9-34645685-CTTTTTTT-CTTTTTTTTTTT

Variant names:

• chr9-34645685-C-CTTTT
• rs201344398
• ENST00000605275.1:n.209-992_209-991insTTTT

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The ENST00000605275.1(GALT):​n.209-992_209-991insTTTT variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000727 in 137,532 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.0000073 (0 hom., cov: 27)
• Consequence: GALT ENST00000605275.1 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.520
• Publications: 0 publications found

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]

GALT Gene-Disease associations (from GenCC):

• classic galactosemia

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Orphanet
• galactosemia

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen, Myriad Women’s Health

ENSG00000294190 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GALT	ENST00000605275.1	n.209-992_209-991insTTTT		intron_variant	Intron 1 of 1	3
ENSG00000294190	ENST00000721802.1	n.127-1072_127-1071insAAAA		intron_variant	Intron 1 of 2

Frequencies

GnomAD3 genomes AF: 0.00000727 AC: 1 AN: 137532 Hom.: 0 Cov.: 27

Gnomad AFR AF: 0.0000273

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

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

GnomAD4 genome AF: 0.00000727 AC: 1 AN: 137532 Hom.: 0 Cov.: 27 AF XY: 0.00 AC XY: 0 AN XY: 66296

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0000273 AC: 1 AN: 36668

American (AMR) AF: 0.00 AC: 0 AN: 13754

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3268

East Asian (EAS) AF: 0.00 AC: 0 AN: 4794

South Asian (SAS) AF: 0.00 AC: 0 AN: 4304

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 7914

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 286

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 63822

Other (OTH) AF: 0.00 AC: 0 AN: 1846

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.52

Splicing

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

Other links and lift over

dbSNP: rs201344398; hg19: chr9-34645682;