GJA8 p.Ser276Phe

Variant names:

• chr1-147908782-C-T
• rs45619342
• NM_005267.5:c.827C>T
• GJA8 p.Ser276Phe

Your query was ambiguous. Multiple possible variants found:

• chr1-147908782-C-T
• chr1-147908782-CC-TT

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_005267.5(GJA8):​c.827C>T​(p.Ser276Phe) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: GJA8 NM_005267.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: 5.95
• Publications: 21 publications found

Genes affected

GJA8 (HGNC:4281): (gap junction protein alpha 8) This gene encodes a transmembrane connexin protein that is necessary for lens growth and maturation of lens fiber cells. The encoded protein is a component of gap junction channels and functions in a calcium and pH-dependent manner. Mutations in this gene have been associated with zonular pulverulent cataracts, nuclear progressive cataracts, and cataract-microcornea syndrome. [provided by RefSeq, Dec 2009]

GJA8 Gene-Disease associations (from GenCC):

• cataract 1 multiple types

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
• cataract - microcornea syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• early-onset nuclear cataract

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• early-onset sutural cataract

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• pulverulent cataract

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• total early-onset cataract

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 49 curated pathogenic missense variants (we use a threshold of 10). The gene has 13 curated benign missense variants. Trascript score misZ: -0.35816 (below the threshold of 3.09). GenCC associations: The gene is linked to cataract 1 multiple types, early-onset sutural cataract, pulverulent cataract, total early-onset cataract, early-onset nuclear cataract, cataract - microcornea syndrome.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.859

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005267.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GJA8	NM_005267.5	MANE Select	c.827C>T	p.Ser276Phe	missense	Exon 2 of 2	NP_005258.2	P48165

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GJA8	ENST00000369235.2	TSL:6 MANE Select	c.827C>T	p.Ser276Phe	missense	Exon 2 of 2	ENSP00000358238.1	P48165

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 36

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	1	-	Cataract 1 multiple types (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.30
BayesDel_addAF	Uncertain	0.15	D
BayesDel_noAF	Uncertain	-0.020
CADD	Benign	22
DANN	Uncertain	0.98
DEOGEN2	Benign	0.31	T
Eigen	Benign	-0.16
Eigen_PC	Benign	0.018
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.86	D
M_CAP	Benign	0.056	D
MetaRNN	Pathogenic	0.86	D
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	1.4	L
PhyloP100		5.9
PrimateAI	Uncertain	0.73	T
PROVEAN	Benign	-1.3	N
REVEL	Uncertain	0.49
Sift	Benign	0.19	T
Sift4G	Benign	0.066	T
Varity_R		0.15
gMVP		0.59
Mutation Taster		=11/89	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs45619342;

hg19: chr1-147380909;

COSMIC: COSV53790822;