14-88385837-G-C

Position:

• chr14-88385837-G-C

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2 PM5 PP3_Strong

The NM_018418.5(SPATA7):​c.19G>C​(p.Val7Leu) variant causes a missense, splice region change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V7I) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 34)
• Consequence: SPATA7 NM_018418.5 missense, splice_region
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.71

Genes affected

SPATA7 (HGNC:20423): (spermatogenesis associated 7) This gene, originally isolated from testis, is also expressed in retina. Mutations in this gene are associated with Leber congenital amaurosis and juvenile retinitis pigmentosa. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2010]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr14-88385837-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 427873.Status of the report is no_assertion_criteria_provided, 0 stars.
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SPATA7	NM_018418.5	c.19G>C	p.Val7Leu	missense_variant, splice_region_variant	1/12	ENST00000393545.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SPATA7	ENST00000393545.9	c.19G>C	p.Val7Leu	missense_variant, splice_region_variant	1/12	1	NM_018418.5	P2

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 56

GnomAD4 genome Cov.: 34

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Leber congenital amaurosis 3 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 05, 2021

This sequence change replaces valine with leucine at codon 7 of the SPATA7 protein (p.Val7Leu). The valine residue is moderately conserved and there is a small physicochemical difference between valine and leucine. This variant also falls at the last nucleotide of exon 1, which is part of the consensus splice site for this exon. 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. This variant disrupts the c.19G nucleotide in the SPATA7 gene. Other variant(s) that disrupt this nucleotide have been determined to be pathogenic (PMID: 28714225). This suggests that this nucleotide is clinically significant, and that variants that disrupt this position are likely to be disease-causing. Nucleotide substitutions within the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site, but this prediction has not been confirmed by published transcriptional studies. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant has been observed in individual(s) with clinical features of retinal dystrophy (Invitae). This variant is not present in population databases (ExAC no frequency). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.63
BayesDel_addAF	Uncertain	0.083	D
BayesDel_noAF	Benign	-0.20
CADD	Pathogenic	34
DANN	Uncertain	0.98
DEOGEN2	Benign	0.088	T
Eigen	Uncertain	0.37
Eigen_PC	Uncertain	0.40
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Benign	0.27	T
M_CAP	Uncertain	0.13	D
MetaRNN	Benign	0.28	T
MetaSVM	Benign	-1.1	T
MutationTaster	Benign	1.0	D;D;D;D
PROVEAN	Uncertain	-4.1	D
REVEL	Benign	0.13
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
MutPred		0.42		Loss of sheet (P = 0.0181);
MVP		0.38
ClinPred		0.95	D
GERP RS		4.4

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	1.0
SpliceAI score (max)		0.91		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.91		Position offset: 0

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

Publications

LitVar

Other links and lift over

dbSNP: rs371609982; hg19: chr14-88852181;