7-76397779-C-G

Variant names:

• chr7-76397779-C-G
• ENST00000336517.8:c.-85C>G

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_080744.2(SSC4D):​c.607G>C​(p.Glu203Gln) variant causes a missense change involving the alteration of a conserved nucleotide. 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: SSC4D NM_080744.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.87
• Publications: 0 publications found

Genes affected

ZP3 (HGNC:13189): (zona pellucida glycoprotein 3) The zona pellucida is an extracellular matrix that surrounds the oocyte and early embryo. It is composed primarily of three or four glycoproteins with various functions during fertilization and preimplantation development. The protein encoded by this gene is a structural component of the zona pellucida and functions in primary binding and induction of the sperm acrosome reaction. The nascent protein contains a N-terminal signal peptide sequence, a conserved ZP domain, a C-terminal consensus furin cleavage site, and a transmembrane domain. It is hypothesized that furin cleavage results in release of the mature protein from the plasma membrane for subsequent incorporation into the zona pellucida matrix. However, the requirement for furin cleavage in this process remains controversial based on mouse studies. A variation in the last exon of this gene has previously served as the basis for an additional ZP3 locus; however, sequence and literature review reveals that there is only one full-length ZP3 locus in the human genome. Another locus encoding a bipartite transcript designated POMZP3 contains a duplication of the last four exons of ZP3, including the above described variation, and maps closely to this gene. [provided by RefSeq, Jul 2008]

SSC4D (HGNC:14461): (scavenger receptor cysteine rich family member with 4 domains) The scavenger receptor cysteine-rich (SRCR) superfamily is an ancient and highly conserved group of cell surface and/or secreted proteins, some of which are involved in the development of the immune system and the regulation of both innate and adaptive immune responses. Group B SRCR domains usually contain 8 regularly spaced cysteines that give rise to a well-defined intradomain disulfide-bond pattern.[supplied by OMIM, Apr 2004]

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.926

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SSC4D	NM_080744.2	c.607G>C	p.Glu203Gln	missense_variant	Exon 6 of 11	ENST00000275560.4	NP_542782.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ZP3	ENST00000336517.8	c.-85C>G		5_prime_UTR_premature_start_codon_gain_variant	Exon 1 of 9	1		ENSP00000337310.4
SSC4D	ENST00000275560.4	c.607G>C	p.Glu203Gln	missense_variant	Exon 6 of 11	1	NM_080744.2	ENSP00000275560.3
ZP3	ENST00000336517.8	c.-85C>G		5_prime_UTR_variant	Exon 1 of 9	1		ENSP00000337310.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Oct 07, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.607G>C (p.E203Q) alteration is located in exon 6 (coding exon 5) of the SSC4D gene. This alteration results from a G to C substitution at nucleotide position 607, causing the glutamic acid (E) at amino acid position 203 to be replaced by a glutamine (Q). 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	0.81
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.030
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Benign	0.21	T
Eigen	Pathogenic	0.90
Eigen_PC	Pathogenic	0.80
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.92	D
M_CAP	Uncertain	0.093	D
MetaRNN	Pathogenic	0.93	D
MetaSVM	Uncertain	-0.022	T
MutationAssessor	Pathogenic	3.0	M
PhyloP100		7.9
PrimateAI	Uncertain	0.60	T
PROVEAN	Uncertain	-2.8	D
REVEL	Uncertain	0.54
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.020	D
Polyphen		1.0	D
Vest4		0.94
MutPred		0.78		Loss of methylation at R201 (P = 0.0837);
MVP		0.73
MPC		1.5
ClinPred		1.0	D
GERP RS		4.9
PromoterAI		0.0078	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.53
gMVP		0.91
Mutation Taster		=190/110	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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

hg19: chr7-76027096;