7-123953815-A-G

Variant names:

• chr7-123953815-A-G
• rs899226855
• NM_153189.3:c.245A>G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 4P and 4B. PM1 PM2 BP4_Strong

The NM_153189.3(SPAM1):​c.245A>G​(p.Asn82Ser) variant causes a missense 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. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SPAM1 NM_153189.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.08

Genes affected

SPAM1 (HGNC:11217): (sperm adhesion molecule 1) Hyaluronidase degrades hyaluronic acid, a major structural proteoglycan found in extracellular matrices and basement membranes. Six members of the hyaluronidase family are clustered into two tightly linked groups on chromosome 3p21.3 and 7q31.3. This gene was previously referred to as HYAL1 and HYA1 and has since been assigned the official symbol SPAM1; another family member on chromosome 3p21.3 has been assigned HYAL1. This gene encodes a GPI-anchored enzyme located on the human sperm surface and inner acrosomal membrane. This multifunctional protein is a hyaluronidase that enables sperm to penetrate through the hyaluronic acid-rich cumulus cell layer surrounding the oocyte, a receptor that plays a role in hyaluronic acid induced cell signaling, and a receptor that is involved in sperm-zona pellucida adhesion. Abnormal expression of this gene in tumors has implicated this protein in degradation of basement membranes leading to tumor invasion and metastasis. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Mar 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM1: In a glycosylation_site N-linked (GlcNAc...) asparagine (size 0) in uniprot entity HYALP_HUMAN
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.053014368).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SPAM1	NM_153189.3	c.245A>G	p.Asn82Ser	missense_variant	Exon 3 of 5	ENST00000682466.1	NP_694859.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SPAM1	ENST00000682466.1	c.245A>G	p.Asn82Ser	missense_variant	Exon 3 of 5		NM_153189.3	ENSP00000508393.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Bravo AF: 0.0000113

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jul 06, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.245A>G (p.N82S) alteration is located in exon 3 (coding exon 1) of the SPAM1 gene. This alteration results from a A to G substitution at nucleotide position 245, causing the asparagine (N) at amino acid position 82 to be replaced by a serine (S). 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	Benign	0.083
BayesDel_addAF	Benign	-0.42	T
BayesDel_noAF	Benign	-0.84
CADD	Benign	0.0070
DANN	Benign	0.22
DEOGEN2	Benign	0.20	T;.;T;T;.
Eigen	Benign	-1.6
Eigen_PC	Benign	-1.8
FATHMM_MKL	Benign	0.021	N
LIST_S2	Benign	0.52	.;.;.;T;T
M_CAP	Benign	0.0037	T
MetaRNN	Benign	0.053	T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.73	N;N;N;N;N
PrimateAI	Benign	0.23	T
PROVEAN	Benign	-0.39	N;N;N;N;N
REVEL	Benign	0.14
Sift	Benign	1.0	T;T;T;T;T
Sift4G	Benign	0.78	T;T;T;T;T
Polyphen		0.0050	B;.;B;B;.
Vest4		0.061
MutPred		0.28		Gain of disorder (P = 0.0589);Gain of disorder (P = 0.0589);Gain of disorder (P = 0.0589);Gain of disorder (P = 0.0589);Gain of disorder (P = 0.0589);
MVP		0.20
MPC		0.091
ClinPred		0.049	T
GERP RS		-12
Varity_R		0.037
gMVP		0.32

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

Other links and lift over

dbSNP: rs899226855; hg19: chr7-123593869;