rs995386735

Variant names:

• chr14-54842959-C-T
• rs995386735
• NM_000161.3:c.*1058G>A

Your query was ambiguous. Multiple possible variants found:

• chr14-54842959-C-T
• chr14-54842959-C-A

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BP4_Strong BS1

The NM_000161.3(GCH1):​c.*1058G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000053 in 717,122 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000040 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000056 (0 hom.)
• Consequence: GCH1 NM_000161.3 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:2
• Conservation: PhyloP100: -3.70
• Publications: 0 publications found

Genes affected

GCH1 (HGNC:4193): (GTP cyclohydrolase 1) This gene encodes a member of the GTP cyclohydrolase family. The encoded protein is the first and rate-limiting enzyme in tetrahydrobiopterin (BH4) biosynthesis, catalyzing the conversion of GTP into 7,8-dihydroneopterin triphosphate. BH4 is an essential cofactor required by aromatic amino acid hydroxylases as well as nitric oxide synthases. Mutations in this gene are associated with malignant hyperphenylalaninemia and dopa-responsive dystonia. Several alternatively spliced transcript variants encoding different isoforms have been described; however, not all variants give rise to a functional enzyme. [provided by RefSeq, Jul 2008]

GCH1 Gene-Disease associations (from GenCC):

• dystonia 5

  Inheritance: AD, AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet, Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• GTP cyclohydrolase I deficiency with hyperphenylalaninemia

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Genomics England PanelApp, Orphanet, Labcorp Genetics (formerly Invitae)
• GTP cyclohydrolase I deficiency

  Inheritance: SD, AD Classification: DEFINITIVE Submitted by: ClinGen, Illumina

ACMG classification

Our verdict: Benign. The variant received -8 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).
• BS1: Variant frequency is greater than expected in population eas. GnomAd4 allele frequency = 0.00004 (6/150062) while in subpopulation EAS AF = 0.000385 (2/5200). AF 95% confidence interval is 0.0000681. There are 0 homozygotes in GnomAd4. There are 3 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000161.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GCH1	NM_000161.3	MANE Select	c.*1058G>A		3_prime_UTR	Exon 6 of 6	NP_000152.1	P30793-1
	GCH1	NM_001024024.2		c.*112G>A		3_prime_UTR	Exon 7 of 7	NP_001019195.1	P30793-1
	GCH1	NM_001024070.2		c.*108G>A		3_prime_UTR	Exon 7 of 7	NP_001019241.1	P30793-4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GCH1	ENST00000491895.7	TSL:1 MANE Select	c.*1058G>A		3_prime_UTR	Exon 6 of 6	ENSP00000419045.2	P30793-1
	GCH1	ENST00000395514.5	TSL:1	c.*112G>A		3_prime_UTR	Exon 7 of 7	ENSP00000378890.1	P30793-1
	GCH1	ENST00000543643.6	TSL:1	c.*108G>A		3_prime_UTR	Exon 7 of 7	ENSP00000444011.2	P30793-4

Frequencies

GnomAD3 genomes AF: 0.0000400 AC: 6 AN: 150062 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000761

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000385

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.0000564 AC: 32 AN: 567060 Hom.: 0 Cov.: 5 AF XY: 0.0000522 AC XY: 16 AN XY: 306532

African (AFR) AF: 0.0000656 AC: 1 AN: 15234

American (AMR) AF: 0.0000623 AC: 2 AN: 32124

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 18996

East Asian (EAS) AF: 0.000523 AC: 18 AN: 34420

South Asian (SAS) AF: 0.00 AC: 0 AN: 57116

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50654

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3936

European-Non Finnish (NFE) AF: 0.0000309 AC: 10 AN: 323936

Other (OTH) AF: 0.0000326 AC: 1 AN: 30644

GnomAD4 genome AF: 0.0000400 AC: 6 AN: 150062 Hom.: 0 Cov.: 32 AF XY: 0.0000409 AC XY: 3 AN XY: 73330

African (AFR) AF: 0.0000761 AC: 3 AN: 39416

American (AMR) AF: 0.00 AC: 0 AN: 15212

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.000385 AC: 2 AN: 5200

South Asian (SAS) AF: 0.00 AC: 0 AN: 4828

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10610

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 314

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68026

Other (OTH) AF: 0.00 AC: 0 AN: 2074

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Dystonia 5 (1)
-	1	-	GTP cyclohydrolase I deficiency (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	0.31
DANN	Benign	0.69
PhyloP100		-3.7

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

Other links and lift over

dbSNP: rs995386735; hg19: chr14-55309677;