X-18305145-G-A

Variant names:

• chrX-18305145-G-A
• rs1428884720
• NM_006089.3:c.557C>T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PP3_Moderate BS2

The NM_006089.3(SCML2):​c.557C>T​(p.Pro186Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,096,420 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 2 hemizygotes in GnomAD. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 0.0000027 (0 hom. 2 hem.)
• Consequence: SCML2 NM_006089.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.49

Genes affected

SCML2 (HGNC:10581): (Scm polycomb group protein like 2) This gene encodes a member of the Polycomb group proteins. These proteins form the Polycomb repressive complexes which are involved in transcriptional repression. The encoded protein binds histone peptides that are monomethylated at lysine residues and may be involved in regulating homeotic gene expression during development. [provided by RefSeq, Jun 2010]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PP3: MetaRNN computational evidence supports a deleterious effect, 0.936
• BS2: High Hemizygotes in GnomAdExome4 at 2 gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SCML2	NM_006089.3	c.557C>T	p.Pro186Leu	missense_variant	Exon 7 of 15	ENST00000251900.9	NP_006080.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SCML2	ENST00000251900.9	c.557C>T	p.Pro186Leu	missense_variant	Exon 7 of 15	1	NM_006089.3	ENSP00000251900.4

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD3 exomes AF: 0.00000548 AC: 1 AN: 182545 Hom.: 0 AF XY: 0.0000149 AC XY: 1 AN XY: 67049

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000122

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 3 AN: 1096420 Hom.: 0 Cov.: 30 AF XY: 0.00000553 AC XY: 2 AN XY: 361824

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000357

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 23

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Oct 01, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.557C>T (p.P186L) alteration is located in exon 7 (coding exon 6) of the SCML2 gene. This alteration results from a C to T substitution at nucleotide position 557, causing the proline (P) at amino acid position 186 to be replaced by a leucine (L). 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	Uncertain	0.55
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.11
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.22	T
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.42	D
MetaRNN	Pathogenic	0.94	D
MetaSVM	Benign	-0.57	T
MutationAssessor	Uncertain	2.3	M
PrimateAI	Uncertain	0.60	T
PROVEAN	Pathogenic	-9.7	D
REVEL	Uncertain	0.57
Sift	Uncertain	0.0010	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.74
MutPred		0.76		Loss of ubiquitination at K183 (P = 0.0509);
MVP		0.74
MPC		1.6
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.88
gMVP		0.91

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: rs1428884720; hg19: chrX-18323265; COSMIC: COSV99319412;