chr18-22171970-G-A

Position:

• chr18-22171970-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_005257.6(GATA6):​c.826G>A​(p.Ala276Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: GATA6 NM_005257.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.177

Genes affected

GATA6 (HGNC:4174): (GATA binding protein 6) This gene is a member of a small family of zinc finger transcription factors that play an important role in the regulation of cellular differentiation and organogenesis during vertebrate development. This gene is expressed during early embryogenesis and localizes to endo- and mesodermally derived cells during later embryogenesis and thereby plays an important role in gut, lung, and heart development. Mutations in this gene are associated with several congenital defects. [provided by RefSeq, Mar 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.37231123).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GATA6	NM_005257.6	c.826G>A	p.Ala276Thr	missense_variant	2/7	ENST00000269216.10	NP_005248.2
GATA6	XM_047437483.1	c.826G>A	p.Ala276Thr	missense_variant	2/7		XP_047293439.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GATA6	ENST00000269216.10	c.826G>A	p.Ala276Thr	missense_variant	2/7	1	NM_005257.6	ENSP00000269216	P1
GATA6	ENST00000581694.1	c.826G>A	p.Ala276Thr	missense_variant	1/6	1		ENSP00000462313	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1058822 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 499620

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Atrioventricular septal defect 5 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 02, 2017

This sequence change replaces alanine with threonine at codon 276 of the GATA6 protein (p.Ala276Thr). The alanine residue is weakly conserved and there is a small physicochemical difference between alanine and threonine. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a GATA6-related disease. In summary, this variant is a novel missense change that is not predicted to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.083
BayesDel_addAF	Benign	0.0093	T
BayesDel_noAF	Benign	-0.22
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.74	D;D
Eigen	Benign	-0.71
Eigen_PC	Benign	-0.71
FATHMM_MKL	Benign	0.11	N
LIST_S2	Benign	0.54	.;T
M_CAP	Pathogenic	0.97	D
MetaRNN	Benign	0.37	T;T
MetaSVM	Uncertain	0.28	D
MutationAssessor	Benign	0.83	L;L
MutationTaster	Benign	0.58	N;N
PrimateAI	Pathogenic	0.90	D
PROVEAN	Benign	-0.65	N;.
REVEL	Benign	0.18
Sift	Benign	0.36	T;.
Sift4G	Benign	0.15	T;T
Polyphen		0.16	B;B
Vest4		0.045
MutPred		0.30		Gain of glycosylation at A276 (P = 0.0012);Gain of glycosylation at A276 (P = 0.0012);
MVP		0.89
ClinPred		0.12	T
GERP RS		1.6
Varity_R		0.056
gMVP		0.38

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: rs1555628811; hg19: chr18-19751931;