chr6-116877453-G-A

Position:

• chr6-116877453-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_173560.4(RFX6):​c.178G>A​(p.Gly60Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000702 in 1,423,752 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 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: 7.0e-7 (0 hom.)
• Consequence: RFX6 NM_173560.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.708

Genes affected

RFX6 (HGNC:21478): (regulatory factor X6) The nuclear protein encoded by this gene is a member of the regulatory factor X (RFX) family of transcription factors. Studies in mice suggest that this gene is specifically required for the differentiation of islet cells for the production of insulin, but not for the differentiation of pancreatic polypeptide-producing cells. It regulates the transcription factors involved in beta-cell maturation and function, thus, restricting the expression of the beta-cell differentiation and specification genes. Mutations in this gene are associated with Mitchell-Riley syndrome, which is characterized by neonatal diabetes with pancreatic hypoplasia, duodenal and jejunal atresia, and gall bladder agenesis.[provided by RefSeq, Sep 2010]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06371462).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RFX6	NM_173560.4	c.178G>A	p.Gly60Arg	missense_variant	1/19	ENST00000332958.3
RFX6	XM_011535589.2	c.178G>A	p.Gly60Arg	missense_variant	1/18

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RFX6	ENST00000332958.3	c.178G>A	p.Gly60Arg	missense_variant	1/19	1	NM_173560.4	P1
RFX6	ENST00000487683.5	n.242G>A		non_coding_transcript_exon_variant	1/14	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.02e-7 AC: 1 AN: 1423752 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 704186

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000254

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

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 16, 2024

The c.178G>A (p.G60R) alteration is located in exon 1 (coding exon 1) of the RFX6 gene. This alteration results from a G to A substitution at nucleotide position 178, causing the glycine (G) at amino acid position 60 to be replaced by an arginine (R). 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	Benign	0.071
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.57
CADD	Benign	6.5
DANN	Benign	0.91
DEOGEN2	Benign	0.14	T
Eigen	Benign	-1.0
Eigen_PC	Benign	-0.95
FATHMM_MKL	Benign	0.063	N
LIST_S2	Benign	0.47	T
M_CAP	Benign	0.0084	T
MetaRNN	Benign	0.064	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.55	N
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.36	T
PROVEAN	Benign	0.26	N
REVEL	Benign	0.079
Sift	Benign	0.28	T
Sift4G	Benign	0.37	T
Polyphen		0.0020	B
Vest4		0.15
MutPred		0.20		Loss of glycosylation at K62 (P = 0.1036);
MVP		0.14
MPC		0.59
ClinPred		0.071	T
GERP RS		2.6
Varity_R		0.030
gMVP		0.14

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: rs1478549070; hg19: chr6-117198616;