1-228158933-C-G

Position:

• chr1-228158933-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP5_Moderate

The NM_020435.4(GJC2):​c.1175C>G​(p.Ser392Cys) variant causes a missense change. The variant allele was found at a frequency of 0.00000145 in 1,382,354 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S392F) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: GJC2 NM_020435.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 5.70

Genes affected

GJC2 (HGNC:17494): (gap junction protein gamma 2) This gene encodes a gap junction protein. Gap junction proteins are members of a large family of homologous connexins and comprise 4 transmembrane, 2 extracellular, and 3 cytoplasmic domains. This gene plays a key role in central myelination and is involved in peripheral myelination in humans. Defects in this gene are the cause of autosomal recessive Pelizaeus-Merzbacher-like disease-1. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-228158933-C-G is Pathogenic according to our data. Variant chr1-228158933-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 435326.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GJC2	NM_020435.4	c.1175C>G	p.Ser392Cys	missense_variant	2/2	ENST00000366714.3	NP_065168.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GJC2	ENST00000366714.3	c.1175C>G	p.Ser392Cys	missense_variant	2/2	1	NM_020435.4	ENSP00000355675.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000145 AC: 2 AN: 1382354 Hom.: 0 Cov.: 33 AF XY: 0.00000293 AC XY: 2 AN XY: 683394

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: 0.00000186

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hypomyelinating leukodystrophy 2 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Jan 06, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.040
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.22	T
Eigen	Benign	0.025
Eigen_PC	Benign	-0.10
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.51	T
M_CAP	Pathogenic	0.40	D
MetaRNN	Uncertain	0.64	D
MetaSVM	Uncertain	0.50	D
MutationAssessor	Uncertain	2.1	M
PrimateAI	Uncertain	0.67	T
PROVEAN	Benign	-2.2	N
REVEL	Uncertain	0.56
Sift	Uncertain	0.0060	D
Sift4G	Uncertain	0.0090	D
Polyphen		0.99	D
Vest4		0.41
MutPred		0.37		Loss of glycosylation at S392 (P = 0.0012);
MVP		0.94
ClinPred		0.86	D
GERP RS		2.9
Varity_R		0.18
gMVP		0.45

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: rs1356633840; hg19: chr1-228346634;