rs28934595

Positions:

• chr6-26091354-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_000410.4(HFE):​c.381A>C​(p.Gln127His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000041 in 1,461,888 control chromosomes in the GnomAD database, with no homozygous occurrence. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: HFE NM_000410.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: -0.921

Genes affected

HFE (HGNC:4886): (homeostatic iron regulator) The protein encoded by this gene is a membrane protein that is similar to MHC class I-type proteins and associates with beta2-microglobulin (beta2M). It is thought that this protein functions to regulate iron absorption by regulating the interaction of the transferrin receptor with transferrin. The iron storage disorder, hereditary haemochromatosis, is a recessive genetic disorder that results from defects in this gene. [provided by RefSeq, May 2022]

H2BC4 (HGNC:4757): (H2B clustered histone 4) Histones are basic nuclear proteins that are responsible for the nucleosome structure of the chromosomal fiber in eukaryotes. Two molecules of each of the four core histones (H2A, H2B, H3, and H4) form an octamer, around which approximately 146 bp of DNA is wrapped in repeating units, called nucleosomes. The linker histone, H1, interacts with linker DNA between nucleosomes and functions in the compaction of chromatin into higher order structures. The protein has antibacterial and antifungal antimicrobial activity. The main transcript variant of this gene is intronless and encodes a replication-dependent histone that is a member of the histone H2B family. This transcript variant lacks a polyA tail but instead contains a palindromic termination element. This gene is found in the large histone gene cluster on chromosome 6. [provided by RefSeq, Apr 2020]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
HFE	NM_000410.4	c.381A>C	p.Gln127His	missense_variant	3/6	ENST00000357618.10	NP_000401.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HFE	ENST00000357618.10	c.381A>C	p.Gln127His	missense_variant	3/6	1	NM_000410.4	ENSP00000417404	P3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000410 AC: 6 AN: 1461888 Hom.: 0 Cov.: 33 AF XY: 0.00000550 AC XY: 4 AN XY: 727246

Gnomad4 AFR exome AF: 0.00

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: 0.00000360

Gnomad4 OTH exome AF: 0.0000331

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hemochromatosis type 1 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Aug 01, 1999

- -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Aug 08, 2024

Variant summary: HFE c.381A>C (p.Gln127His) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a benign effect of the variant on protein function. The variant was absent in 251422 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.381A>C has been reported in the literature in a compound heterozygous individual affected with Hemochromatosis Type 1 (de Villiers_1999). These data do not allow any conclusion about variant significance. 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: 10401000). ClinVar contains an entry for this variant (Variation ID: 17). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Uncertain	0.082	D
BayesDel_noAF	Benign	-0.12
CADD	Benign	0.061
DANN	Benign	0.79
DEOGEN2	Benign	0.093	.;.;T;T;.;.;T
Eigen	Benign	-1.4
Eigen_PC	Benign	-1.4
FATHMM_MKL	Benign	0.028	N
LIST_S2	Benign	0.72	T;T;T;T;T;T;T
M_CAP	Benign	0.056	D
MetaRNN	Uncertain	0.67	D;D;D;D;D;D;D
MetaSVM	Benign	-0.82	T
MutationAssessor	Benign	0.90	.;.;L;.;L;.;.
MutationTaster	Benign	4.1e-9	A;A;A;A;A;A;A;A;A;A;A
PrimateAI	Benign	0.22	T
PROVEAN	Benign	-0.51	N;N;N;N;N;N;N
REVEL	Uncertain	0.38
Sift	Benign	0.36	T;T;T;T;T;T;T
Sift4G	Benign	0.58	T;T;T;T;T;T;T
Polyphen		0.0060	B;B;B;B;B;B;.
Vest4		0.17
MutPred		0.82		.;.;Gain of sheet (P = 0.1208);Gain of sheet (P = 0.1208);Gain of sheet (P = 0.1208);.;Gain of sheet (P = 0.1208);
MVP		0.73
MPC		0.22
ClinPred		0.057	T
GERP RS		-6.6
Varity_R		0.20
gMVP		0.79

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: rs28934595; hg19: chr6-26091582;