8-25421632-G-A

Position:

• chr8-25421632-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001083111.2(GNRH1):​c.178C>T​(p.Arg60Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000424 in 1,605,392 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000066 (0 hom., cov: 31)
  • Exomes 𝑓: 0.000040 (0 hom.)
• Consequence: GNRH1 NM_001083111.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.13

Genes affected

GNRH1 (HGNC:4419): (gonadotropin releasing hormone 1) This gene encodes a preproprotein that is proteolytically processed to generate a peptide that is a member of the gonadotropin-releasing hormone (GnRH) family of peptides. Alternative splicing results in multiple transcript variants, at least one of which is secreted and then cleaved to generate gonadoliberin-1 and GnRH-associated peptide 1. Gonadoliberin-1 stimulates the release of luteinizing and follicle stimulating hormones, which are important for reproduction. Mutations in this gene are associated with hypogonadotropic hypogonadism. [provided by RefSeq, Nov 2015]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.016255677).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GNRH1	NM_001083111.2	c.178C>T	p.Arg60Cys	missense_variant	3/4	ENST00000421054.7	NP_001076580.1
GNRH1	NM_000825.3	c.190C>T	p.Arg64Cys	missense_variant	2/3		NP_000816.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GNRH1	ENST00000421054.7	c.178C>T	p.Arg60Cys	missense_variant	3/4	1	NM_001083111.2	ENSP00000391280.2
GNRH1	ENST00000276414.4	c.178C>T	p.Arg60Cys	missense_variant	2/3	1		ENSP00000276414.4

Frequencies

GnomAD3 genomes AF: 0.0000657 AC: 10 AN: 152126 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000377

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000844 AC: 21 AN: 248838 Hom.: 0 AF XY: 0.0000741 AC XY: 10 AN XY: 135006

Gnomad AFR exome AF: 0.000194

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000557

Gnomad SAS exome AF: 0.0000655

Gnomad FIN exome AF: 0.000650

Gnomad NFE exome AF: 0.00000887

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000399 AC: 58 AN: 1453150 Hom.: 0 Cov.: 28 AF XY: 0.0000442 AC XY: 32 AN XY: 723364

Gnomad4 AFR exome AF: 0.0000902

Gnomad4 AMR exome AF: 0.0000448

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.0000465

Gnomad4 FIN exome AF: 0.000600

Gnomad4 NFE exome AF: 0.0000127

Gnomad4 OTH exome AF: 0.0000334

GnomAD4 genome AF: 0.0000657 AC: 10 AN: 152242 Hom.: 0 Cov.: 31 AF XY: 0.0000940 AC XY: 7 AN XY: 74434

Gnomad4 AFR AF: 0.0000481

Gnomad4 AMR AF: 0.0000654

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.000377

Gnomad4 NFE AF: 0.0000441

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000282 Hom.: 0

Bravo AF: 0.0000302

ExAC AF: 0.0000413 AC: 5

EpiCase AF: 0.0000545

EpiControl AF: 0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 22, 2021

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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Not Available"; Align-GVGD: "Class C15"). This variant has not been reported in the literature in individuals affected with GNRH1-related conditions. This variant is present in population databases (rs574867408, ExAC 0.02%). This sequence change replaces arginine with cysteine at codon 64 of the GNRH1 protein (p.Arg64Cys). The arginine residue is weakly conserved and there is a large physicochemical difference between arginine and cysteine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.085
BayesDel_addAF	Benign	-0.48	T
BayesDel_noAF	Benign	-0.64
CADD	Benign	18
DANN	Benign	0.94
DEOGEN2	Benign	0.13	T;T
Eigen	Benign	-0.80
Eigen_PC	Benign	-0.85
FATHMM_MKL	Benign	0.095	N
LIST_S2	Benign	0.77	.;T
M_CAP	Benign	0.0086	T
MetaRNN	Benign	0.016	T;T
MetaSVM	Benign	-1.0	T
PrimateAI	Benign	0.23	T
PROVEAN	Benign	0.75	N;N
REVEL	Benign	0.077
Sift	Benign	0.10	T;T
Sift4G	Benign	0.20	T;T
Polyphen		0.0010	B;B
Vest4		0.18
MutPred		0.30		Loss of disorder (P = 0.0542);Loss of disorder (P = 0.0542);
MVP		0.11
MPC		0.26
ClinPred		0.024	T
GERP RS		2.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.063
gMVP		0.18

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: rs574867408; hg19: chr8-25279148;