rs397518458

Variant names:

• chr8-100162282-T-G
• rs397518458
• NM_003114.5:c.2T>G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PVS1_Supporting PM2 PP5

The NM_003114.5(SPAG1):​c.2T>G​(p.Met1?) variant causes a start lost change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 33)
• Consequence: SPAG1 NM_003114.5 start_lost
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 6.13

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PVS1: Start lost variant, no pathogenic variants between lost start and next in-frame start position. Next in-frame start position is after 113 codons. Genomic position: 100177852. Lost 0.121 part of the original CDS.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 8-100162282-T-G is Pathogenic according to our data. Variant chr8-100162282-T-G is described in ClinVar as [Pathogenic]. Clinvar id is 88680.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SPAG1	NM_003114.5	c.2T>G	p.Met1?	start_lost	Exon 2 of 19	ENST00000388798.7	NP_003105.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SPAG1	ENST00000388798.7	c.2T>G	p.Met1?	start_lost	Exon 2 of 19	1	NM_003114.5	ENSP00000373450.3
SPAG1	ENST00000251809.4	c.2T>G	p.Met1?	start_lost	Exon 2 of 19	5		ENSP00000251809.3
SPAG1	ENST00000520508.5	c.2T>G	p.Met1?	start_lost	Exon 2 of 10	5		ENSP00000428070.1
SPAG1	ENST00000520643.5	c.2T>G	p.Met1?	start_lost	Exon 2 of 10	2		ENSP00000427716.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Primary ciliary dyskinesia 28 Pathogenic:1

Oct 03, 2013

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.23
CADD	Pathogenic	27
DANN	Uncertain	0.98
DEOGEN2	Benign	0.040	.;T;.;T
Eigen	Uncertain	0.58
Eigen_PC	Uncertain	0.56
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	.;D;D;.
M_CAP	Pathogenic	0.53	D
MetaRNN	Pathogenic	0.88	D;D;D;D
MetaSVM	Uncertain	-0.084	T
PROVEAN	Uncertain	-3.2	D;D;D;D
REVEL	Uncertain	0.46
Sift	Pathogenic	0.0	D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D
Polyphen		1.0	.;D;.;D
Vest4		0.94
MutPred		0.56		Loss of glycosylation at T2 (P = 0.04);Loss of glycosylation at T2 (P = 0.04);Loss of glycosylation at T2 (P = 0.04);Loss of glycosylation at T2 (P = 0.04);
MVP		0.90
ClinPred		0.96	D
GERP RS		5.8
Varity_R		0.94
gMVP		0.70

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.30		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.30		Position offset: 1

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

Publications

LitVar

Other links and lift over

dbSNP: rs397518458; hg19: chr8-101174510;