T;T
Vest4		0.91
MVP		0.98
MPC		0.31
ClinPred		0.47	T
GERP RS		5.0
PromoterAI		-0.0085	Neutral
Varity_R		0.28
gMVP		0.93
Mutation Taster		=0/100	disease causing (ClinVar)

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: rs1423504237; hg19: chr11-6413045;