Non-syndromic hypotrichosis

Gene: LSS

Green List (high evidence)

Comment on list classification: After consultation with Genomics England clinicians, promoting this gene from red to green as there are > 3 cases (some syndromic, some non-syndromic).

Created: 12 Jan 2021, 8:52 p.m. | Last Modified: 12 Jan 2021, 8:52 p.m.

Panel Version: 1.6

Associated with Hypotrichosis 14 618275 (AR) in OMIM.

PMID: 32101538 - Wada et al 2020 - report two siblings from a nonconsanguineous Japanese family with novel biallelic LSS mutations (compound het) who presented congenital hypotrichosis, midline anomalies, such as cleft palate and agenesis of the corpus callosum, and no cataracts. The motor and mental development of the patients were normal. They also created tissue specific knock-out mice as Lss constitutive knockout mice are embryonically lethal, and found epidermis-specific knockout of Lss caused hypotrichosis, lens-specific Lss knockout mice had cataracts.

PMID: 30723320 - Besnard et al 2019 - report 7 unrelated families (11 individuals) with variants in LSS who present with alopecia (11/11), intellectual disability (10 mod/severe, 1 mild) and epilepsy (7/11). Segregation data shown for 6 families.

PMID: 30401459 - Romano et al 2018 - report 3 unrelated (Arabic, Swiss, Afgan origin) families with potentially autosomal-recessive Hypotrichosis simplex in which they identify by WES 5 five different missense and nonsense mutations in LSS. Variants were shown to segregate with the disorder in 2 families (DNA not available for the third). In one family the siblings also presented with intellectual disability but the authors consider this coincidental. No other phenotypes such as cataracts were reported.

PMID: 29016354 - Chen and Lui 2017 - report a pediatric patient with congenital cataract, small penis, baldness and absence of eyebrows and compound heterozygous variants in LSS.

Sources: Literature

Created: 23 Dec 2020, 1:11 p.m. | Last Modified: 23 Dec 2020, 1:52 p.m.

Panel Version: 1.5

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
Hypotrichosis 14 OMIM:618275; hypotrichosis 14 MONDO:0032649

Publications

• 32101538
• 30401459
• 30723320
• 29016354