rs151256267

Positions:

Variant summary

Our verdict is Uncertain significance. Variant got -2 ACMG points: 2P and 4B. BS2PP1PP4

This summary comes from the ClinGen Evidence Repository: The c.871C>A variant in the HNF1 homeobox A gene, HNF1A, causes an amino acid change of proline to threonine at codon 291 (p.(Pro291Thr)) of NM_000545.8. This variant segregated with diabetes, with three informative meioses in one families with MODY (PP1; PMID:22432108). Additionally, this variant was identified in a normoglycemic individual >70 years old, and the expected penetrance for HNF1A-MODY is 95% by age 70 (BS2; internal lab contributor). Lastly, the c.871C>A variant was identified in an individual with a clinical history highly specific for HNF1A-MODY (MODY probability calculator result >50%, negative genetic testing for HNF4A) (PP4; PMID:18003757. In summary, c.871C>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 1.1, approved 6/4/2021): BS2, PP4, PP1 LINK:https://erepo.genome.network/evrepo/ui/classification/CA6831857/MONDO:0015967/017

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000089 ( 0 hom. )

Consequence

HNF1A
NM_000545.8 missense

Scores

Clinical Significance

Uncertain significance reviewed by expert panel U:4

Conservation

PhyloP100: 0.661

Variant links:

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 links:

HNF1A (HGNC:):

HNF1A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got -2 ACMG points.

PP1

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

PP4

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

BS2

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HNF1A	NM_000545.8 linkuse as main transcript	c.871C>A	p.Pro291Thr	missense_variant	4/10	ENST00000257555.11	NP_000536.6	P20823E0YMI7
HNF1A	NM_001306179.2 linkuse as main transcript	c.871C>A	p.Pro291Thr	missense_variant	4/10		NP_001293108.2	P20823E0YMI7
HNF1A	NM_001406915.1 linkuse as main transcript	c.871C>A	p.Pro291Thr	missense_variant	4/9		NP_001393844.1
HNF1A	XM_024449168.2 linkuse as main transcript	c.871C>A	p.Pro291Thr	missense_variant	4/9		XP_024304936.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HNF1A	ENST00000257555.11 linkuse as main transcript	c.871C>A	p.Pro291Thr	missense_variant	4/10	1	NM_000545.8	ENSP00000257555.5		A0A0A0MQU7

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152216

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000125

AC:

AN:

239706

Hom.:

AF XY:

0.0000154

AC XY:

AN XY:

130220

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000599

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000923

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000892

AC:

AN:

1457718

Hom.:

Cov.:

AF XY:

0.00000690

AC XY:

AN XY:

724894

show subpopulations

Gnomad4 AFR exome

AF:

0.0000598

Gnomad4 AMR exome

AF:

0.0000456

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:

0.00000810

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152216

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74354

show subpopulations

Gnomad4 AFR

AF:

0.0000483

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Diabetes mellitus type 1;C0011860:Type 2 diabetes mellitus;C1838100:Maturity-onset diabetes of the young type 3;C1840646:Hepatic adenomas, familial;C2675866:Type 1 diabetes mellitus 20;CN074294:Nonpapillary renal cell carcinoma

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Nov 18, 2021

- -

Monogenic diabetes

Uncertain:1

Uncertain significance, reviewed by expert panel

curation

ClinGen Monogenic Diabetes Variant Curation Expert Panel

Dec 30, 2021

The c.871C>A variant in the HNF1 homeobox A gene, HNF1A, causes an amino acid change of proline to threonine at codon 291 (p.(Pro291Thr)) of NM_000545.8. This variant segregated with diabetes, with three informative meioses in one families with MODY (PP1; PMID: 22432108). Additionally, this variant was identified in a normoglycemic individual >70 years old, and the expected penetrance for HNF1A-MODY is 95% by age 70 (BS2; internal lab contributor). Lastly, the c.871C>A variant was identified in an individual with a clinical history highly specific for HNF1A-MODY (MODY probability calculator result >50%, negative genetic testing for HNF4A) (PP4; PMID: 18003757. In summary, c.871C>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 1.1, approved 6/4/2021): BS2, PP4, PP1 -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Apr 15, 2022

This sequence change replaces proline, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 291 of the HNF1A protein (p.Pro291Thr). This variant is present in population databases (rs151256267, gnomAD 0.003%). This missense change has been observed in individual(s) with maturity-onset diabetes of the young (PMID: 18003757, 30455330). ClinVar contains an entry for this variant (Variation ID: 972814). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt HNF1A protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Maturity-onset diabetes of the young type 3

Uncertain:1

Uncertain significance, criteria provided, single submitter

curation

Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard

Jan 22, 2020

The p.Pro291Thr variant in HNF1A has been reported in at least 2 European individuals with maturity-onset diabetes of the young (PMID: 18003757, 30455330), and has been identified in 0.006% (2/33380) of Latino chromosomes and 0.0009% (1/108298) of European (non-Finnish) chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org; dbSNP rs151256267). Please note that for diseases with clinical variability, or reduced penetrance, pathogenic variants may be present at a low frequency in the general population. In vitro functional studies provide some evidence that the p.Pro291Thr variant may slightly impact protein function (PMID: 30455330). However, these types of assays may not accurately represent biological function. Computational prediction tools and conservation analyses do not provide strong support for or against an impact to the protein. In summary, while there is some suspicion for a pathogenic role, the clinical significance of this variant is uncertain. ACMG/AMP Criteria applied: PS4_Supporting, PS3_Supporting (Richards 2015). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.056

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Uncertain

0.070

CADD

Benign

3.6

DANN

Benign

0.21

DEOGEN2

Benign

0.41

.;T;T;.

Eigen

Benign

-1.0

Eigen_PC

Benign

-1.0

FATHMM_MKL

Benign

0.25

LIST_S2

Benign

0.86

D;D;D;D

M_CAP

Uncertain

0.20

MetaRNN

Benign

0.36

T;T;T;T

MetaSVM

Uncertain

-0.16

PrimateAI

Benign

0.48

PROVEAN

Benign

0.47

N;.;N;N

REVEL

Uncertain

0.59

Sift

Benign

0.60

T;.;T;T

Sift4G

Benign

0.52

T;T;T;T

Polyphen

0.014

.;.;.;B

Vest4

0.49

MutPred

0.65

Gain of phosphorylation at P291 (P = 0.0035);Gain of phosphorylation at P291 (P = 0.0035);Gain of phosphorylation at P291 (P = 0.0035);Gain of phosphorylation at P291 (P = 0.0035);

MVP

0.96

MPC

0.13

ClinPred

0.026

GERP RS

1.6

gMVP

0.50

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over