chr20-44355806-T-A

Position:

• chr20-44355806-T-A

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PVS1_Strong PP4_Moderate PM2_Supporting

This summary comes from the ClinGen Evidence Repository: The c.2T>A variant in the hepatocyte nuclear factor 4-alpha gene, HNF4A, results in the loss of the initiation codon (p.Met1?) of NM_175914.5. By altering the start codon of the coding sequence, this variant may cause a truncated or absent protein in a gene in which loss-of-function is an established disease mechanism (PVS1_Strong; PMID:23348805).This variant is absent from gnomAD v2.1.1 (PM2_Supporting). This variant was identified in an individual with a phenotype highly specific for HNF4A-monogenic diabetes (MPC > 50% and had a macrosomic infant with the variant with diazoxide-responsive hyperinsulinemic hypoglycemia (PP4_Moderate; Internal lab contributor). In summary, c.2T>A meets the criteria to be classified as Likely Pathogenic for monogenic diabetes. ACMG/AMP criteria applied, as specified by the ClinGen MDEP (specification version 2.0.0, approved 10/11/2023): PVS1_Strong, PP4_Moderate, PM2_Supporting. LINK:https://erepo.genome.network/evrepo/ui/classification/CA409109839/MONDO:0015967/085

• Frequency: Genomes: not found (cov: 32)
• Consequence: HNF4A NM_175914.5 start_lost
• Clinical Significance: Likely pathogenic reviewed by expert panel P:1
• Conservation: PhyloP100: 4.66

Genes affected

HNF4A (HGNC:5024): (hepatocyte nuclear factor 4 alpha) The protein encoded by this gene is a nuclear transcription factor which binds DNA as a homodimer. The encoded protein controls the expression of several genes, including hepatocyte nuclear factor 1 alpha, a transcription factor which regulates the expression of several hepatic genes. This gene may play a role in development of the liver, kidney, and intestines. Mutations in this gene have been associated with monogenic autosomal dominant non-insulin-dependent diabetes mellitus type I. Alternative splicing of this gene results in multiple transcript variants encoding several different isoforms. [provided by RefSeq, Apr 2012]

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

• PVS1: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PP4: For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HNF4A	NM_175914.5	c.2T>A	p.Met1?	start_lost	1/10	ENST00000316673.9	NP_787110.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HNF4A	ENST00000316673.9	c.2T>A	p.Met1?	start_lost	1/10	1	NM_175914.5	ENSP00000315180
HNF4A	ENST00000457232.5	c.2T>A	p.Met1?	start_lost	1/10	1		ENSP00000396216
HNF4A	ENST00000609795.5	c.2T>A	p.Met1?	start_lost	1/8	1		ENSP00000476609
HNF4A	ENST00000609262.5	c.-230T>A		5_prime_UTR_variant	1/4	1		ENSP00000476310

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: reviewed by expert panel

Submissions by phenotype

Monogenic diabetes Pathogenic:1

Likely pathogenic, reviewed by expert panel

curation

ClinGen Monogenic Diabetes Variant Curation Expert Panel

Jun 09, 2024

The c.2T>A variant in the hepatocyte nuclear factor 4-alpha gene, HNF4A, results in the loss of the initiation codon (p.Met1?) of NM_175914.5. By altering the start codon of the coding sequence, this variant may cause a truncated or absent protein in a gene in which loss-of-function is an established disease mechanism (PVS1_Strong; PMID: 23348805).This variant is absent from gnomAD v2.1.1 (PM2_Supporting). This variant was identified in an individual with a phenotype highly specific for HNF4A-monogenic diabetes (MPC > 50% and had a macrosomic infant with the variant with diazoxide-responsive hyperinsulinemic hypoglycemia (PP4_Moderate; Internal lab contributor). In summary, c.2T>A meets the criteria to be classified as Likely Pathogenic for monogenic diabetes. ACMG/AMP criteria applied, as specified by the ClinGen MDEP (specification version 2.0.0, approved 10/11/2023): PVS1_Strong, PP4_Moderate, PM2_Supporting. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.060
CADD	Uncertain	23
DANN	Benign	0.97
Eigen	Uncertain	0.41
Eigen_PC	Uncertain	0.44
FATHMM_MKL	Uncertain	0.77	D
LIST_S2	Uncertain	0.90	D;D;D
M_CAP	Pathogenic	0.96	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Pathogenic	0.83	D
MutationTaster	Benign	1.0	D;D
PROVEAN	Benign	0.27	N;.;N
REVEL	Uncertain	0.58
Sift	Pathogenic	0.0	D;.;D
Sift4G	Uncertain	0.028	D;D;D
Polyphen		0.81, 0.60	.;P;P
Vest4		0.96
MutPred		0.98		Loss of stability (P = 0.019);Loss of stability (P = 0.019);Loss of stability (P = 0.019);
MVP		0.81
ClinPred		0.83	D
GERP RS		5.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6

Splicing

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: chr20-42984446;