rs142674953

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The ENST00000388798.7(SPAG1):​c.2515A>T​(p.Met839Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000407 in 1,614,066 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00016 ( 0 hom., cov: 32)
Exomes 𝑓: 0.00043 ( 0 hom. )

Consequence

SPAG1
ENST00000388798.7 missense

Scores

19

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: -2.05
Variant links:
Genes affected
SPAG1 (HGNC:11212): (sperm associated antigen 1) The correlation of anti-sperm antibodies with cases of unexplained infertility implicates a role for these antibodies in blocking fertilization. Improved diagnosis and treatment of immunologic infertility, as well as identification of proteins for targeted contraception, are dependent on the identification and characterization of relevant sperm antigens. The protein expressed by this gene is recognized by anti-sperm agglutinating antibodies from an infertile woman. Furthermore, immunization of female rats with the recombinant human protein reduced fertility. This protein localizes to the plasma membrane of germ cells in the testis and to the post-acrosomal plasma membrane of mature spermatozoa. Recombinant polypeptide binds GTP and exhibits GTPase activity. Thus, this protein may regulate GTP signal transduction pathways involved in spermatogenesis and fertilization. Two transcript variants of this gene encode the same protein. [provided by RefSeq, Jul 2008]

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2
Very rare variant in population databases, with high coverage;
BP4
Computational evidence support a benign effect (MetaRNN=0.027844429).

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE Protein UniProt
SPAG1NM_003114.5 linkuse as main transcriptc.2515A>T p.Met839Leu missense_variant 18/19 ENST00000388798.7 NP_003105.2

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Protein Appris UniProt
SPAG1ENST00000388798.7 linkuse as main transcriptc.2515A>T p.Met839Leu missense_variant 18/191 NM_003114.5 ENSP00000373450 P1Q07617-1
SPAG1ENST00000251809.4 linkuse as main transcriptc.2515A>T p.Met839Leu missense_variant 18/195 ENSP00000251809 P1Q07617-1
SPAG1ENST00000519409.1 linkuse as main transcriptn.79A>T non_coding_transcript_exon_variant 1/23

Frequencies

GnomAD3 genomes
AF:
0.000164
AC:
25
AN:
152212
Hom.:
0
Cov.:
32
show subpopulations
Gnomad AFR
AF:
0.0000482
Gnomad AMI
AF:
0.00
Gnomad AMR
AF:
0.0000654
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:
0.000323
Gnomad OTH
AF:
0.00
GnomAD3 exomes
AF:
0.000151
AC:
38
AN:
251302
Hom.:
0
AF XY:
0.000140
AC XY:
19
AN XY:
135816
show subpopulations
Gnomad AFR exome
AF:
0.0000615
Gnomad AMR exome
AF:
0.0000579
Gnomad ASJ exome
AF:
0.00
Gnomad EAS exome
AF:
0.00
Gnomad SAS exome
AF:
0.00
Gnomad FIN exome
AF:
0.00
Gnomad NFE exome
AF:
0.000308
Gnomad OTH exome
AF:
0.00
GnomAD4 exome
AF:
0.000432
AC:
632
AN:
1461854
Hom.:
0
Cov.:
36
AF XY:
0.000433
AC XY:
315
AN XY:
727234
show subpopulations
Gnomad4 AFR exome
AF:
0.000179
Gnomad4 AMR exome
AF:
0.0000895
Gnomad4 ASJ exome
AF:
0.00
Gnomad4 EAS exome
AF:
0.00
Gnomad4 SAS exome
AF:
0.00
Gnomad4 FIN exome
AF:
0.0000187
Gnomad4 NFE exome
AF:
0.000523
Gnomad4 OTH exome
AF:
0.000646
GnomAD4 genome
AF:
0.000164
AC:
25
AN:
152212
Hom.:
0
Cov.:
32
AF XY:
0.000134
AC XY:
10
AN XY:
74360
show subpopulations
Gnomad4 AFR
AF:
0.0000482
Gnomad4 AMR
AF:
0.0000654
Gnomad4 ASJ
AF:
0.00
Gnomad4 EAS
AF:
0.00
Gnomad4 SAS
AF:
0.00
Gnomad4 FIN
AF:
0.00
Gnomad4 NFE
AF:
0.000323
Gnomad4 OTH
AF:
0.00
Alfa
AF:
0.000268
Hom.:
0
Bravo
AF:
0.000212
TwinsUK
AF:
0.00
AC:
0
ALSPAC
AF:
0.00104
AC:
4
ESP6500AA
AF:
0.000227
AC:
1
ESP6500EA
AF:
0.000465
AC:
4
ExAC
AF:
0.0000906
AC:
11
EpiCase
AF:
0.000382
EpiControl
AF:
0.000119

ClinVar

Significance: Uncertain significance
Submissions summary: Uncertain:3
Revision: criteria provided, multiple submitters, no conflicts
LINK: link

Submissions by phenotype

Primary ciliary dyskinesia 28 Uncertain:2
Uncertain significance, criteria provided, single submitterclinical testingLabcorp Genetics (formerly Invitae), LabcorpJul 19, 2022This sequence change replaces methionine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 839 of the SPAG1 protein (p.Met839Leu). This variant is present in population databases (rs142674953, gnomAD 0.03%). This variant has not been reported in the literature in individuals affected with SPAG1-related conditions. ClinVar contains an entry for this variant (Variation ID: 411000). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. 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. -
Uncertain significance, criteria provided, single submitterclinical testingFulgent Genetics, Fulgent GeneticsOct 19, 2021- -
Primary ciliary dyskinesia Uncertain:1
Uncertain significance, criteria provided, single submitterclinical testingAmbry GeneticsJun 18, 2024The p.M839L variant (also known as c.2515A>T), located in coding exon 17 of the SPAG1 gene, results from an A to T substitution at nucleotide position 2515. The methionine at codon 839 is replaced by leucine, an amino acid with highly similar properties. This amino acid position is poorly conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Benign
0.089
BayesDel_addAF
Benign
-0.50
T
BayesDel_noAF
Benign
-0.66
CADD
Benign
0.039
DANN
Benign
0.45
DEOGEN2
Benign
0.016
T;T
Eigen
Benign
-1.7
Eigen_PC
Benign
-1.6
FATHMM_MKL
Benign
0.053
N
LIST_S2
Benign
0.55
T;.
M_CAP
Benign
0.0095
T
MetaRNN
Benign
0.028
T;T
MetaSVM
Benign
-0.98
T
MutationAssessor
Benign
1.1
L;L
MutationTaster
Benign
1.0
N;N
PrimateAI
Benign
0.19
T
PROVEAN
Benign
-0.71
N;N
REVEL
Benign
0.037
Sift
Benign
0.55
T;T
Sift4G
Benign
0.25
T;T
Polyphen
0.0
B;B
Vest4
0.12
MutPred
0.37
Gain of ubiquitination at K844 (P = 0.0661);Gain of ubiquitination at K844 (P = 0.0661);
MVP
0.32
MPC
0.14
ClinPred
0.020
T
GERP RS
-6.5
Varity_R
0.048
gMVP
0.12

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

Below is the list of publications found by LitVar. It may be empty.

Other links and lift over

dbSNP: rs142674953; hg19: chr8-101252865; API