12-120994321-C-G

Position:

chr12-120994321-C-G

Variant summary

Our verdict is Uncertain significance. Variant got -1 ACMG points: 4P and 5B. PS4_ModerateBP2PP4BS2PM2_Supporting

This summary comes from the ClinGen Evidence Repository: The c.871C>G variant in the HNF1 homeobox A gene, HNF1A, causes an amino acid change of proline to alanine at codon 291 (p.(Pro291Ala)) of NM_000545.8. This variant was identified in 4 unrelated individuals with non- autoimmune and non-absolute/near-absolute insulin-deficient diabetes (PS4_Moderate; internal lab contributors). Also, this variant has a minor allele frequency of 0.000009234 in the gnomAD v2.1.1 European non-Finnish population which is less than the ClinGen MDEP threshold for PM2_Supporting (≤0.00002 and ≤1 copy in any other subpopulation) (PM2_Supporting). This 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; internal lab contributors). Additionally, this variant was identified in a patient with different HNF1A variant curated by MDEP as pathogenic (BP2; internal lab contributors). 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 contributors). This variant has a REVEL score of 0.28, which is between the ClinGen MDEP thresholds, predicting neither a damaging nor benign impact on HNF1A function. In summary, c.871C>G 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 9/30/2021): PS4_Moderate, PM2_Supporting, PP4, BP5, BS2 LINK:https://erepo.genome.network/evrepo/ui/classification/CA244533124/MONDO:0007453/017

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000010 ( 0 hom. )

Consequence

HNF1A
NM_000545.8 missense

Scores

1

3

14

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got -1 ACMG points.

PS4

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.

BP2

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 link	c.871C>G	p.Pro291Ala	missense_variant	4/10	ENST00000257555.11	NP_000536.6	P20823E0YMI7
HNF1A	NM_001306179.2 link	c.871C>G	p.Pro291Ala	missense_variant	4/10		NP_001293108.2	P20823E0YMI7
HNF1A	NM_001406915.1 link	c.871C>G	p.Pro291Ala	missense_variant	4/9		NP_001393844.1
HNF1A	XM_024449168.2 link	c.871C>G	p.Pro291Ala	missense_variant	4/9		XP_024304936.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HNF1A	ENST00000257555.11 link	c.871C>G	p.Pro291Ala	missense_variant	4/10	1	NM_000545.8	ENSP00000257555.5		A0A0A0MQU7

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

2

AN:

152216

Hom.:

0

Cov.:

32

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000417

AC:

1

AN:

239706

Hom.:

0

AF XY:

0.00000768

AC XY:

1

AN XY:

130220

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

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:

0.0000103

AC:

15

AN:

1457718

Hom.:

0

Cov.:

35

AF XY:

0.0000138

AC XY:

10

AN XY:

724894

show subpopulations

Gnomad4 AFR exome

AF:

0.000209

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:

0.00000540

Gnomad4 OTH exome

AF:

0.0000332

GnomAD4 genome

AF:

0.0000197

AC:

3

AN:

152334

Hom.:

0

Cov.:

32

AF XY:

0.0000269

AC XY:

2

AN XY:

74482

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.0000653

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Jul 16, 2024

Variant summary: HNF1A c.871C>G (p.Pro291Ala) results in a non-conservative amino acid change located in the Hepatocyte nuclear factor 1, beta isoform, C-terminal domain (IPR006897) of the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 4.2e-06 in 239706 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.871C>G has been reported in the literature as heterozygous genotype in an individual affected with gestational diabetes (Daggag_2022). These report(s) do not provide unequivocal conclusions about association of the variant with Maturity Onset Diabetes Of The Young 3. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication have been ascertained in the context of this evaluation (PMID: 36407475). ClinVar contains an entry for this variant (Variation ID: 1334146). Based on the evidence outlined above, the variant was classified as uncertain significance. -

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

Dec 21, 2023

- -

Monogenic diabetes

Uncertain:1

Uncertain significance, reviewed by expert panel

curation

ClinGen Monogenic Diabetes Variant Curation Expert Panel

Jan 03, 2022

The c.871C>G variant in the HNF1 homeobox A gene, HNF1A, causes an amino acid change of proline to alanine at codon 291 (p.(Pro291Ala)) of NM_000545.8. This variant was identified in 4 unrelated individuals with non- autoimmune and non-absolute/near-absolute insulin-deficient diabetes (PS4_Moderate; internal lab contributors). Also, this variant has a minor allele frequency of 0.000009234 in the gnomAD v2.1.1 European non-Finnish population which is less than the ClinGen MDEP threshold for PM2_Supporting (≤0.00002 and ≤1 copy in any other subpopulation) (PM2_Supporting). This 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; internal lab contributors). Additionally, this variant was identified in a patient with different HNF1A variant curated by MDEP as pathogenic (BP2; internal lab contributors). 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 contributors). This variant has a REVEL score of 0.28, which is between the ClinGen MDEP thresholds, predicting neither a damaging nor benign impact on HNF1A function. In summary, c.871C>G 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): PS4_Moderate, PM2_Supporting, PP4, BP5, BS2 -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 28, 2021

This sequence change replaces proline with alanine at codon 291 of the HNF1A protein (p.Pro291Ala). The proline residue is moderately conserved and there is a small physicochemical difference between proline and alanine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals affected with HNF1A-related conditions. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.049

BayesDel_addAF

Uncertain

0.10

D

BayesDel_noAF

Benign

-0.090

CADD

Benign

6.1

DANN

Benign

0.93

DEOGEN2

Uncertain

0.45

.;T;T;.

Eigen

Benign

-0.88

Eigen_PC

Benign

-0.91

FATHMM_MKL

Benign

0.26

N

LIST_S2

Benign

0.76

T;T;T;T

M_CAP

Pathogenic

0.31

D

MetaRNN

Benign

0.21

T;T;T;T

MetaSVM

Uncertain

0.025

D

PrimateAI

Benign

0.47

T

PROVEAN

Benign

-0.60

N;.;N;N

REVEL

Benign

0.28

Sift

Benign

0.039

D;.;D;D

Sift4G

Benign

0.40

T;T;T;T

Polyphen

0.0060

.;.;.;B

Vest4

0.43

MutPred

0.51

Loss of glycosylation at P291 (P = 0.0054);Loss of glycosylation at P291 (P = 0.0054);Loss of glycosylation at P291 (P = 0.0054);Loss of glycosylation at P291 (P = 0.0054);

MVP

0.70

MPC

0.13

ClinPred

0.091

T

GERP RS

1.6

gMVP

0.45

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.

Other links and lift over

dbSNP: rs151256267; hg19: chr12-121432124;

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