Genetic Variant SMAP1:p.Asp121Glu (chr6-70773374-T-G) – ACMG Classification: Likely_benign (-5 pts)

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4BS2

The NM_001044305.3(SMAP1):c.363T>G(p.Asp121Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000508 in 1,574,994 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000035 ( 0 hom. )

Consequence

SMAP1
NM_001044305.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.79

Publications

0 publications found

Variant links:

Genes affected

SMAP1 (HGNC:19651): (small ArfGAP 1) The protein encoded by this gene is similar to the mouse stromal membrane-associated protein-1. This similarity suggests that this human gene product is also a type II membrane glycoprotein involved in the erythropoietic stimulatory activity of stromal cells. Alternate splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jul 2008]

SMAP1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.32019728).

BS2

High AC in GnomAdExome4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMAP1	NM_001044305.3 link	c.363T>G	p.Asp121Glu	missense_variant	Exon 4 of 11	ENST00000370455.8	NP_001037770.1	Q8IYB5-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMAP1	ENST00000370455.8 link	c.363T>G	p.Asp121Glu	missense_variant	Exon 4 of 11	1	NM_001044305.3	ENSP00000359484.3		Q8IYB5-1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152128

Hom.:

Cov.:

show subpopulations

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:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000220

AC:

AN:

227290

AF XY:

0.0000245

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000496

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000351

AC:

AN:

1422866

Hom.:

Cov.:

AF XY:

0.00000424

AC XY:

AN XY:

707666

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32718

American (AMR)

AF:

0.00

AC:

AN:

42454

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25322

East Asian (EAS)

AF:

0.0000255

AC:

AN:

39232

South Asian (SAS)

AF:

0.00

AC:

AN:

82614

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52262

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5550

European-Non Finnish (NFE)

AF:

0.00000369

AC:

AN:

1083814

Other (OTH)

AF:

0.00

AC:

AN:

58900

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152128

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74314

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41432

American (AMR)

AF:

0.00

AC:

AN:

15268

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5198

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10606

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000441

AC:

AN:

68006

Other (OTH)

AF:

0.00

AC:

AN:

2088

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.492

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000227

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000117

AC:

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 03, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.363T>G (p.D121E) alteration is located in exon 4 (coding exon 4) of the SMAP1 gene. This alteration results from a T to G substitution at nucleotide position 363, causing the aspartic acid (D) at amino acid position 121 to be replaced by a glutamic acid (E). 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

AlphaMissense

Pathogenic

0.74

BayesDel_addAF

Benign

-0.13

BayesDel_noAF

Benign

-0.28

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.040

.;.;T;.;T

Eigen

Benign

0.084

Eigen_PC

Benign

0.060

FATHMM_MKL

Uncertain

0.79

LIST_S2

Uncertain

0.91

D;D;D;D;T

M_CAP

Benign

0.015

MetaRNN

Benign

0.32

T;T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.76

N;N;N;.;.

PhyloP100

1.8

PrimateAI

Pathogenic

0.81

PROVEAN

Uncertain

-2.4

N;N;N;.;D

REVEL

Benign

0.26

Sift

Benign

0.38

T;T;T;.;D

Sift4G

Benign

0.56

T;T;T;T;D

Polyphen

0.99

D;D;D;.;.

Vest4

0.69

MutPred

0.49

Gain of ubiquitination at K122 (P = 0.1191);Gain of ubiquitination at K122 (P = 0.1191);Gain of ubiquitination at K122 (P = 0.1191);.;.;

MVP

0.61

MPC

0.45

ClinPred

0.52

GERP RS

0.63

PromoterAI

0.019

Neutral

(source)

Varity_R

0.17

gMVP

0.30

Mutation Taster

=41/59

disease causing

(source)

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

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6-70773374-T-G

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over