22-24302318-A-T

Position:

• chr22-24302318-A-T

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 3P and 4B. PM2 PP2 BP4_Strong

The NM_015330.6(SPECC1L):​c.87A>T​(p.Glu29Asp) 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. 12/19 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: SPECC1L NM_015330.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:2
• Conservation: PhyloP100: -1.96

Genes affected

SPECC1L (HGNC:29022): (sperm antigen with calponin homology and coiled-coil domains 1 like) This gene encodes a coiled-coil domain containing protein. The encoded protein may play a critical role in actin-cytoskeletal reorganization during facial morphogenesis. Mutations in this gene are a cause of oblique facial clefting-1. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. A read-through transcript composed of SPECC1L (sperm antigen with calponin homology and coiled-coil domains 1-like) and the downstream ADORA2A (adenosine A2a receptor) gene sequence has been identified, but it is thought to be non-coding. [provided by RefSeq, Jun 2013]

SPECC1L-ADORA2A (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), SPECC1L. . Gene score misZ 1.5985 (greater than the threshold 3.09). Trascript score misZ 3.1934 (greater than threshold 3.09). GenCC has associacion of gene with autosomal dominant Opitz G/BBB syndrome, hypertelorism, Teebi type, commissural facial cleft, Tessier number 4 facial cleft.
• BP4: Computational evidence support a benign effect (MetaRNN=0.034600794).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SPECC1L	NM_015330.6	c.87A>T	p.Glu29Asp	missense_variant	3/17	ENST00000314328.14
SPECC1L-ADORA2A	NR_103546.1	n.395A>T		non_coding_transcript_exon_variant	3/20
SPECC1L	NM_001145468.4	c.87A>T	p.Glu29Asp	missense_variant	2/16
SPECC1L	NM_001254732.3	c.87A>T	p.Glu29Asp	missense_variant	2/15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SPECC1L	ENST00000314328.14	c.87A>T	p.Glu29Asp	missense_variant	3/17	1	NM_015330.6	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Eurofins Ntd Llc (ga)

Apr 18, 2017

- -

SPECC1L-related disorder Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Apr 18, 2024

The SPECC1L c.87A>T variant is predicted to result in the amino acid substitution p.Glu29Asp. To our knowledge, this variant has not been reported in the literature or in a large population database, indicating this variant is rare. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.070
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.47
CADD	Benign	1.9
DANN	Uncertain	0.98
Eigen	Benign	-1.6
Eigen_PC	Benign	-1.7
FATHMM_MKL	Benign	0.062	N
LIST_S2	Benign	0.79	.;T;.;.
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.035	T;T;T;T
MetaSVM	Benign	-1.1	T
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Uncertain	0.53	T
PROVEAN	Benign	-0.67	N;N;N;N
REVEL	Benign	0.073
Sift	Benign	0.083	T;T;T;T
Sift4G	Benign	0.32	T;T;T;T
Vest4		0.13
MutPred		0.058		Loss of methylation at K27 (P = 0.1025);Loss of methylation at K27 (P = 0.1025);Loss of methylation at K27 (P = 0.1025);Loss of methylation at K27 (P = 0.1025);
MVP		0.49
MPC		0.35
ClinPred		0.092	T
GERP RS		-10
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
gMVP		0.099

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: rs1556181412; hg19: chr22-24698286;