NM_000545.8:c.1114G>A

Variant names:

• chr12-120996547-G-A
• rs587780356
• NM_000545.8:c.1114G>A

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

This summary comes from the ClinGen Evidence Repository: The c.1114G>A variant in the HNF1 homeobox A gene, HNF1A, causes an amino acid change of alanine to threonine at codon 372 (p.(Ala372Thr)) of NM_000545.8. This variant is absent from gnomAD v2.1.1 and v4.1 (PM2_Supporting). This variant has a REVEL score of 0.371, which is between the ClinGen MDEP thresholds for BP4 and PP3, predicting neither a damaging nor benign impact on HNF1A function. In summary, c.1114G>A meets the criteria to be classified as a variant of uncertain significance for monogenic diabetes. ACMG/AMP criteria applied, as specified by the ClinGen MDEP (specification version 2.1.0, approved 8/11/23): PM2_Supporting. LINK:https://erepo.genome.network/evrepo/ui/classification/CA231160/MONDO:0015967/017

• Frequency: Genomes: not found (cov: 32)
• Consequence: HNF1A NM_000545.8 missense
• Clinical Significance: Uncertain significance reviewed by expert panel U:2 O:1
• Conservation: PhyloP100: 5.55
• Publications: 2 publications found

Genes affected

HNF1A (HGNC:11621): (HNF1 homeobox A) The protein encoded by this gene is a transcription factor required for the expression of several liver-specific genes. The encoded protein functions as a homodimer and binds to the inverted palindrome 5'-GTTAATNATTAAC-3'. Defects in this gene are a cause of maturity onset diabetes of the young type 3 (MODY3) and also can result in the appearance of hepatic adenomas. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Apr 2015]

HNF1A Gene-Disease associations (from GenCC):

• monogenic diabetes

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• type 1 diabetes mellitus 20

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Laboratory for Molecular Medicine, Genomics England PanelApp
• diabetes mellitus, noninsulin-dependent

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• maturity-onset diabetes of the young type 3

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• hyperinsulinism due to HNF1A deficiency

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• maturity-onset diabetes of the young

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• nonpapillary renal cell carcinoma

  Inheritance: Unknown Classification: NO_KNOWN Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
HNF1A	NM_000545.8	c.1114G>A	p.Ala372Thr	missense_variant	Exon 6 of 10	ENST00000257555.11	NP_000536.6
HNF1A	NM_001306179.2	c.1114G>A	p.Ala372Thr	missense_variant	Exon 6 of 10		NP_001293108.2
HNF1A	NM_001406915.1	c.1114G>A	p.Ala372Thr	missense_variant	Exon 6 of 9		NP_001393844.1
HNF1A	XM_024449168.2	c.1114G>A	p.Ala372Thr	missense_variant	Exon 6 of 9		XP_024304936.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
HNF1A	ENST00000257555.11	c.1114G>A	p.Ala372Thr	missense_variant	Exon 6 of 10	1	NM_000545.8	ENSP00000257555.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 35

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2 Other:1

Revision: reviewed by expert panel

Submissions by phenotype

Monogenic diabetes Uncertain:1

Apr 11, 2025

ClinGen Monogenic Diabetes Variant Curation Expert Panel

Significance: Uncertain significance

Review Status: reviewed by expert panel

Collection Method: curation

The c.1114G>A variant in the HNF1 homeobox A gene, HNF1A, causes an amino acid change of alanine to threonine at codon 372 (p.(Ala372Thr)) of NM_000545.8. This variant is absent from gnomAD v2.1.1 and v4.1 (PM2_Supporting). This variant has a REVEL score of 0.371, which is between the ClinGen MDEP thresholds for BP4 and PP3, predicting neither a damaging nor benign impact on HNF1A function. In summary, c.1114G>A meets the criteria to be classified as a variant of uncertain significance for monogenic diabetes. ACMG/AMP criteria applied, as specified by the ClinGen MDEP (specification version 2.1.0, approved 8/11/23): PM2_Supporting. -

not provided Uncertain:1

Jan 17, 2013

Genetic Services Laboratory, University of Chicago

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Maturity onset diabetes mellitus in young Other:1

-

Clinical Genomics, Uppaluri K&H Personalized Medicine Clinic

Significance: Uncertain risk allele

Review Status: criteria provided, single submitter

Collection Method: research

Mutations in HNF1A gene can predispose to MODY3. It is associated with both micro and macrovascular complications of diabetes, especially cardiovascular complications. Associated with glucosuria. May respond well to sulfonylureas. However, more evidence is required to confer the association of this particular variant rs587780356 with MODY3. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.067
BayesDel_addAF	Uncertain	0.027	T
BayesDel_noAF	Benign	-0.20
CADD	Benign	20
DANN	Benign	0.93
DEOGEN2	Uncertain	0.43	.;T;T;.
Eigen	Benign	-0.34
Eigen_PC	Benign	-0.28
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Benign	0.82	T;T;T;T
M_CAP	Uncertain	0.19	D
MetaRNN	Benign	0.27	T;T;T;T
MetaSVM	Uncertain	0.00020	D
PhyloP100		5.6
PrimateAI	Uncertain	0.57	T
PROVEAN	Benign	-0.67	N;.;N;N
REVEL	Uncertain	0.37
Sift	Benign	0.36	T;.;T;T
Sift4G	Benign	0.35	T;T;T;T
Polyphen		0.36	.;.;.;B
Vest4		0.34
MutPred		0.38		Gain of glycosylation at A372 (P = 0.0257);Gain of glycosylation at A372 (P = 0.0257);Gain of glycosylation at A372 (P = 0.0257);Gain of glycosylation at A372 (P = 0.0257);
MVP		0.76
MPC		0.14
ClinPred		0.34	T
GERP RS		3.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
gMVP		0.59
Mutation Taster		=73/27	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.13		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs587780356; hg19: chr12-121434350;