2-17707318-G-A

Variant summary

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

The NM_001142286.2(SMC6):c.1907C>T(p.Ala636Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000207 in 1,451,138 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: SMC6 NM_001142286.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.27

Genes affected

SMC6 (HGNC:20466): (structural maintenance of chromosomes 6) Enables ubiquitin protein ligase binding activity. Involved in several processes, including cellular senescence; positive regulation of chromosome segregation; and telomere maintenance via recombination. Located in chromosome and nuclear body. Part of Smc5-Smc6 complex. [provided by Alliance of Genome Resources, Apr 2022]

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/exons	MANE	UniProt
SMC6	NM_001142286.2	c.1907C>T	p.Ala636Val	missense_variant	18/28	ENST00000448223.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMC6	ENST00000448223.7	c.1907C>T	p.Ala636Val	missense_variant	18/28	1	NM_001142286.2	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000207 AC: 3 AN: 1451138 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 721904

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: 0.00000181

Gnomad4 OTH exome AF: 0.0000167

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 01, 2024

The c.1907C>T (p.A636V) alteration is located in exon 18 (coding exon 16) of the SMC6 gene. This alteration results from a C to T substitution at nucleotide position 1907, causing the alanine (A) at amino acid position 636 to be replaced by a valine (V). 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	0.72
BayesDel_addAF	Benign	-0.047	T
BayesDel_noAF	Benign	-0.31
Cadd	Pathogenic	26
Dann	Uncertain	1.0
DEOGEN2	Benign	0.25	T;T;T;.
Eigen	Uncertain	0.55
Eigen_PC	Uncertain	0.61
FATHMM_MKL	Pathogenic	0.98	D
M_CAP	Benign	0.018	T
MetaRNN	Uncertain	0.45	T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.8	L;L;L;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.70	T
PROVEAN	Benign	-1.7	N;N;N;N
REVEL	Benign	0.12
Sift	Benign	0.26	T;T;T;T
Sift4G	Benign	0.34	T;T;T;T
Polyphen		0.87	P;P;P;P
Vest4		0.51
MutPred		0.45		Gain of methylation at K631 (P = 0.0698);Gain of methylation at K631 (P = 0.0698);Gain of methylation at K631 (P = 0.0698);.;
MVP		0.49
MPC		0.90
ClinPred		0.81	D
GERP RS		5.1
Varity_R		0.18
gMVP		0.86

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-17888585;