8-100220327-G-C

Variant names:

• chr8-100220327-G-C
• rs35252724
• NM_003114.5:c.1584G>C

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_003114.5(SPAG1):​c.1584G>C​(p.Ala528Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. A528A) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SPAG1 NM_003114.5 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.408
• Publications: 0 publications found

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]

SPAG1 Gene-Disease associations (from GenCC):

• primary ciliary dyskinesia 28

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, PanelApp Australia, G2P
• primary ciliary dyskinesia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

LOC105375669 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.51).
• BP7: Synonymous conserved (PhyloP=-0.408 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003114.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SPAG1	NM_003114.5	MANE Select	c.1584G>C	p.Ala528Ala	synonymous	Exon 13 of 19	NP_003105.2
	SPAG1	NM_001374321.1		c.1584G>C	p.Ala528Ala	synonymous	Exon 13 of 19	NP_001361250.1
	SPAG1	NM_172218.3		c.1584G>C	p.Ala528Ala	synonymous	Exon 13 of 19	NP_757367.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SPAG1	ENST00000388798.7	TSL:1 MANE Select	c.1584G>C	p.Ala528Ala	synonymous	Exon 13 of 19	ENSP00000373450.3
	SPAG1	ENST00000251809.4	TSL:5	c.1584G>C	p.Ala528Ala	synonymous	Exon 13 of 19	ENSP00000251809.3
	SPAG1	ENST00000523302.1	TSL:3	n.343-4846G>C		intron	N/A

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.51
CADD	Benign	0.86
DANN	Benign	0.61
PhyloP100		-0.41

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs35252724; hg19: chr8-101232555;