chr9-34645685-CT-C

Position:

• chr9-34645685-CT-C

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP6_Moderate BS1 BS2

The ENST00000605275.1(GALT):​n.209-976del variant causes a intron, non coding transcript change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00571 in 137,498 control chromosomes in the GnomAD database, including 5 homozygotes. Variant has been reported in ClinVar as Benign (★).

• Frequency: Genomes: 𝑓 0.0057 (5 hom., cov: 27)
• Consequence: GALT ENST00000605275.1 intron, non_coding_transcript
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.520

Genes affected

GALT (HGNC:4135): (galactose-1-phosphate uridylyltransferase) Galactose-1-phosphate uridyl transferase (GALT) catalyzes the second step of the Leloir pathway of galactose metabolism, namely the conversion of UDP-glucose + galactose-1-phosphate to glucose-1-phosphate + UDP-galactose. The absence of this enzyme results in classic galactosemia in humans and can be fatal in the newborn period if lactose is not removed from the diet. The pathophysiology of galactosemia has not been clearly defined. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Apr 2012]

ACMG classification

Verdict is Benign. Variant got -10 ACMG points.

• BP6: Variant 9-34645685-CT-C is Benign according to our data. Variant chr9-34645685-CT-C is described in ClinVar as [Benign]. Clinvar id is 1698652.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00571 (785/137498) while in subpopulation AFR AF= 0.0167 (614/36710). AF 95% confidence interval is 0.0156. There are 5 homozygotes in gnomad4. There are 377 alleles in male gnomad4 subpopulation. Median coverage is 27. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 5 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GALT	ENST00000605275.1	n.209-976del		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes AF: 0.00567 AC: 780 AN: 137492 Hom.: 5 Cov.: 27

Gnomad AFR AF: 0.0166

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00320

Gnomad ASJ AF: 0.000306

Gnomad EAS AF: 0.00250

Gnomad SAS AF: 0.00163

Gnomad FIN AF: 0.00506

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000925

Gnomad OTH AF: 0.00380

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.00571 AC: 785 AN: 137498 Hom.: 5 Cov.: 27 AF XY: 0.00569 AC XY: 377 AN XY: 66298

Gnomad4 AFR AF: 0.0167

Gnomad4 AMR AF: 0.00320

Gnomad4 ASJ AF: 0.000306

Gnomad4 EAS AF: 0.00251

Gnomad4 SAS AF: 0.00163

Gnomad4 FIN AF: 0.00506

Gnomad4 NFE AF: 0.000925

Gnomad4 OTH AF: 0.00431

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

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

Jun 29, 2022

Variant summary: GALT c.-1004delT is located in the untranscribed region upstream of the GALT gene region. The variant allele was found at a frequency of 0.0088 in 23774 control chromosomes (gnomAD). The observed variant frequency is approximately 3 fold of the estimated maximal expected allele frequency for a pathogenic variant in GALT causing Galactosemia phenotype (0.0029), strongly suggesting that the variant is benign. To our knowledge, no occurrence of c.-1004delT in individuals affected with Galactosemia and no experimental evidence demonstrating its impact on protein function have been reported. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as benign. -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs201344398; hg19: chr9-34645682;