chr22-24302383-A-G

Variant names:

• chr22-24302383-A-G
• NM_015330.6:c.152A>G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_015330.6(SPECC1L):​c.152A>G​(p.Lys51Arg) 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 (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SPECC1L NM_015330.6 missense, splice_region
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.80

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:49185): (SPECC1L-ADORA2A readthrough (NMD candidate)) This locus represents naturally occurring readthrough transcription between the neighboring SPECC1L (sperm antigen with calponin homology and coiled-coil domains 1-like) and ADORA2A (adenosine A2a receptor) genes on chromosome 22. The readthrough transcript is a candidate for nonsense-mediated mRNA decay (NMD) and is unlikely to produce a protein product. [provided by RefSeq, Jun 2013]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SPECC1L	NM_015330.6	c.152A>G	p.Lys51Arg	missense_variant, splice_region_variant	Exon 3 of 17	ENST00000314328.14	NP_056145.5
SPECC1L	NM_001145468.4	c.152A>G	p.Lys51Arg	missense_variant, splice_region_variant	Exon 2 of 16		NP_001138940.4
SPECC1L	NM_001254732.3	c.152A>G	p.Lys51Arg	missense_variant, splice_region_variant	Exon 2 of 15		NP_001241661.3
SPECC1L-ADORA2A	NR_103546.1	n.460A>G		splice_region_variant, non_coding_transcript_exon_variant	Exon 3 of 20

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SPECC1L	ENST00000314328.14	c.152A>G	p.Lys51Arg	missense_variant, splice_region_variant	Exon 3 of 17	1	NM_015330.6	ENSP00000325785.8
SPECC1L-ADORA2A	ENST00000358654.2	n.152A>G		splice_region_variant, non_coding_transcript_exon_variant	Exon 3 of 20	2		ENSP00000351480.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

SPECC1L-related disorder Uncertain:1

Feb 16, 2023

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The SPECC1L c.152A>G variant is predicted to result in the amino acid substitution p.Lys51Arg. To our knowledge, this variant has not been reported in the literature or in a large population database (http://gnomad.broadinstitute.org), 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	0.10
BayesDel_addAF	Pathogenic	0.17	D
BayesDel_noAF	Uncertain	0.0
CADD	Pathogenic	28
DANN	Uncertain	1.0
Eigen	Uncertain	0.61
Eigen_PC	Uncertain	0.60
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Uncertain	0.92	.;D;.;.
M_CAP	Benign	0.052	D
MetaRNN	Benign	0.34	T;T;T;T
MetaSVM	Uncertain	-0.091	T
PrimateAI	Uncertain	0.60	T
PROVEAN	Benign	-1.1	N;N;N;N
REVEL	Benign	0.13
Sift	Benign	0.071	T;T;T;T
Sift4G	Benign	0.28	T;T;T;T
Vest4		0.43
MutPred		0.31		Loss of ubiquitination at K51 (P = 0.0034);Loss of ubiquitination at K51 (P = 0.0034);Loss of ubiquitination at K51 (P = 0.0034);Loss of ubiquitination at K51 (P = 0.0034);
MVP		0.73
MPC		1.0
ClinPred		0.94	D
GERP RS		5.3
gMVP		0.35

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.99
SpliceAI score (max)		0.54		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.54		Position offset: 1

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr22-24698351;